Biggest changeFinancial Results of Operations Year ended December 31, 2022, compared to the year ended December 31, 2021 The following table summarizes our results of operations for the periods presented (dollars in thousands): Year Ended December 31, Increase 2022 2021 (Decrease) Revenues: Contract operations $ 673,214 $ 609,450 10.5 % Parts and service 15,729 11,228 40.1 % Related party 15,655 11,967 30.8 % Total revenues 704,598 632,645 11.4 % Costs and expenses: Cost of operations, exclusive of depreciation and amortization 234,336 194,389 20.6 % Depreciation and amortization 236,677 238,769 (0.9) % Selling, general, and administrative 61,278 56,082 9.3 % Loss (gain) on disposition of assets 1,527 (2,588) * Impairment of compression equipment 1,487 5,121 (71.0) % Total costs and expenses 535,305 491,773 8.9 % Operating income 169,293 140,872 20.2 % Other income (expense): Interest expense, net (138,050) (129,826) 6.3 % Other 91 107 (15.0) % Total other expense (137,959) (129,719) 6.4 % Net income before income tax expense 31,334 11,153 180.9 % Income tax expense 1,016 874 16.2 % Net income $ 30,318 $ 10,279 195.0 % ________________________ * Not meaningful. 39 Table of Contents Contract operations revenue .
Biggest changeThe above-stated factors also drove the increase in average horsepower utilization based on revenue-generating horsepower and fleet horsepower for the year ended December 31, 2023 as compared to the year ended December 31, 2022. 39 Table of Contents Financial Results of Operations Year ended December 31, 2023, compared to the year ended December 31, 2022 The following table summarizes our results of operations for the periods presented (dollars in thousands): Year Ended December 31, Increase 2023 2022 (Decrease) Revenues: Contract operations $ 802,562 $ 673,214 19.2 % Parts and service 21,890 15,729 39.2 % Related party 21,726 15,655 38.8 % Total revenues 846,178 704,598 20.1 % Costs and expenses: Cost of operations, exclusive of depreciation and amortization 284,708 234,336 21.5 % Depreciation and amortization 246,096 236,677 4.0 % Selling, general, and administrative 72,714 61,278 18.7 % Loss (gain) on disposition of assets (1,667) 1,527 * Impairment of compression equipment 12,346 1,487 * Total costs and expenses 614,197 535,305 14.7 % Operating income 231,981 169,293 37.0 % Other income (expense): Interest expense, net (169,924) (138,050) 23.1 % Gain on derivative instrument 7,449 — * Other 127 91 39.6 % Total other expense (162,348) (137,959) 17.7 % Net income before income tax expense 69,633 31,334 122.2 % Income tax expense 1,365 1,016 34.4 % Net income $ 68,268 $ 30,318 125.2 % ________________________ * Not meaningful.
The remainder of unit-based compensation expense for all periods was related to non-cash adjustments to the unit-based compensation liability. (2) Represents certain expenses related to potential and completed transactions and other items. We believe it is useful to investors to exclude these expenses.
The remainder of unit-based compensation expense for all periods was related to non-cash adjustments to the unit-based compensation liability. (2) Represents certain expenses related to potential and completed transactions and other items. We believe it is useful to investors to exclude these expenses.
We believe DCF Coverage Ratio is an important measure of operating performance because it permits management, investors, and others to assess our ability to pay cash distributions to common unitholders out of the cash flows that we generate.
We believe DCF Coverage Ratio is an important measure of operating performance because it permits management, investors, and others to assess our ability to pay distributions to common unitholders out of the cash flows that we generate.
Additionally, average revenue per revenue-generating horsepower per month associated with our compression services provided on a month-to-month basis did not differ significantly from the average revenue per revenue-generating horsepower per month associated with our compression services provided under contracts in their primary term during the period. Parts and service revenue .
Average revenue per revenue-generating horsepower per month associated with our compression services provided on a month-to-month basis did not differ significantly from the average revenue per revenue-generating horsepower per month associated with our compression services provided under contracts in their primary term during the period. Parts and service revenue .
Interest on the Senior Notes 2026 is payable semi-annually in arrears on each of April 1 and October 1. The Senior Notes 2027 are due on September 1, 2027, and accrue interest at the rate of 6.875% per year. Interest on the Senior Notes 2027 is payable semi-annually in arrears on each of March 1 and September 1.
The Senior Notes 2026 are due on April 1, 2026, and accrue interest at the rate of 6.875% per year. Interest on the Senior Notes 2026 is payable semi-annually in arrears on each of April 1 and October 1. The Senior Notes 2027 are due on September 1, 2027, and accrue interest at the rate of 6.875% per year.
The primary circumstances supporting these impairments were: (i) unmarketability of units into the foreseeable future, (ii) excessive maintenance costs associated with certain fleet assets, and (iii) excessive retrofitting costs that likely would prevent certain units from securing customer acceptance. These compression units were written down to their respective estimated salvage values, if any.
The primary circumstances supporting these impairments were: (i) unmarketability of certain compression units into the foreseeable future, (ii) excessive maintenance costs associated with certain fleet assets, and (iii) prohibitive retrofitting costs that likely would prevent certain compression units from securing customer acceptance. These compression units were written down to their estimated salvage values, if any.
The primary circumstances supporting these impairments were: (i) unmarketability of units into the foreseeable future, (ii) excessive maintenance costs associated with certain fleet assets, and (iii) excessive retrofitting costs that likely would prevent certain units from securing customer acceptance. These compression units were written down to their respective estimated salvage values, if any.
The primary circumstances supporting these impairments were: (i) unmarketability of certain compression units into the foreseeable future, (ii) excessive maintenance costs associated with certain fleet assets, and (iii) prohibitive retrofitting costs that likely would prevent certain compression units from securing customer acceptance. These compression units were written down to their estimated salvage values, if any.
We evaluate the financial strength of our customers by reviewing the aging of their receivables owed to us, our collection experience with the customer, correspondence, financial information, and third-party credit ratings. We evaluate the business climate in which our customers operate by reviewing various publicly available materials regarding our customers’ industry, including the solvency of various companies in the industry.
We evaluate the financial strength of our customers by reviewing the aging of their receivables owed to us, our collection experiences with the customer, correspondence, financial information, and third-party credit ratings. We evaluate the business climate in which our customers operate by reviewing various publicly available materials regarding our customers’ industry, including the solvency of various companies in the industry.
Coverage Ratios DCF Coverage Ratio is defined as the period’s DCF divided by distributions declared to common unitholders in respect of such period.
DCF Coverage Ratio DCF Coverage Ratio is defined as the period’s DCF divided by distributions declared to common unitholders in respect of such period.
Such distributions are treated as non-cash transactions in the accompanying Consolidated Statements of Cash Flows included in Part II, Item 8 “Financial Statements and Supplementary Data” of this report. See Note 11 to our consolidated financial statements in Part II, Item 8 “Financial Statements and Supplementary Data” for more information regarding the DRIP.
Such distributions are treated as non-cash transactions in the accompanying Consolidated Statements of Cash Flows included in Part II, Item 8 “Financial Statements and Supplementary Data” of this report. See Note 12 to our consolidated financial statements in Part II, Item 8 “Financial Statements and Supplementary Data” for more information regarding the DRIP.
Estimated Useful Lives of Property and Equipment Property and equipment is carried at cost. Depreciation is computed on a straight-line basis using useful lives that are estimated based on assumptions and judgments that reflect both historical experience and expectations regarding future use of 48 Table of Contents our assets.
Estimated Useful Lives of Property and Equipment Property and equipment is carried at cost. Depreciation is computed on a straight-line basis using useful lives that are estimated based on assumptions and judgments that reflect both historical experience and expectations regarding future use of 49 Table of Contents our assets.
For the year ended December 31, 2022, we recognized a reversal of $0.7 million of our provision for expected credit losses. Favorable market conditions for customers, attributable to sustained increases in commodity prices, was the primary factor supporting the recorded decrease to the allowance for credit losses for the year ended December 31, 2022.
For the year ended December 31, 2022, we recognized a reversal of $0.7 million to the provision for expected credit losses. Favorable market conditions for customers, attributable to sustained increases in commodity prices, was the primary factor supporting the recognized decrease to the allowance for credit losses for the year ended December 31, 2022.
We define Adjusted EBITDA as EBITDA plus impairment of compression equipment, impairment of goodwill, interest income on capital leases, unit-based compensation expense (benefit), severance charges, certain transaction expenses, loss (gain) on disposition of assets, and other.
We define Adjusted EBITDA as EBITDA plus impairment of compression equipment, impairment of goodwill, interest income on capital leases, unit-based compensation expense (benefit), severance charges, certain transaction expenses, loss (gain) on disposition of assets, loss (gain) on derivative instrument, and other.
We expect that anticipated crude oil production increases likewise will increase associated natural gas production volumes throughout 2023, thereby increasing demand for our compression services, particularly in the Permian and Delaware Basins.
We expect that anticipated crude oil production increases likewise will increase associated natural gas production volumes throughout 2024, thereby increasing demand for our compression services, particularly in the Permian and Delaware Basins.
The increase in DCF Coverage Ratio for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to the increase in DCF, partially offset by increased distributions due to an increase in the number of outstanding common units.
DCF Coverage Ratio . The increase in DCF Coverage Ratio for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to the increase in DCF, partially offset by increased distributions due to an increase in the number of outstanding common units.
The Credit Agreement also contains various customary representations and warranties, affirmative covenants, and events of default. We expect to remain in compliance with our covenants under the Credit Agreement throughout 2023.
The Credit Agreement also contains various customary representations and warranties, affirmative covenants, and events of default. We expect to remain in compliance with our covenants under the Credit Agreement throughout 2024.
Discussion and analysis of our operating highlights and financial results of operations for the year ended December 31, 2021, compared to the year ended December 31, 2020, is included under the headings in Part II, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Operating Highlights, Financial Results of Operations, Liquidity and Capital Resources, and Critical Accounting Estimates” in our Annual Report on Form 10-K filed for the year ended December 31, 2021, with the SEC on February 15, 2022.
Discussion and analysis of our operating highlights and financial results of operations for the year ended December 31, 2022, compared to the year ended December 31, 2021, is included under the headings in Part II, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Operating Highlights, Financial Results of Operations, Liquidity and Capital Resources, and Critical Accounting Estimates” in our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 14, 2023.
In addition, the Partnership’s obligations under the Credit Agreement are secured by: (i) substantially all of the Partnership’s assets and substantially all of the assets of the guarantors party to the Credit Agreement, excluding real property and other customary exclusions; and (ii) all of the equity interests of the Partnership’s U.S. restricted subsidiaries (subject to customary exceptions).
In addition, under the Credit Agreement the Partnership’s Secured Obligations (as defined therein) are secured by: (i) substantially all of the Partnership’s assets and substantially all of the assets of the guarantors party to the Credit Agreement, excluding real property and other customary exclusions; and (ii) all of the equity interests of the Partnership’s U.S. restricted subsidiaries (subject to customary exceptions).
The Partnership also must maintain, on a consolidated basis, as of the last day of each fiscal quarter a Total Leverage Ratio (as defined in the Credit Agreement) of not greater than 5.50 to 1.00 through the third fiscal quarter of 2023 and 5.25 to 1.00 thereafter (except that the Partnership may increase the applicable Total Leverage Ratio by 0.25 for any fiscal quarter during which a Specified Acquisition (as defined in the Credit Agreement) occurs and the following two fiscal quarters, but in no event shall the maximum Total Leverage Ratio exceed 5.50 to 1.00 for any fiscal quarter as a 43 Table of Contents result of such increase); an Interest Coverage Ratio (as defined in the Credit Agreement) of not less than 2.50 to 1.00; and a Secured Leverage Ratio (as defined in the Credit Agreement) of not greater than 3.00 to 1.00 or less than 0.00 to 1.00.
The Partnership also must maintain, on a consolidated basis, as of the last day of each fiscal quarter a Total Leverage Ratio (as defined in the Credit Agreement) of not greater than 5.25 to 1.00 (except that the Partnership may increase the applicable Total Leverage Ratio by 0.25 for any fiscal quarter during which a Specified Acquisition (as defined in the Credit Agreement) occurs and the following two fiscal quarters, but in no event shall the maximum Total Leverage Ratio exceed 5.50 to 1.00 for any fiscal quarter as a result of such increase); an Interest Coverage Ratio (as defined in the Credit Agreement) of not less than 2.50 to 1.00; and a Secured Leverage Ratio (as defined in the Credit Agreement) of not greater than 3.00 to 1.00 or less than 0.00 to 1.00.
The $4.5 million increase in parts and service revenue for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to an increase in maintenance work performed on units at customer locations that are outside the scope of our core maintenance activities and that are offered as a convenience, and in directly reimbursable freight and crane charges that are the financial responsibility of the customers.
The $6.2 million increase in parts and service revenue for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to an increase in maintenance work performed on units at customer locations that are outside the scope of our core maintenance activities and that are offered as a convenience, and in directly reimbursable freight and crane charges that are the financial responsibility of the customers.
Distributable Cash Flow We define DCF as net income (loss) plus non-cash interest expense, non-cash income tax expense (benefit), depreciation and amortization expense, unit-based compensation expense (benefit), impairment of compression equipment, impairment of goodwill, certain transaction expenses, severance charges, loss (gain) on disposition of assets, proceeds from insurance recovery, and other, less distributions on Preferred Units and maintenance capital expenditures.
Distributable Cash Flow We define DCF as net income (loss) plus non-cash interest expense, non-cash income tax expense (benefit), depreciation and amortization expense, unit-based compensation expense (benefit), impairment of compression equipment, impairment of goodwill, certain transaction expenses, severance charges, loss (gain) on disposition of assets, change in fair value of derivative instrument, proceeds from insurance recovery, and other, less distributions on Preferred Units and maintenance capital expenditures.
We classify capital expenditures as maintenance or expansion on an individual-asset basis. Over the long term, we expect that our maintenance capital expenditure requirements will continue to increase as the overall size and age of our fleet increases. Our aggregate maintenance capital expenditures for the years ended December 31, 2022, and 2021, were $23.8 million and $19.5 million, respectively.
We classify capital expenditures as maintenance or expansion on an individual-asset basis. Over the long term, we expect that our maintenance capital expenditure requirements will continue to increase as the overall size and age of our fleet increases. Our aggregate maintenance capital expenditures for the years ended December 31, 2023 and 2022, were $25.2 million and $23.8 million, respectively.
During 2021 and throughout 2022, the general energy industry recovered substantially from the low commodity prices and reduced economic activity of 2020, driven by continued demand growth for crude oil and natural gas that occurred as worldwide economic recovery from COVID-19 lock-downs commenced.
Since 2020, the general energy industry recovered substantially from the low commodity prices and reduced economic activity, driven by continued demand growth for crude oil and natural gas that occurred as worldwide economic recovery from COVID-19 lock-downs commenced.
As a result, we recorded impairments of compression equipment of $1.5 million and $5.1 million for the years ended December 31, 2022, and 2021, respectively.
As a result, we recorded impairments of compression equipment of $12.3 million and $1.5 million for the years ended December 31, 2023, and 2022, respectively.
Horsepower utilization based on revenue-generating horsepower and fleet horsepower was 86.1% and 80.4% as of December 31, 2022, and 2021, respectively. (8) Calculated as the average utilization for the months in the period based on utilization at the end of each month in the period.
Horsepower utilization based on revenue-generating horsepower and fleet horsepower was 90.9% and 86.1% as of December 31, 2023, and 2022, respectively. (8) Calculated as the average utilization for the months in the period based on utilization at the end of each month in the period.
Therefore, measures that exclude these cost elements have material limitations. To compensate for these limitations, we believe that it is important to consider net income (loss) and net cash provided by operating activities as determined under GAAP, as well as DCF, to evaluate our financial performance and liquidity.
To compensate for these limitations, we believe that it is important to consider net income (loss) and net cash provided by operating activities as determined under GAAP, as well as DCF, to evaluate our financial performance and liquidity.
Our expansion capital expenditures for the years ended December 31, 2022, and 2021, were $145.1 million and $40.2 million, respectively. As of December 31, 2022, we had binding commitments to purchase $159.3 million worth of additional compression units and serialized parts, all of which is expected to be settled within the next twelve months.
Our expansion capital expenditures for the years ended December 31, 2023 and 2022, were $275.4 million and $145.1 million, respectively. As of December 31, 2023, we had binding commitments to purchase $53.4 million worth of additional compression units and serialized parts, all of which is expected to be settled within the next twelve months.
We currently plan to spend approximately $26.0 million in maintenance capital expenditures during 2023, including parts consumed from inventory. Without giving effect to any equipment that we may acquire pursuant to any future acquisitions, we currently have budgeted between $260.0 million and $270.0 million in expansion capital expenditures for 2023.
We currently plan to spend approximately $32.0 million in maintenance capital expenditures during 2024, including parts consumed from inventory. Without giving effect to any equipment that we may acquire pursuant to any future acquisitions, we currently have budgeted between $115.0 million and $125.0 million in expansion capital expenditures for 2024.
Other Commitments As of December 31, 2022, other commitments include operating and finance lease payments totaling $24.9 million, of which we expect to make payments of $5.1 million to be settled in the next twelve months.
Other Commitments As of December 31, 2023, other commitments include operating and finance lease payments totaling $22.7 million, of which we expect to make payments of $5.4 million to be settled in the next twelve months.
As a result of our evaluations during the years ended December 31, 2022 and 2021, we retired 15 and 26 compression units, respectively, for a total of approximately 3,200 and 11,000 aggregate horsepower, respectively, that previously were used to provide compression services in our business. Interest expense, net .
As a result of our evaluations during the years ended December 31, 2023 and 2022, we retired 42 and 15 compression units, respectively, with approximately 37,700 and 3,200 aggregate horsepower, respectively, that previously were used to provide compression services in our business. Interest expense, net .
Average horsepower utilization based on revenue-generating horsepower and fleet horsepower was 82.9% and 79.8% for the years ended December 31, 2022, and 2021, respectively.
Average horsepower utilization based on revenue-generating horsepower and fleet horsepower was 89.2% and 82.9% for the years ended December 31, 2023, and 2022, respectively.
Our DCF Coverage Ratio, as presented, may not be comparable to similarly titled measures of other companies. 47 Table of Contents The following table summarizes our DCF Coverage Ratio for the periods presented (dollars in thousands): Year Ended December 31, 2022 2021 DCF $ 221,499 $ 209,128 Distributions for DCF Coverage Ratio (1) $ 205,559 $ 203,978 DCF Coverage Ratio 1.08 x 1.03 x ________________________ (1) Represents distributions to the holders of our common units as of the record date.
Our DCF Coverage Ratio, as presented, may not be comparable to similarly titled measures of other companies. 48 Table of Contents The following table summarizes our DCF Coverage Ratio for the periods presented (dollars in thousands): Year Ended December 31, 2023 2022 DCF $ 281,113 $ 221,499 Distributions for DCF Coverage Ratio (1) $ 208,856 $ 205,559 DCF Coverage Ratio 1.35 x 1.08 x ________________________ (1) Represents distributions to the holders of our common units as of the record date.
The expected increase in crude oil production is due in part to the expectation that crude oil prices will remain economic for producers. The EIA estimates that West Texas Intermediate crude oil prices will average $77 per barrel and $72 per barrel for 2023 and 2024, respectively.
The estimated increase in crude oil production is due in part to the expectation that crude oil prices will remain economic for producers. The EIA Outlook estimates that West Texas Intermediate crude oil prices will average $78 per barrel and $75 per barrel for 2024 and 2025, respectively.
To compensate for the limitations of Adjusted gross margin as a measure of our performance, we believe it is important to consider gross margin determined under GAAP, as well as Adjusted gross margin, to evaluate our operating profitability. 44 Table of Contents The following table reconciles Adjusted gross margin to gross margin, its most directly comparable GAAP financial measure, for each of the periods presented (in thousands): Year Ended December 31, 2022 2021 Total revenues $ 704,598 $ 632,645 Cost of operations, exclusive of depreciation and amortization (234,336) (194,389) Depreciation and amortization (236,677) (238,769) Gross margin $ 233,585 $ 199,487 Depreciation and amortization 236,677 238,769 Adjusted gross margin $ 470,262 $ 438,256 Adjusted EBITDA We define EBITDA as net income (loss) before net interest expense, depreciation and amortization expense, and income tax expense (benefit).
To compensate for the limitations of Adjusted gross margin as a measure of our performance, we believe it is important to consider gross margin determined under GAAP, as well as Adjusted gross margin, to evaluate our operating profitability. 45 Table of Contents The following table reconciles Adjusted gross margin to gross margin, its most directly comparable GAAP financial measure, for each of the periods presented (in thousands): Year Ended December 31, 2023 2022 Total revenues $ 846,178 $ 704,598 Cost of operations, exclusive of depreciation and amortization (284,708) (234,336) Depreciation and amortization (246,096) (236,677) Gross margin $ 315,374 $ 233,585 Depreciation and amortization 246,096 236,677 Adjusted gross margin $ 561,470 $ 470,262 Adjusted EBITDA We define EBITDA as net income (loss) before net interest expense, depreciation and amortization expense, and income tax expense (benefit).
DRIP During the years ended December 31, 2022, and 2021, distributions of $2.1 million and $1.8 million, respectively, were reinvested under the DRIP resulting in the issuance of 124,255 and 118,399 common units, respectively.
DRIP During the years ended December 31, 2023 and 2022, distributions of $1.9 million and $2.1 million, respectively, were reinvested under the DRIP resulting in the issuance of 87,808 and 124,255 common units, respectively.
The $27.6 million increase in Adjusted EBITDA for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to a $32.0 million increase in Adjusted gross margin, partially offset by a $4.4 million increase in selling, general, and administrative expenses, excluding unit-based compensation expense, severance charges, and transaction expenses.
The $86.0 million increase in Adjusted EBITDA for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to a $91.2 million increase in Adjusted gross margin, partially offset by a $5.1 million increase in selling, general, and administrative expenses, excluding unit-based compensation expense, severance charges, and transaction expenses. DCF.
Horsepower utilization based on revenue-generating horsepower and fleet horsepower increased to 86.1% as of December 31, 2022, compared to 80.4% as of December 31, 2021.
Horsepower utilization based on revenue-generating horsepower and fleet horsepower increased to 90.9% as of December 31, 2023, compared to 86.1% as of December 31, 2022.
For the years ended December 31, 2022, and 2021, we evaluated the future deployment of our idle fleet assets under then-existing market conditions and retired 15 and 26 compressor units, respectively, for a total of approximately 3,200 and 11,000 aggregate horsepower, respectively, that previously were used to provide compression services in our business.
For the years ended December 31, 2023 and 2022, we evaluated the future deployment of our idle fleet assets under then-current market conditions and retired 42 and 15 compression units, respectively, representing approximately 37,700 and 3,200 of aggregate horsepower, respectively, that previously were used to provide compression services in our business.
The increase primarily was due to an increase in revenue-generating horsepower and an increase in horsepower that is under contract but not yet generating revenue, which was driven by a combination of the redeployment of certain previously idle compression units as well as new units added to our fleet.
The increase primarily was due to an increase in revenue-generating horsepower, which was driven by a combination of the redeployment of certain previously idle compression units as well as the deployment of new compression units added to the fleet.
DCF should not be considered an alternative to, or more meaningful than, net income (loss), operating income (loss), cash flows from operating activities, or any other measure presented in accordance with GAAP. Moreover, our DCF, as presented, may not be comparable to similarly titled measures of other companies.
DCF should not be considered an alternative to, or more meaningful than, net income (loss), operating income (loss), cash flows from operating activities, or any other measure presented in accordance with GAAP.
Our determination of the allowance for credit losses requires us to make estimates and judgments regarding our customers’ ability to pay amounts due. We continuously evaluate the financial strength of our customers and the overall business climate in which our customers operate, and make adjustments to the allowance for credit losses as necessary.
We continuously evaluate the financial strength of our customers and the overall business climate in which our customers operate, and make adjustments to the allowance for credit losses as necessary.
Year Ended December 31, 2022 2021 Increase Fleet horsepower (at period end) (1) 3,716,854 3,689,018 0.8 % Total available horsepower (at period end) (2) 3,826,854 3,689,018 3.7 % Revenue-generating horsepower (at period end) (3) 3,199,548 2,964,206 7.9 % Average revenue-generating horsepower (4) 3,067,279 2,951,013 3.9 % Average revenue per revenue-generating horsepower per month (5) $ 17.35 $ 16.60 4.5 % Revenue-generating compression units (at period end) 4,116 3,942 4.4 % Average horsepower per revenue-generating compression unit (6) 765 750 2.0 % Horsepower utilization (7): At period end 91.8 % 82.7 % 9.1 % Average for the period (8) 88.6 % 82.7 % 5.9 % ________________________ (1) Fleet horsepower is horsepower for compression units that have been delivered to us (and excludes units on order).
Year Ended December 31, 2023 2022 Increase Fleet horsepower (at period end) (1) 3,775,660 3,716,854 1.6 % Total available horsepower (at period end) (2) 3,831,444 3,826,854 0.1 % Revenue-generating horsepower (at period end) (3) 3,433,775 3,199,548 7.3 % Average revenue-generating horsepower (4) 3,328,999 3,067,279 8.5 % Average revenue per revenue-generating horsepower per month (5) $ 18.86 $ 17.35 8.7 % Revenue-generating compression units (at period end) 4,237 4,116 2.9 % Average horsepower per revenue-generating compression unit (6) 792 765 3.5 % Horsepower utilization (7): At period end 94.3 % 91.8 % 2.5 % Average for the period (8) 93.4 % 88.6 % 4.8 % ________________________ (1) Fleet horsepower is horsepower for compression units that have been delivered to us (and excludes units on order).
Management compensates for the limitations of Adjusted EBITDA as an analytical tool by reviewing comparable GAAP measures, understanding the differences between the measures, and incorporating this knowledge into their decision making. 45 Table of Contents The following table reconciles Adjusted EBITDA to net income and net cash provided by operating activities, its most directly comparable GAAP financial measures, for each of the periods presented (in thousands): Year Ended December 31, 2022 2021 Net income $ 30,318 $ 10,279 Interest expense, net 138,050 129,826 Depreciation and amortization 236,677 238,769 Income tax expense 1,016 874 EBITDA $ 406,061 $ 379,748 Interest income on capital lease — 48 Unit-based compensation expense (1) 15,894 15,523 Transaction expenses (2) 27 34 Severance charges 982 494 Loss (gain) on disposition of assets 1,527 (2,588) Impairment of compression equipment (3) 1,487 5,121 Adjusted EBITDA $ 425,978 $ 398,380 Interest expense, net (138,050) (129,826) Non-cash interest expense 7,265 9,765 Income tax expense (1,016) (874) Interest income on capital lease — (48) Transaction expenses (27) (34) Severance charges (982) (494) Other (851) (2,742) Changes in operating assets and liabilities (31,727) (8,702) Net cash provided by operating activities $ 260,590 $ 265,425 ________________________ (1) For the years ended December 31, 2022, and 2021, unit-based compensation expense included $4.4 million and $4.2 million, respectively, of cash payments related to quarterly payments of DERs on outstanding phantom unit awards and $1.3 million and $0.3 million, respectively, related to the cash portion of any settlement of phantom unit awards upon vesting.
Management compensates for the limitations of Adjusted EBITDA as an analytical tool by reviewing comparable GAAP measures, understanding the differences between the measures, and incorporating this knowledge into their decision making. 46 Table of Contents The following table reconciles Adjusted EBITDA to net income and net cash provided by operating activities, its most directly comparable GAAP financial measures, for each of the periods presented (in thousands): Year Ended December 31, 2023 2022 Net income $ 68,268 $ 30,318 Interest expense, net 169,924 138,050 Depreciation and amortization 246,096 236,677 Income tax expense 1,365 1,016 EBITDA $ 485,653 $ 406,061 Unit-based compensation expense (1) 22,169 15,894 Transaction expenses (2) 46 27 Severance charges 841 982 Loss (gain) on disposition of assets (1,667) 1,527 Gain on derivative instrument (7,449) — Impairment of compression equipment (3) 12,346 1,487 Adjusted EBITDA $ 511,939 $ 425,978 Interest expense, net (169,924) (138,050) Non-cash interest expense 7,279 7,265 Income tax expense (1,365) (1,016) Transaction expenses (46) (27) Severance charges (841) (982) Cash received on derivative instrument 6,245 — Other 1,448 (851) Changes in operating assets and liabilities (82,850) (31,727) Net cash provided by operating activities $ 271,885 $ 260,590 ________________________ (1) For the years ended December 31, 2023 and 2022, unit-based compensation expense included $4.4 million and $4.4 million, respectively, of cash payments related to quarterly payments of DERs on outstanding phantom unit awards and $0.3 million and $1.3 million, respectively, related to the cash portion of the settlement of phantom unit awards upon vesting.
The following table reconciles DCF to net income and net cash provided by operating activities, its most directly comparable GAAP financial measures, for each of the periods presented (in thousands): Year Ended December 31, 2022 2021 Net income $ 30,318 $ 10,279 Non-cash interest expense 7,265 9,765 Depreciation and amortization 236,677 238,769 Non-cash income tax benefit (151) (42) Unit-based compensation expense (1) 15,894 15,523 Transaction expenses (2) 27 34 Severance charges 982 494 Loss (gain) on disposition of assets 1,527 (2,588) Impairment of compression equipment (3) 1,487 5,121 Distributions on Preferred Units (48,750) (48,750) Maintenance capital expenditures (4) (23,777) (19,477) DCF $ 221,499 $ 209,128 Maintenance capital expenditures 23,777 19,477 Transaction expenses (27) (34) Severance charges (982) (494) Distributions on Preferred Units 48,750 48,750 Other (700) (2,700) Changes in operating assets and liabilities (31,727) (8,702) Net cash provided by operating activities $ 260,590 $ 265,425 ________________________ (1) For the years ended December 31, 2022, and 2021, unit-based compensation expense included $4.4 million and $4.2 million, respectively, of cash payments related to quarterly payments of DERs on outstanding phantom unit awards and $1.3 million and $0.3 million, respectively, related to the cash portion of any settlement of phantom unit awards upon vesting.
The following table reconciles DCF to net income and net cash provided by operating activities, its most directly comparable GAAP financial measures, for each of the periods presented (in thousands): Year Ended December 31, 2023 2022 Net income $ 68,268 $ 30,318 Non-cash interest expense 7,279 7,265 Depreciation and amortization 246,096 236,677 Non-cash income tax benefit (52) (151) Unit-based compensation expense (1) 22,169 15,894 Transaction expenses (2) 46 27 Severance charges 841 982 Loss (gain) on disposition of assets (1,667) 1,527 Change in fair value of derivative instrument (1,204) — Impairment of compression equipment (3) 12,346 1,487 Distributions on Preferred Units (47,775) (48,750) Maintenance capital expenditures (4) (25,234) (23,777) DCF $ 281,113 $ 221,499 Maintenance capital expenditures 25,234 23,777 Transaction expenses (46) (27) Severance charges (841) (982) Distributions on Preferred Units 47,775 48,750 Other 1,500 (700) Changes in operating assets and liabilities (82,850) (31,727) Net cash provided by operating activities $ 271,885 $ 260,590 ________________________ (1) For the years ended December 31, 2023 and 2022, unit-based compensation expense included $4.4 million and $4.4 million, respectively, of cash payments related to quarterly payments of DERs on outstanding phantom unit awards and $0.3 million and $1.3 million, respectively, related to the cash portion of the settlement of phantom unit awards upon vesting.
The demand for domestic natural gas also continues to benefit from the construction of liquefied natural gas (“LNG”) export infrastructure, which enables industry participants to benefit from attractive global natural gas prices. The U.S. witnessed record LNG exports during 2022 according to the EIA.
The demand for domestic natural gas also continues to benefit from the construction of LNG export infrastructure, which enables industry participants to benefit from attractive global natural gas prices.
Because we distribute all of our available cash, which excludes prudent operating reserves, we expect to fund any future expansion capital expenditures or acquisitions primarily with capital from external financing sources, such as borrowings under the Credit Agreement and issuances of debt and equity securities, including under the DRIP.
We believe cash generated by operating activities and, where necessary, borrowings under the Credit Agreement will be sufficient to service our debt, fund working capital, fund our estimated expansion capital expenditures, fund our maintenance capital expenditures, and pay distributions to our unitholders through 2024. 42 Table of Contents Because we distribute all of our available cash, which excludes prudent operating reserves, we expect to fund any future expansion capital expenditures or acquisitions primarily with capital from external financing sources, such as borrowings under the Credit Agreement and issuances of debt and equity securities, including under the DRIP.
As of December 31, 2022, we had 165,000 large horsepower on order for delivery during 2023.
As of December 31, 2023, we had 52,500 large horsepower on order for expected delivery during 2024.
However, we expect the baseload natural gas demand previously described to continue to support long-term domestic natural gas production. Although our business is focused on providing compression services that do not bear direct exposure to commodity prices, our business exhibits indirect exposure to commodity prices as overall levels of drilling activity are influenced by prevailing commodity prices.
Although our business is focused on providing compression services that do not bear direct exposure to commodity prices, our business exhibits indirect exposure to commodity prices as overall levels of drilling activity and production are influenced by prevailing commodity prices.
The $34.1 million increase in gross margin for the year ended December 31, 2022, compared to the year ended December 31, 2021, was due to (i) a $72.0 million increase in revenues and (ii) a $2.1 million decrease in depreciation and amortization, partially offset by (iii) a $39.9 million increase in cost of operations, exclusive of depreciation and amortization.
The $81.8 million increase in gross margin for the year ended December 31, 2023, compared to the year ended December 31, 2022, was due to (i) a $141.6 million increase in revenues, offset by (ii) a $50.4 million increase in cost of operations, exclusive of depreciation and amortization, and (iii) a $9.4 million increase in depreciation and amortization.
The $95.6 million decrease in net cash used in financing activities for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to (i) an $87.1 million increase in net borrowings under the Credit Agreement and (ii) a $9.4 million decrease in financing costs, primarily due to costs incurred related to the amendment and restatement of our Credit Agreement in the prior comparable period, partially offset by (iii) a $1.1 million increase in common unit distributions.
The $91.4 million decrease in net cash used in financing activities for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to (i) an $96.2 million increase in net borrowings under the Credit Agreement, partially offset by (ii) a $3.5 million increase in cash paid related to net settlement of unit-based awards and (iii) a $1.6 million increase in common unit distributions.
The $63.8 million increase in contract operations revenue for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to (i) a 4.5% increase in average revenue per revenue-generating horsepower per month, as a result of Consumer Price Index (“CPI”)-based and other price increases on customer contracts that occur as market conditions permit, (ii) a 3.9% increase in average revenue-generating horsepower as a result of increased demand for our services, consistent with increased operating activity in the oil and gas industry, and (iii) an increase in revenue attributable to natural gas treating services.
The $129.3 million increase in contract operations revenue for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to (i) an 8.7% increase in average revenue per revenue-generating horsepower per month, as a result of higher market-based rates on newly deployed and redeployed compression units, and CPI-based and other market-based price increases on existing customer contracts that occur as market conditions permit, (ii) an 8.5% increase in average revenue-generating horsepower as a result of increased demand for our services, consistent with increased production levels in the basins in which we operate, and (iii) a $24.2 million increase in revenue attributable to natural gas treating services.
The above-stated factor also drove the increase in average horsepower utilization based on revenue-generating horsepower and fleet horsepower for the year ended December 31, 2022, as compared to the year ended December 31, 2021.
The above-stated factors also drove the 8.5% increase in the average revenue-generating horsepower for the year ended December 31, 2023 as compared to the year ended December 31, 2022.
Adjusted gross margin and Adjusted gross margin percentage. The $32.0 million increase in Adjusted gross margin for the year ended December 31, 2022, compared to the year ended December 31, 2021, was due to a $72.0 million increase in revenues, partially offset by a $39.9 million increase in cost of operations, exclusive of depreciation and amortization.
Adjusted gross margin. The $91.2 million increase in Adjusted gross margin for the year ended December 31, 2023, compared to the year ended December 31, 2022, was due to a $141.6 million increase in revenues, offset by a $50.4 million increase in cost of operations, exclusive of depreciation and amortization. Adjusted EBITDA.
For more detailed descriptions of the Senior Notes 2026 and Senior Notes 2027, please refer to Note 9 to our consolidated financial statements in Part II, Item 8 “Financial Statements and Supplementary Data”.
For a more detailed description of our lease obligations, please refer to Note 7 to our consolidated financial statements in Part II, Item 8 “Financial Statements and Supplementary Data”.
The weighted-average interest rate applicable to borrowings under the Credit Agreement was 4.48% and 2.98% for the years ended December 31, 2022, and 2021, respectively, and average outstanding borrowings under our Credit Agreement were $580.4 million for the year ended December 31, 2022, compared to $491.5 million for the year ended December 31, 2021. Income tax expense.
The weighted-average interest rate applicable to borrowings under the Credit Agreement was 7.68% and 4.48% for the years ended December 31, 2023, and 2022, respectively, and average outstanding borrowings under our Credit Agreement were $757.6 million for the year ended December 31, 2023, compared to $580.4 million for the year ended December 31, 2022. Gain on derivative instrument.
In 2023 and 2024, the EIA Outlook expects U.S. crude oil production growth to continue, estimating average production of 12.4 million bpd for 2023 and 12.8 million bpd in 2024, which would represent the highest annual average crude oil production on record.
In 2024 and 2025, the EIA Outlook expects U.S. crude oil production growth to continue, albeit at a slower rate, estimating average production of 13.2 million bpd for 2024 and 13.4 million bpd in 2025, which would represent new records for annual average crude oil production.
Other Financial Data The following table summarizes other financial data for the periods presented (dollars in thousands): Year Ended December 31, Increase Other Financial Data: (1) 2022 2021 (Decrease) Gross margin $ 233,585 $ 199,487 17.1 % Adjusted gross margin $ 470,262 $ 438,256 7.3 % Adjusted gross margin percentage (2) 66.7 % 69.3 % (2.6) % Adjusted EBITDA $ 425,978 $ 398,380 6.9 % Adjusted EBITDA percentage (2) 60.5 % 63.0 % (2.5) % DCF $ 221,499 $ 209,128 5.9 % DCF Coverage Ratio 1.08 x 1.03 x 4.9 % ________________________ (1) Adjusted gross margin, Adjusted EBITDA, Distributable Cash Flow (“DCF”), and DCF Coverage Ratio are all non-GAAP financial measures.
We had no derivative instruments outstanding for the year ended December 31, 2022. 41 Table of Contents Other Financial Data The following table summarizes other financial data for the periods presented (dollars in thousands): Year Ended December 31, Increase Other Financial Data: (1) 2023 2022 (Decrease) Gross margin $ 315,374 $ 233,585 35.0 % Adjusted gross margin $ 561,470 $ 470,262 19.4 % Adjusted gross margin percentage (2) 66.4 % 66.7 % (0.3) % Adjusted EBITDA $ 511,939 $ 425,978 20.2 % Adjusted EBITDA percentage (2) 60.5 % 60.5 % — % DCF $ 281,113 $ 221,499 26.9 % DCF Coverage Ratio 1.35 x 1.08 x 25.0 % ________________________ (1) Adjusted gross margin, Adjusted EBITDA, Distributable Cash Flow (“DCF”), and DCF Coverage Ratio are all non-GAAP financial measures.
The $39.9 million increase in cost of operations for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to (i) a $19.2 million increase in direct expenses, primarily driven by fluids and parts due to higher costs and increased usage associated with higher revenue-generating horsepower, (ii) a $6.3 million increase in outside maintenance costs due to greater use and higher costs of third-party labor during the current period, (iii) a $3.6 million increase in non-income taxes, primarily due to sales tax refunds received in the prior comparable period, (iv) a $3.4 million increase in direct labor costs due to higher employee costs, (v) a $3.3 million increase in retail parts and service expenses, for which a corresponding increase in parts and service revenue also occurred, and (vi) a $2.8 million increase in expenses related to our vehicle fleet, primarily due to increased fuel costs and increased usage, as well as higher costs of maintenance during the current period.
The $50.4 million increase in cost of operations for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to (i) a $26.0 million increase in direct expenses, primarily driven by fluids and parts due to higher costs and increased usage associated with increased revenue-generating horsepower, (ii) a $13.6 million increase in direct labor costs due to increased headcount associated with increased revenue-generating horsepower and higher employee costs, (iii) a $5.1 million increase in retail parts and service expenses, for which a corresponding increase in parts and service revenue also occurred, (iv) a $1.6 million increase in other indirect expenses primarily due to increased consumption and costs of supplies associated with increased revenue-generating horsepower, (v) a $1.5 million increase in expenses related to our vehicle fleet, primarily due to increased usage and maintenance costs associated with increased revenue-generating horsepower, and (vi) a $1.4 million increase in non-income taxes associated with increased revenue-generating horsepower in taxable jurisdictions.
The $12.4 million increase in DCF for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to (i) a $32.0 million increase in Adjusted gross margin, partially offset by (ii) a $10.7 million increase in cash interest expense, net, (iii) a $4.4 million increase in selling, general, and administrative expenses, excluding unit-based compensation expense, severance charges, and transaction expenses, and (iv) a $4.3 million increase in maintenance capital expenditures. 41 Table of Contents DCF Coverage Ratio .
The $59.6 million increase in DCF for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to (i) a $91.2 million increase in Adjusted gross margin, (ii) a $6.2 million increase in cash received on derivative instrument, and (iii) a $1.0 million decrease in distributions on Preferred Units, partially offset by (iv) a $31.9 million increase in cash interest expense, net, (v) a $5.1 million increase in selling, general, and administrative expenses, excluding unit-based compensation expense, severance charges, and transaction expenses, and (vi) a $1.5 million increase in maintenance capital expenditures.
The increase in horsepower utilization is the result of increased demand for our services, consistent with increased operating activity in the oil and gas industry. The above-stated factors also drove the increase in average horsepower utilization for the year ended December 31, 2022, as compared to the year ended December 31, 2021.
The increase in horsepower utilization resulted from increased demand for our services, consistent with increased production levels in the basins in which we operate. The above-stated factors also drove the increase in average horsepower utilization for the year ended December 31, 2023 as compared to the year ended December 31, 2022.
Liquidity and Capital Resources Overview We operate in a capital-intensive industry, and our primary liquidity needs are to finance the purchase of additional compression units, make other capital expenditures, service our debt, fund working capital, and pay distributions.
Liquidity and Capital Resources Overview We operate in a capital-intensive industry, and our primary liquidity needs include financing the purchase of additional compression units, making other capital expenditures, servicing our debt, funding working capital, and paying cash distributions on our outstanding preferred and common equity.
On December 8, 2021, the Partnership amended and restated the Credit Agreement. The Credit Agreement provides for an asset-based revolving credit facility to be made available to the Partnership in an aggregate amount of $1.6 billion.
The Credit Agreement matures on December 8, 2026, except that if any portion of the Senior Notes 2026 are outstanding on December 31, 2025, the Credit Agreement will mature on December 31, 2025. The Credit Agreement provides for an asset-based revolving credit facility to be made available to the Partnership in an aggregate amount of $1.6 billion.
The increase in horsepower utilization based on revenue-generating horsepower and fleet horsepower primarily was driven by the redeployment of certain previously idle compression units due to increased demand for our services, consistent with increased operating activity in the oil and gas industry.
The increase in horsepower utilization based on revenue-generating horsepower and fleet horsepower primarily was driven by the redeployment of certain previously idle compression units as well as the deployment of new compression units added to the fleet.
The remaining change primarily relates to various asset disposals. Impairment of compression equipment . The $1.5 million and $5.1 million impairments of compression equipment during the years ended December 31, 2022 and 2021, respectively, primarily were the result of our evaluations of the future deployment of our idle fleet under then-existing market conditions.
The $12.3 million and $1.5 million impairments of compression equipment during the years ended December 31, 2023 and 2022, respectively, primarily resulted from our evaluation of the future deployment of our idle fleet assets under then-current market conditions.
The $5.2 million increase in selling, general, and administrative expense for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to (i) a $2.0 million decrease to the allowance for credit losses, resulting from a $0.7 million reversal of previously recognized credit losses in the current period versus a $2.7 million reversal in the prior comparable period, (ii) a $1.1 million increase in employee-related expenses, (iii) a $0.5 million increase in professional fees, (iv) a $0.5 million increase in severance charges, primarily attributable to the departure of one of our executives during the current period, and (v) a $0.4 million increase in other taxes.
The $11.4 million increase in selling, general, and administrative expense for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to (i) a $6.3 million increase in unit-based compensation expense, primarily attributable to mark-to-market changes to our unit-based compensation liability that occurred as a result of changes to our per-unit trading price as of December 31, 2023, (ii) a $2.2 million increase to the allowance for credit losses, resulting from a $1.5 million increase to the provision for expected credit losses in the current period versus a $0.7 million reversal of previously recognized credit losses in the prior comparable period, and (iii) a $2.1 million increase in employee-related expenses, driven by increased headcount and higher employee costs.
The $8.2 million increase in interest expense, net for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to higher weighted-average interest rates and increased borrowings under 40 Table of Contents the Credit Agreement, partially offset by a decrease in amortization of debt issuance costs attributable to the amendment and restatement of the Credit Agreement in the prior comparable period.
The $31.9 million increase in interest expense, net for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to higher weighted-average interest rates and increased borrowings under the Credit Agreement.
The 3.7% increase in total available horsepower as of December 31, 2022, compared to December 31, 2021, primarily was due to compression units added to our fleet to meet incremental demand from customers for our compression services. 38 Table of Contents The 7.9% increase in revenue-generating horsepower and 4.4% increase in revenue-generating compression units as of December 31, 2022, compared to December 31, 2021, primarily were driven by the redeployment of certain previously idle compression units due to increased demand for our services, commensurate with increased operating activity in the oil and gas industry.
The 7.3% increase in revenue-generating horsepower and 2.9% increase in revenue-generating compression units as of December 31, 2023, compared to December 31, 2022, primarily were driven by both the redeployment of, and addition of new, large-horsepower compression units due to increased demand for our services commensurate with increased production levels 38 Table of Contents in the basins in which we operate.
The $90.8 million increase in net cash used in investing activities for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to an $89.0 million increase in capital expenditures, for purchases of new compression units, reconfiguration costs, and other equipment. Net cash used in financing activities .
The $102.7 million increase in net cash used in investing activities for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to a $104.3 million increase in capital expenditures, for purchases of new compression units, overhauls and major improvements, and purchases of other equipment, partially offset by a $1.7 million increase in proceeds from disposition of property and equipment. 43 Table of Contents Net cash used in financing activities .
For a more detailed description of the Credit Agreement, including the covenants and restrictions contained therein, please refer to Note 9 to our consolidated financial statements in Part II, Item 8 “Financial Statements and Supplementary Data.”.
For a more detailed description of the Credit Agreement, including the covenants and restrictions contained therein, see Note 10 to our consolidated financial statements in Part II, Item 8 “Financial Statements and Supplementary Data.”. 44 Table of Contents Senior Notes As of December 31, 2023, we had $725.0 million and $750.0 million aggregate principal amount outstanding on our Senior Notes 2026 and Senior Notes 2027, respectively.
Because we use capital assets, depreciation, impairment of compression equipment, loss (gain) on disposition of assets, the interest cost of acquiring compression equipment, and maintenance capital expenditures are necessary components of our 46 Table of Contents aggregate costs. Unit-based compensation expense related to equity awards granted to employees also is a meaningful business expense.
Moreover, our DCF, as presented, may not be comparable to similarly titled measures of other companies. 47 Table of Contents Because we use capital assets, depreciation, impairment of compression equipment, loss (gain) on disposition of assets, the interest cost of acquiring compression equipment, and maintenance capital expenditures are necessary components of our aggregate costs.
The EIA’s January 2023 Short-Term Energy Outlook (“EIA Outlook”) estimates that annual U.S. crude oil production averaged 11.9 million barrels per day (“bpd”) in 2022, up 0.6 million bpd from 2021, primarily due to production growth in the Permian and Delaware Basins.
The EIA Outlook estimates that annual U.S. crude oil production averaged 12.9 million bpd in 2023, up 1.0 million bpd from 2022, primarily due to production growth in the Permian region of western Texas and eastern New Mexico.
For a more detailed description of our lease obligations, please refer to Note 7 to our consolidated financial statements in Part II, Item 8 “Financial Statements and Supplementary Data”. 42 Table of Contents Cash Flows The following table summarizes our sources and uses of cash for the years ended December 31, 2022, and 2021, (in thousands): Year Ended December 31, 2022 2021 Net cash provided by operating activities $ 260,590 $ 265,425 Net cash used in investing activities (129,945) (39,188) Net cash used in financing activities (130,610) (226,239) Net cash provided by operating activities .
Cash Flows The following table summarizes our sources and uses of cash for the years ended December 31, 2023 and 2022, (in thousands): Year Ended December 31, 2023 2022 Net cash provided by operating activities $ 271,885 $ 260,590 Net cash used in investing activities (232,653) (129,945) Net cash used in financing activities (39,256) (130,610) Net cash provided by operating activities .
Revolving Credit Facility As of December 31, 2022, we were in compliance with all of our covenants under the Credit Agreement. As of December 31, 2022, we had outstanding borrowings under the Credit Agreement of $646.0 million, $954.0 million of availability and, subject to compliance with the applicable financial covenants, available borrowing capacity of $333.1 million.
As of December 31, 2023, we were in compliance with all of our covenants under the Credit Agreement. As of February 8, 2024, we had outstanding borrowings under the Credit Agreement of $927.5 million and outstanding letters of credit of $0.5 million.
For the year ended December 31, 2021, we recognized a reversal of $2.7 million of our provision for expected credit losses. Improved market conditions for customers resulting from improved commodity prices was the primary factor supporting the recorded decrease to the allowance for credit losses for the year ended December 31, 2021.
For the year ended December 31, 2023, we recognized a $1.5 million increase to the provision for expected credit losses. Unfavorable developments related to customers in bankruptcy was the primary factor supporting the recognized increase to the allowance for credit losses for the year ended December 31, 2023.
The 4.5% increase in average revenue per revenue generating horsepower per month for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to select price increases on our existing fleet. The 2.0% increase in average horsepower per revenue-generating compression unit primarily was due to the redeployment of larger-horsepower compression units.
The 8.7% increase in average revenue per revenue-generating horsepower per month for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to higher market-based rates on newly deployed and redeployed compression units, and CPI-based and other market-based price increases on existing customer contracts that occur as market conditions permit.
As a result, the $44.9 million accrued liability and $44.9 million related-party receivable from Energy Transfer was reduced to zero as of December 31, 2022. Allowance for Credit Losses We maintain an allowance for credit losses for our trade accounts receivable based on specific customer collection issues and historical experience.
Allowance for Credit Losses We maintain an allowance for credit losses for our trade accounts receivable based on specific customer collection issues and historical experience. Our determination of the allowance for credit losses requires us to make estimates and judgments regarding our customers’ ability to pay amounts due.
We estimate that the range of losses we could incur is from $0 to approximately $21.8 million, including penalties and interest.
We estimate that the range of losses we could incur is from $0 to approximately $25.8 million, including penalties and interest. Our U.S. federal income tax returns for years 2019 and 2020 currently are under examination by the IRS. The IRS has issued preliminary partnership examination changes, along with imputed underpayment computations, for the 2019 and 2020 tax years.
Depreciation and amortization expense . The $2.1 million decrease in depreciation and amortization expense for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to increased asset disposals and assets reaching the end of their depreciable lives. Selling, general, and administrative expense .
Depreciation and amortization expense . The $9.4 million increase in depreciation and amortization expense for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to new compression units placed in service to meet incremental demand from customers and overhauls and major improvements to compression units. Selling, general, and administrative expense .
The $4.8 million decrease in net cash provided by operating activities for the year ended December 31, 2022, compared to the year ended December 31, 2021, primarily was due to changes in other working capital, offset by an $18.2 million increase in net income, as adjusted for non-cash items. Net cash used in investing activities .
The $11.3 million increase in net cash provided by operating activities for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily was due to (i) an increase in cash inflows from a $91.2 million increase in Adjusted gross margin, partially offset by (ii) a $45.2 million increase in inventory purchases and (iii) a $34.6 million increase in cash paid for interest expense, net of capitalized amounts.
Conversely, decreased drilling activity may cause demand for new compression services to decline. 37 Table of Contents The broader outlook for commodity prices improved considerably during 2022, and although uncertainty with respect to future natural gas demand may have a varying impact on our business, we believe the longer-term outlook for natural gas fundamentals remains positive for 2023 and beyond.
Although we believe the longer-term outlook for natural gas fundamentals remains positive for 2024 and beyond, the uncertainty created by the heightened tensions in the Middle East, the Russia-Ukraine conflict, the slowing global economy and general geopolitical events on the demand for crude oil and natural gas may have a varying impact on our business.