Biggest changeResults of Operations Year Ended December 31, 2022 Compared to Year Ended December 31, 2021 The following table sets forth for the periods indicated, the percentages of the net sales represented by certain items reflected in our statements of operations for the years ended December 31, 2022 and 2021: Years ended December 31, 2022 2021 Revenues 100.0 % 100.0 % Cost of Sales 55.7 52.5 Gross Profit 44.3 47.5 General and administrative 43.6 40.1 Selling 7.2 10.1 Research and development 2.9 2.2 Total operating expenses 53.7 52.5 Loss from operations (9.4) (5.0) Total other income (expense), net (0.1) 20.4 Consolidated net income (loss) (9.6) 15.3 (Income) loss attributable to the noncontrolling interest (0.2) (0.2) Net income (loss) attributable to Tecogen Inc.
Biggest changeTable of Contents Years ended December 31, 2023 2022 Revenues 100.0 % 100.0 % Cost of Sales 59.4 55.7 Gross Profit 40.6 44.3 Operating expenses: General and administrative 47.3 43.6 Selling 7.7 7.2 Research and development 3.3 2.9 Gain on sale of assets (0.1) (0.2) Long-lived asset impairment — — Total operating expenses 58.1 53.7 Loss from operations (17.6) (9.4) Total other expense, net (0.3) (0.1) Consolidated net loss (18.0) (9.6) Income attributable to the noncontrolling interest (0.3) (0.2) Net loss attributable to Tecogen Inc.
During 2018, we early-adopted the provisions of ASU 2017-04 which simplified goodwill impairment testing by eliminating the requirement to determine the implied value of goodwill where a quantitative analysis indicates that the carrying value of the reporting unit exceeds its fair value. At a minimum, we perform a quantitative goodwill impairment test in the fourth quarter of the year.
During 2018, we adopted the provisions of ASU 2017-04 which simplified goodwill impairment testing by eliminating the requirement to determine the implied value of goodwill where a quantitative analysis indicates that the carrying value of the reporting unit exceeds its fair value. At a minimum, we perform a quantitative goodwill impairment test in the fourth quarter of the year.
Leasehold improvements are amortized using the straight-line method over the lesser of the estimated useful lives of the assets or the term of the related leases. Expenditures for maintenance and repairs are expensed currently, while renewals and betterments that materially extend the life of an asset are capitalized.
Leasehold improvements are amortized using the straight-line method over the lesser of the estimated useful lives of the assets or the term of the related leases. Expenditures for maintenance and repairs are expensed, while renewals and betterments that materially extend the life of an asset are capitalized.
The impairment analysis recognizes the shortening of remaining contract terms with customers without replacement and without further growth, as well as less than expected cost savings and, offset by profitability from our initiatives to optimize the long-term profitability of our various site operations, and a price peak of the Company's stock on the date of the business combination to which the goodwill relates (see also Note 5."Sale of Energy Producing Assets and Goodwill Impairment").
The impairment analysis recognizes the shortening of remaining contract terms with customers without replacement and without further growth, as well as less than expected cost savings, offset by profitability from our initiatives to optimize the long-term profitability of our various site operations and a price peak of the Company's stock on the date of the business combination to which the goodwill relates (see also Note 6."Sale of Energy Producing Assets and Goodwill Impairment").
For the last two fiscal years, more than half of our revenue was generated from long-term maintenance and energy production contracts, which provides us with a predictable revenue stream, especially during the summer months. We experience a slight surge of activity from May through September as our “chiller season” is in full swing. Our O&M service 24 TECOGEN INC.
For the last two fiscal years, more than half of our revenue was generated from long-term maintenance and energy production contracts, which provides us with a predictable revenue stream, especially during the summer months. We experience a slight surge of activity from May through September as our “chiller season” is in full swing. Our O&M service 26 TECOGEN INC.
To date we have shipped over 3,150 units, some of which have been operating for almost 35 years. Although we may, from time to time, have one or a few customers who may represent more than 10% of our product revenue for a given year, we are not dependent on the recurrence of revenue from those customers.
To date we have shipped over 3,200 units, some of which have been operating for almost 35 years. Although we may, from time to time, have one or a few customers who may represent more than 10% of our product revenue for a given year, we are not dependent on the recurrence of revenue from those customers.
During the years ended December 31, 2022 and 2021, our revenues were negatively impacted due to customer order delays or deferrals; service delays due to customer facility closures, in some cases for extended periods; and a reduction in our energy production segment revenue due to business closures and increased remote work and learning environments.
During the years ended December 31, 2023 and 2022, our revenues were negatively impacted due to customer order delays or deferrals; service delays due to customer facility closures, in some cases for extended periods; and a reduction in our energy production segment revenue due to business closures and increased remote work and learning environments.
In order to grow our business and fund the development of our hydrid-drive air-cooled chiller and the relocation of our primary facility, we expect that our cash requirements will increase and we may need to raise additional capital through a debt or equity financing to meet our need for capital to fund operations and future growth.
In order to grow our business and fund the development of our hybrid-drive air-cooled chiller and the relocation of our primary facility, we expect that our cash requirements will increase and we may need to raise additional capital through a debt or equity financing to meet our need for capital to fund operations and future growth.
In the fourth quarter of 2022, we performed a quantitative goodwill impairment test for our energy production reporting unit acquired in 2017. We used a discounted cash flow approach to develop the estimated fair value of that reporting unit. Management judgment is required in developing the assumptions for the discounted cash flow model.
In the fourth quarter of 2023, we performed a quantitative goodwill impairment test for our energy production reporting unit acquired in 2017. We used a discounted cash flow approach to develop the estimated fair value of that reporting unit. Management judgment is required in developing the assumptions for the discounted cash flow model.
During the year ended December 31, 2022, our revenues were negatively impacted due to customer order delays or deferrals; service delays due to customer facility closures, in some cases for extended periods and a reduction in our energy production revenues, due to business closures and increased remote work and learning environments.
During the year ended December 31, 2023, our revenues were negatively impacted due to customer order delays or deferrals; service delays due to customer facility closures, in some cases for extended periods and a reduction in our energy production revenues, due to business closures and increased remote work and learning environments.
In determining the estimate of fair value of customer energy production contracts, the measure of market, and thus the baseline to measure the amount related to any of the off-market terms or conditions with respect to the contracts, was considered best determined, given the nature of the services provided under the contracts, by utilizing a benchmark level of margin, in this case 35% of revenue which is consistent with the average return on revenue of US investor owned public utilities.
In determining the estimate of fair value of customer energy production contracts, the measure of market, and thus the baseline to measure the amount related to any of the off-market terms or conditions with respect to the contracts, was considered best determined, given the nature of the services provided under the contracts, by utilizing a benchmark level of margin, in this case 35% of revenue which is consistent with the average return on revenue of US investor owned public utilities. 29 TECOGEN INC.
Management believes that the following are critical accounting policies: Revenue Recognition Revenue is recognized when performance obligations under the terms of a contract with our customer are satisfied. This generally occurs with the transfer of control of our products, services and energy production.
Management believes that the following are critical accounting estimates: Revenue Recognition Revenue is recognized when performance obligations under the terms of a contract with our customer are satisfied. This generally occurs with the transfer of control of our products, services and energy production.
Our service operation revenues grow with the sales of installed systems, since the majority of our product sales are accompanied by a service contract or time and materials agreements. As a result our “fleet” of units being serviced by our service department grows with product sales.
Table of Contents Our service operation revenues grow with the sales of installed systems, since the majority of our product sales are accompanied by a service contract or time and materials agreements. As a result, our “fleet” of units being serviced by our service department grows with product sales.
CEA facilities enable multiple crop cycles (15 to 20 cycles) in one year compared to one or two crop cycles in conventional farming. In addition, growing produce close to the point of sale reduces food spoilage during transportation.
Table of Contents CEA facilities enable multiple crop cycles (15 to 20 cycles) in one year compared to one or two crop cycles in conventional farming. In addition, growing produce close to the point of sale reduces food spoilage during transportation.
An impairment would be recorded if the carrying amount of a reporting unit including goodwill exceeded the estimated fair value. Based on the aforementioned analysis, the carrying amount of that reporting unit, including goodwill, exceeded the estimated fair value and there was no impairment at December 31, 2022. See Note 5. "Sale of Energy Producing Assets and Goodwill Impairment".
An impairment would be recorded if the carrying amount of a reporting unit including goodwill exceeded the estimated fair value. Based on the aforementioned analysis, the carrying amount of that reporting unit, including goodwill, exceeded the estimated fair value and there was no impairment at December 31, 2023. See Note 6. "Sale of Energy Producing Assets and Goodwill Impairment".
Table of Contents projected undiscounted cash flows (excluding interest charges) is less than the carrying value of the assets, the assets will be written down to the estimated fair value and such loss is recognized in income from continuing operations in the period in which the determination is made.
If the sum of the projected undiscounted cash flows (excluding interest charges) is less than the carrying value of the assets, the assets will be written down to the estimated fair value and such loss is recognized in income from continuing operations in the period in which the determination is made.
Goodwill Goodwill is not amortized; however, it is reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.
Table of Contents Goodwill Goodwill is not amortized; however, it is reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.
"Fair value measurements". Provision for State Income Taxes The provision for state income taxes for the years ended December 31, 2022 and 2021 was $16,352 and $19,491, respectively, and represents estimated income tax payments, net of refunds, to various states.
"Fair Value Measurements". Provision for State Income Taxes The provision for state income taxes for the years ended December 31, 2023 and 2022 was $32,491 and $16,352, respectively, and represents estimated income tax payments, net of refunds, to various states.
Any reserves that result from this review are charged to cost of sales. Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation is provided using the straight-line method over the estimated useful life of the asset, which range from three to fifteen years.
Any reserves that result from this review are charged to cost of sales. 28 TECOGEN INC. Table of Contents Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation is provided using the straight-line method over the estimated useful life of the asset, which range from three to fifteen years.
Table of Contents Net Income (Loss) Per Share Net income per share for the year ended December 31, 2022 was a loss of $0.10 compared to income of $0.15 per share for the same period in 2021. The basic and diluted weighted average shares outstanding for the year ended December 31, 2022 were 24,850,261 and 24,850,261, respectively.
Net Income (Loss) Per Share Net loss per share for the year ended December 31, 2023 was a loss of $0.19 compared to a loss of $0.10 per share for the same period in 2022. The basic and diluted weighted average shares outstanding for the year ended December 31, 2023 were 24,850,261 and 24,850,261, respectively.
We evaluate the recoverability of our long-lived assets when impairment is indicated by comparing the net book value of the asset group to the estimated future undiscounted cash flows attributable to such assets. f the sum of the 27 TECOGEN INC.
We evaluate the recoverability of our long-lived assets when impairment is indicated by comparing the net book value of the asset group to the estimated future undiscounted cash flows attributable to such assets.
Our existing customers include hospitals and nursing homes, colleges and universities, health clubs and spas, hotels and motels, office and retail buildings, food and beverage processors, multi-unit residential buildings, laundries, ice rinks, swimming pools, factories, municipal buildings, military installations and indoor growing facilities.
We have agreements in place with distributors and sales representatives. Our existing customers include hospitals and nursing homes, colleges and universities, health clubs and spas, hotels and motels, office and retail buildings, food and beverage processors, multi-unit residential buildings, laundries, ice rinks, swimming pools, factories, municipal buildings, military installations and indoor growing facilities.
Noncontrolling Interest With the addition of American DG Energy, we have income and losses attributable to the noncontrolling interest we have in American DG Energy's 51% owned subsidiary, ADGNY, LLC. The noncontrolling interest share of ADGNY profits and losses was income of $50,215 for the year ended December 31, 2022 and income of $45,017 in 2021.
Noncontrolling Interest We have income and losses attributable to the noncontrolling interest we have in American DG Energy's 51% owned subsidiary, ADGNY, LLC. The noncontrolling interest share of ADGNY profits and losses was income of $74,952 for the year ended December 31, 2023 and income of $50,215 in 2022.
Risk Factors” of this Annual Report on Form 10-K for a discussion of important factors that could cause actual results to differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis. Overview Tecogen designs, manufactures, markets, and maintains high efficiency, ultra-clean cogeneration products.
Risk Factors” of this Annual Report on Form 10-K for a discussion of important factors that could cause actual results to differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis.
For the year ended December 31, 2021, basic and diluted shares were 24,850,261 and 25,115,518, respectively.
For the year ended December 31, 2022, basic and diluted shares were 24,850,261 and 24,850,261, respectively.
Table of Contents reported amounts of assets, liabilities, sales and expenses, and related disclosure of contingent assets and liabilities. These judgments, assumptions and estimates are made or applied within the context of accounting policies related to the nature of the transaction. Note 2.
The preparation of these financial statements requires us to make judgments, assumptions and estimates that affect the reported amounts of assets, liabilities, sales and expenses, and related disclosure of contingent assets and liabilities. These judgments, assumptions and estimates are made or applied within the context of accounting policies related to the nature of the transaction. Note 2.
Tecochill Hybrid-Drive Air-Cooled Chiller Development During the third quarter of 2021 we began development of the Tecochill Hybrid-Drive Air-Cooled Chiller. We recognized that there were many applications where the customer wanted an easy to install roof top chiller.
"Aegis Contract and Related Asset Acquisition" in the Notes to Consolidated Financial Statements. Tecochill Hybrid-Drive Air-Cooled Chiller Development During the third quarter of 2021 we began development of the Tecochill Hybrid-Drive Air-Cooled Chiller. We recognized that there were many applications where the customer wanted an easy to install roof top chiller.
Net Income (Loss) Attributable to Tecogen Inc Net loss for the year ended December 31, 2022 was $2,447,927 compared to a net income of $3,696,000 for the comparable period in 2021.
Net Loss Attributable to Tecogen Inc Net loss for the year ended December 31, 2023 was $4,598,108 compared to a net loss of $2,447,927 for the comparable period in 2022.
Gains on the sale of assets was $41,931 in 2022 compared to a gain on the sale of assets of $10,486 in 2021. Impairment of long-lived assets decreased $2,726 to $4,674 in the year ended December 31, 2022 compared to $7,400 in 2021.
Gains on the sale of assets was $36,207 in 2023 compared to a gain on the sale of assets of $41,931 in 2022. Impairment of long-lived assets decreased $4,674 in the year ended December 31, 2023 compared to 2022.
Table of Contents revenue which has grown from year to year since 2005, with our New York City/New Jersey and New England systems experiencing the majority of the growth, was impacted to some extent by the COVID-19 pandemic.
Table of Contents revenue which has grown from year to year since 2005, with our New York City/New Jersey and New England systems experiencing the majority of the growth, was positively impacted by the Aegis maintenance agreement acquisition in 2023.
The discount rate, profitability assumptions, and terminal growth rate of this reporting unit were the material assumptions utilized in the discounted cash flow model used to estimate its fair value. The discount rate reflects an estimate of our weighted-average cost of capital. 28 TECOGEN INC.
The discount rate, profitability assumptions, and terminal growth rate of the Energy Production unit were the material assumptions utilized in the discounted cash flow model used to estimate its fair value. The discount rate reflects an estimate of our weighted-average cost of capital. The discounted cash flow analysis requires estimates, assumptions and judgments about future events.
Critical Accounting Policies Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires us to make judgments, assumptions and estimates that affect the 26 TECOGEN INC.
Critical Accounting Estimates Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States.
Table of Contents cooling, power generation, and greenhouse gas reduction to address critical issues affecting food and energy security. We propose to address this challenge by developing a highly efficient energy solution for CEA grown produce using our cogeneration products in conjunction with solar energy generation, energy storage, and other technologies.
We propose to address this challenge by developing a highly efficient energy solution for CEA grown produce using our cogeneration products in conjunction with solar energy generation, energy storage, and other technologies. 27 TECOGEN INC.
We believe the assumptions used in our goodwill impairment analysis are appropriate and result in a reasonable estimate of the fair value of the reporting unit.
Our analysis uses our internally generated long-range plan. The long-range plan reflects management's judgment and assumptions about future events. We believe the assumptions used in our goodwill impairment analysis are appropriate and result in a reasonable estimate of the fair value of the reporting unit.
Loss from Operations Loss from operations for the year ended December 31, 2022 was $2,349,141 compared to a loss of $1,219,092 in 2021, an increase in the loss from operations of $1,130,049.
Loss from Operations Loss from operations for the year ended December 31, 2023 was $4,413,612 compared to a loss of $2,349,141 in 2022, an increase in the loss from operations of $2,064,471.
Chiller units for space conditioning applications are generally shut down in the winter and started up again in the spring. This chiller “busy season” for the service team generally runs from May through the end of September. Chillers in indoor cultivation and other process cooling applications run year round.
Our service team does experience higher demand in the warmer months when cooling is required. Chiller units for space conditioning applications are generally shut down in the winter and started up again in the spring. This chiller “busy season” for the service team generally runs from May through the end of September.
We introduced the Tecochill Hybrid-Drive Air-Cooled Chiller at the AHR Expo in February 2023 and expect to see incremental revenue in the fourth quarter of 2023. A patent application based on this concept has been filed with the US Patent and Trademark Office.
We introduced the Tecochill Hybrid-Drive Air-Cooled Chiller at the AHR Expo in February 2023 and received an order on February 8, 2024 for three hybrid-drive air-cooled chillers for a utility in Florida. A patent application based on this concept has been filed with the US Patent and Trademark Office.
The revenue increase in 2022 compared to 2021 is due primarily to an increase in cogeneration sales of $2,015,256, due to increased unit volume, which is partially offset by a $303,962 decrease in sales of engineered accessories and a decrease in chiller sales of $688,524.
The revenue decrease in 2023 compared to 2022 is due primarily to a decrease in cogeneration sales of $2,517,902, due to decreased unit volume and a $47,596 decrease in sales of engineered accessories, which are partially offset by an increase in chiller sales of $269,345.
Liquidity and Capital Resources The following table presents a summary of our net cash flows from operating, investing, and financing activities: Years End Cash Provided by (Used in) December 31, 2022 December 31, 2021 Operating activities $ (1,351,929) $ 465,033 Investing activities (348,565) (215,058) Financing activities — 1,874,269 Change in cash and cash equivalents $ (1,700,494) $ 2,124,244 Consolidated working capital at December 31, 2022 was $14,344,288, compared to $16,193,881 at December 31, 2021, a decrease of $1,849,593 or 11.4%.
Liquidity and Capital Resources The following table presents a summary of our net cash flows from operating, investing, and financing activities: Years End Cash Provided by (Used in) December 31, 2023 December 31, 2022 Operating activities $ (823,315) $ (1,351,929) Investing activities (244,889) (348,365) Financing activities 505,505 — Change in cash and cash equivalents $ (562,699) $ (1,700,294) Consolidated working capital at December 31, 2023 was $9,822,546, compared to $14,344,288 at December 31, 2022, a decrease of $4,521,742 or 31.5%.
Our systems generate electricity and hot water or in the case of our Tecochill product, both chilled water and hot water. These result in savings of energy related costs of up to 60% for our customers. Our products are expected to run on Renewable Natural Gas (RNG) as it is introduced into the US gas pipeline infrastructure.
These result in savings of energy related costs of up to 60% for our customers. Our products are expected to run on Renewable Natural Gas (RNG) as it is introduced into the US gas pipeline infrastructure. Our products are sold directly to end-users by our in-house sales team and by established sales agents and representatives.
Research and development expenses increased in the year ended December 31, 2022 to $732,873 compared to $542,079, an increase of $190,794 due to costs incurred to develop the hybrid-drive air-cooled chiller, which included a $96,172 increase in payroll cost and a $92,270 increase in outside development costs.
Table of Contents Research and development expenses increased in the year ended December 31, 2023 to $840,011 compared to $732,873, an increase of $107,138 due to costs incurred to develop the hybrid-drive air-cooled chiller, which included a $72,700 increase in payroll cost and a $29,250 increase in consulting costs.
The increase in the net loss from operations is primarily due to a $520,842 decrease in gross margin due to higher products material costs and a $609,207 increase in operating expenses.
The increase in the net loss from operations is primarily due to lower Products sales, a $865,193 decrease in gross margin due to higher products material costs and the increased provision for obsolete inventory and a $1,199,278 increase in operating expenses.
In 2019, we also reintroduced our TecoFrost refrigeration line. The sales cycle varies between 6 months to a year or more. Therefore, our product revenue can be difficult to predict and the expected margin can vary. In most cases we work with consulting engineers who specify our product in new and retrofit applications.
Our product revenue is derived from the sale of the various cogeneration modules, such as the InVerde, InVerde e+, the Tecopower, and Tecochill products. In 2019, we also reintroduced our TecoFrost refrigeration line. The sales cycle varies between 6 months to a year or more. Therefore, our product revenue can be difficult to predict and the expected margin can vary.
For the year ended December 31, 2022 we used $1,351,929 in cash from operations compared to generating $465,033 in cash from operations in 2021, a decrease of $1,816,962 in net cash provided by operating activities. Our accounts receivable balance decreased by $2,401,904 at December 31, 2022 compared to December 31, 2021.
For the year ended December 31, 2023 we used $823,315 in cash from operations compared to $1,351,929 in cash used from operations in 2022, a decrease of $528,614 in net cash used by operating activities.
Recent Developments Assumption of Aegis Energy Services Maintenance Agreements On March 15, 2023, we entered into an Agreement with Aegis Energy Services, LLC (“Aegis”) regarding the assignment and assumption of certain maintenance agreements, the purchase and sale of certain assets, and related matters (the “Agreement”) pursuant to which we agreed to assume Aegis’ rights and obligations arising on or after April 1, 2023 (the anticipated closing date) under Maintenance Agreements for 202 cogeneration systems, and acquire certain vehicles and inventory used in connection with the performance of maintenance services.
Recent Developments Assumption of Aegis Energy Services Maintenance Agreements On March 15, 2023, we entered into an agreement ("Agreement") with Aegis Energy Services, LLC (“Aegis”) pursuant to which Aegis agreed to assign to us and we agreed to assume certain Aegis maintenance agreements, we agreed to purchase certain assets, and related matters (“Acquisition”). On April 1, 2023, the Acquisition closed.
Our products are sold with our patented Ultera® technology which nearly eliminates all criteria pollutants such as NOx and CO. Our systems are greater than 88% efficient compared to typical electrical grid efficiencies of 40% to 50%. As a result, our greenhouse gas (GHG) emissions are typically half that of the electrical grid.
Our systems are greater than 88% efficient compared to typical electrical grid efficiencies of 40% to 50%. As a result, our greenhouse gas (GHG) emissions are typically half that of the electrical grid. Our systems generate electricity and hot water or in the case of our Tecochill product, both chilled water and hot water.
We also work with building owners directly, in some limited cases offering a full turn-key installation. Our cogeneration, heat pump, and chiller modules are built to order and revenue is recognized upon shipment.
In most cases we work with consulting engineers who specify our product in new and retrofit applications. Our cogeneration, heat pump, and chiller modules are built to order and revenue is recognized upon shipment.
Our services gross margin was 54.2% in 2022 compared to 51.0% in 2021, an increase of 3.2%, due to lower installation services revenue. Energy Production Cost of sales for energy production for the year ended December 31, 2022 was $996,990 compared to $1,074,421 in 2021, a decrease of $77,431.
Energy Production Cost of sales for energy production for the year ended December 31, 2023 was $1,105,503 compared to $996,990 in 2022, an increase of $108,513. Energy production gross margin was 37.1% in 2023 compared to 44.2% in 2022, a decrease of 7.1%, primarily due to increased fuel and maintenance costs.
Table of Contents Seasonality We expect that the majority of our heating systems sales will be operational for the winter and the majority of our chilling systems sales will be operational for the summer. Our cogeneration sales are not generally affected by the seasons. Our service team does experience higher demand in the warmer months when cooling is required.
Future minimum finance lease payments as of December 31, 2023, were $200,187. Seasonality We expect that the majority of our heating systems sales will be operational for the winter and the majority of our chilling systems sales will be operational for the summer. Our cogeneration sales are not generally affected by the seasons.
Our overall gross margin was 44.3% in 2022 compared to 47.5% in 2021, a decrease of 3.2%. Products Costs of sales for products in 2022 was $7,413,320 compared to $5,601,046 in 2021, an increase of $1,812,274, or 32.4%, due to increased product revenue volume and higher material costs.
The increase in cost of sales is due to increased Services revenue volume, the impact of inflation on our material costs, an increase in the provision for obsolete inventory and increased product warranty costs. Our overall gross margin was 40.6% in 2023 compared to 44.3% in 2022, a decrease of 3.7%.
Contractual Obligations and Commitments We are obligated under operating leases for our Waltham, Massachusetts headquarters through March 31, 2024, and our eleven leased service centers through January 2031. Future minimum lease commitments under non-cancellable operating leases as of December 31, 2022 were $1,311,041. See Note 13. "Leases.” 32 TECOGEN INC.
The proceeds of the loans are expected to be used for general working capital purposes. Contractual Obligations and Commitments We are obligated under operating leases for our Waltham, Massachusetts headquarters through March 31, 2024, our new Billerica, Massachusetts headquarters through December 31, 2029 and our eleven leased service centers through January 2031.
Operating Expenses Operating expenses increased in 2022 to $13,415,952 compared to $12,806,745 in 2021, an increase of $609,207 or 4.8%. 30 TECOGEN INC.
Operating Expenses Operating expenses increased in 2023 to $14,615,230 compared to $13,415,952 in 2022, an increase of $1,199,278 or 8.9%.
(9.8) % 15.1 % The following table presents revenue by segment and the change from the prior year for the years ended December 31, 2022 and 2021: Years Ended Revenues December 31, 2022 December 31, 2021 Increase (Decrease) $ Increase (Decrease) % Product: Cogeneration $ 5,279,569 $ 3,264,313 $ 2,015,256 61.7 % Chillers 5,034,633 5,723,157 (688,524) (12.0) % Engineered Accessories 841,897 1,145,859 (303,962) (26.5) % Total product revenue 11,156,099 10,133,329 1,022,770 10.1 % Service: Service contracts 12,060,404 11,586,763 473,641 4.1 % Installations 257 938,831 (938,574) (100.0) % Total service revenue 12,060,661 12,525,594 (464,933) (3.7) % Energy production 1,785,854 1,739,150 46,704 2.7 % Total Revenue $ 25,002,614 $ 24,398,073 $ 604,541 2.5 % Revenues Revenues in 2022 were $25,002,614 compared to $24,398,073 in 2021, an increase of $604,541 or 2.5% due to increased Product revenues. 29 TECOGEN INC.
(18.3) % (9.8) % The following table presents revenue by segment and the change from the prior year for the years ended December 31, 2023 and 2022: Years Ended Revenues December 31, 2023 December 31, 2022 Increase (Decrease) $ Increase (Decrease) % Product: Cogeneration $ 2,761,667 $ 5,279,569 $ (2,517,902) (47.7) % Chillers 5,303,978 5,034,633 269,345 5.3 % Engineered Accessories 794,301 841,897 (47,596) (5.7) % Total product revenue 8,859,946 11,156,099 (2,296,153) (20.6) % Services 14,523,054 12,060,661 2,462,393 20.4 % Energy production 1,756,419 1,785,854 (29,435) (1.6) % Total Revenue $ 25,139,419 $ 25,002,614 $ 136,805 0.5 % Revenues Revenues in 2023 were $25,139,419 compared to $25,002,614 in 2022, an increase of $136,805 or 0.5% due to increased Services revenues which were offset by decreased Products revenues.
Controlled Environment Agriculture: NetZero Greens On July 20, 2022, we announced the establishment of NetZero Greens, a new business unit focused on low carbon Controlled Environment Agriculture (CEA). We believe that CEA offers an exciting opportunity to apply our expertise in clean 25 TECOGEN INC.
Controlled Environment Agriculture On July 20, 2022, we announced our intention to focus on opportunities for low carbon Controlled Environment Agriculture ("CEA"). We believe that CEA offers an exciting opportunity to apply our expertise in clean cooling, power generation, and greenhouse gas reduction to address critical issues affecting food and energy security.
Our products gross margin was 33.5% in 2022 compared to 44.7% in 2021, a decrease of 11.2%, due primarily to the impact of inflation on our material costs. Services Cost of sales for services in 2022 was $5,525,493 compared to $6,134,953 in 2021, a decrease of $609,460, or 9.9%, due to decreased installation activities.
Our products gross margin was 33.1% in 2023 compared to 33.5% in 2022, a decrease of 0.4%, due primarily to the impact of inflation on our material costs and an increase in the provision for obsolete inventory.
For the year ended December 31, 2022, other income (expense) includes interest and other expense of $34,713 and net interest expense of $16,255, which is partially offset by unrealized income on marketable securities of $18,749.
Other Income (Expense), net Other expense, net, for the year ended December 31, 2023 was $77,053 compared to income of $32,219 for the same period in 2022, a decrease of $44,834, due to an increase in interest and other expense of $61,003 compared to $34,713 in 2022, and by a decrease in unrealized income on marketable securities of $18,749, which represents the market value fluctuation of marketable equity securities as discussed in Note 16.
Included in working capital were cash and cash equivalents of $1,913,969 at December 31, 2022, compared to $3,614,463 at December 31, 2021, a decrease of $1,700,494 or 47.0%. The decrease in consolidated working capital is primarily due to the second draw Paycheck Protection Program loan forgiveness and positive cash flow from operations in 2021.
Included in working capital were cash and cash equivalents of $1,351,270 at December 31, 2023, compared to $1,913,969 at December 31, 2022, a decrease of $562,699 or 29.4%. The decrease in consolidated working capital is primarily due to the increase in our net loss and increased liabilities recognized due to the Aegis contract acquisition.
These include natural gas engine driven combined heat and power (CHP) systems, chillers and heat pumps for multi-family residential, commercial, recreational and industrial use. We are known for products that provide customers with substantial energy savings, resiliency from utility power outages and for significantly reducing a customer’s carbon footprint.
We are known for products that provide customers with substantial energy savings, resiliency from utility power outages and for significantly reducing a customer’s carbon footprint. Our products are sold with our patented Ultera® technology which nearly eliminates all criteria pollutants such as NOx and CO.
Accounts Receivable Accounts receivable are stated at the amount management expects to collect from outstanding balances. An allowance for doubtful accounts is provided for those accounts receivable considered to be uncollectible based upon historical experience and management’s evaluation of outstanding accounts receivable at the end of the year.
Accounts Receivable Accounts receivable are stated at the amount management expects to collect from outstanding balances.
Accounts payable decreased by $246,401 from December 31, 2021 to December 31, 2022. Accrued expenses from operations decreased by $109,282 as of December 31, 2022 compared to December 31, 2021 due to lower operating expenses. Deferred revenues decreased by $678,758 as of December 31, 2022 as compared to December 31, 2021.
Accrued expenses from operations increased by $128,869 as of December 31, 2023 compared to December 31, 2022 due to higher operating expenses. Deferred revenues increased by $543,842 as of December 31, 2023 as compared to December 31, 2022, due to Aegis contract customer deposits collected in 2023 .
At December 31, 2022 and 2021, we had cash and cash equivalents of $1,913,969 and $3,614,463, a decrease of $1,700,494 or 47.0%.
Backlog does not include maintenance contract service revenues or energy contract revenues. At December 31, 2023 and 2022, we had cash and cash equivalents of $1,351,270 and $1,913,969, a decrease of $562,699 or 29.4%.
Table of Contents Years Ended Increase (Decrease) December 31, 2022 December 31, 2021 $ % Operating Expenses General and administrative 10,909,251 9,795,823 $ 1,113,428 11.4 % Selling 1,811,085 2,471,929 (660,844) (26.7) % Research and development 732,873 542,079 190,794 35.2 % Gain on sale of assets (41,931) (10,486) (31,445) 299.9 % Long-lived asset impairment 4,674 7,400 (2,726) (36.8) % Total $ 13,415,952 $ 12,806,745 $ 609,207 4.8 % General and administrative expenses increased $1,113,428 to $10,909,251 in the year ended December 31, 2022 compared to $9,795,823 in 2021 due primarily to a $311,710 increase in freight and other related costs, a $206,006 increase in payroll costs, a $150,000 provision for litigation, a $131,719 increase in stock-based compensation, a $124,403 increase in franchise taxes, a $122,497 increase in professional fees and a $76,370 increase in travel related expenses.
Years Ended Increase (Decrease) December 31, 2023 December 31, 2022 $ % Operating Expenses General and administrative 11,880,389 $ 10,909,251 $ 971,138 8.9 % Selling 1,931,037 1,811,085 119,952 6.6 % Research and development 840,011 732,873 107,138 14.6 % Gain on sale of assets (36,207) (41,931) 5,724 (13.7) % Long-lived asset impairment — 4,674 (4,674) (100.0) % Total $ 14,615,230 $ 13,415,952 $ 1,199,278 8.9 % General and administrative expenses increased $971,138 to $11,880,389 in the year ended December 31, 2023 compared to $10,909,251 in 2022 due primarily to a $974,420 increase in bad debt expense, due mainly to the write down of certain install receivables which were deemed uncollectible, a $139,364 increase in amortization and depreciation, due to the Aegis acquisition, a $164,415 increase in business insurance, partially offset by a $83,758 decrease in stock-based compensation, a $68,470 decrease in franchise taxes and the $150,000 litigation provision recorded in 2022.
Our product mix, as well as product revenue, can vary significantly from period to period as our products are high dollar, low volume sales in which revenue is recognized upon shipment and to some degree were impacted by COVID-19 as energy and other construction projects were delayed.
Our product mix, as well as product revenue, can vary significantly from period to period as our products are high dollar, low volume sales in which revenue is recognized upon shipment. Services Revenues derived from our service centers, including installation activities, in 2023 were $14,523,054 compared to $12,060,661 for the same period in 2022, an increase of $2,462,393 or 20.4%.
If impairment is indicated, the asset is written down to its estimated fair value.
If impairment is indicated, the asset is written down to its estimated fair value. Business Combinations In accordance with applicable accounting standards, we estimate the fair value of assets acquired and liabilities assumed as of the acquisition date of each business combination.
Table of Contents Products Product revenues in 2022 were $11,156,099 compared to $10,133,329 in 2021, an increase of $1,022,770 or 10.1%.
Products Product revenues in 2023 were $8,859,946 compared to $11,156,099 in 2022, a decrease of $2,296,153 or 20.6%.
During 2021, our cash flows from financing activities were $1,874,269, consisting of the receipt of proceeds from the Second Draw Paycheck Protection Program loan. Our total product and installation backlog as of December 31, 2022 was $6,722,138 million compared to $11,321,043 as of December 31, 2021. Backlog does not include maintenance contract service revenues or energy contract revenues.
Cash flows from financing activities in 2023 were $505,505, consisting of borrowings under our related party note with John N. Hatsopoulos (see Note 11."Related Party Notes"). During 2022, there were no cash flows from financing activities. Our total product and installation backlog as of December 31, 2023 was $7,388,145 compared to $6,722,138 as of December 31, 2022.