Biggest changeSee also Item 1A, Risk Factors — Operational Risks and Risks Related to the Environment and Catastrophic Events. 55 Table of Contents The following table summarizes TVA's summer net capability in MW at September 30, 2022: SUMMER NET CAPABILITY At September 30, 2022 Source of Capability Location Number of Units Summer Net Capability (MW) Date First Unit Placed in Service (CY) Date Last Unit Placed in Service (CY) TVA-Operated Generating Facilities Nuclear Browns Ferry Alabama 3 3,662 1974 1977 Sequoyah Tennessee 2 2,292 1981 1982 Watts Bar Tennessee 2 2,278 1996 2016 Total Nuclear 7 8,232 Coal-Fired Bull Run Tennessee 1 765 1967 1967 Cumberland Tennessee 2 2,470 1973 1973 Gallatin Tennessee 4 976 1956 1959 Kingston Tennessee 9 1,298 1954 1955 Shawnee Kentucky 9 1,071 1953 1955 Total Coal-Fired 25 6,580 Natural Gas and/or Oil-Fired (1)(2) Simple-Cycle Combustion Turbine Allen (3) Tennessee 20 287 1971 1972 Brownsville Tennessee 4 438 1999 1999 Colbert Alabama 8 360 1972 1972 Gallatin Tennessee 8 580 1975 2000 Gleason Tennessee 3 455 2000 2000 Johnsonville Tennessee 19 1,028 1975 2000 Kemper Mississippi 4 292 2002 2002 Lagoon Creek Tennessee 12 884 2001 2002 Marshall County Kentucky 8 592 2002 2002 Subtotal Simple-Cycle Combustion Turbine 86 4,916 Combined-Cycle Combustion Turbine Ackerman (4) Mississippi 1 713 2007 2007 Allen (5) Tennessee 1 1,106 2018 2018 Caledonia (6) Mississippi 3 765 2003 2003 John Sevier (7) Tennessee 1 871 2012 2012 Lagoon Creek (8) Tennessee 1 525 2010 2010 Magnolia Mississippi 3 918 2003 2003 Paradise (9) Kentucky 1 1,100 2017 2017 Southaven Mississippi 3 780 2003 2003 Subtotal Combined-Cycle Combustion Turbine 14 6,778 Co-Generation Johnsonville Tennessee 1 83 1975 2000 Total Natural Gas and/or Oil-Fired 101 11,777 Hydroelectric Conventional Plants Alabama 36 1,176 1925 1962 Georgia 2 35 1931 1956 Kentucky 5 223 1944 1948 North Carolina 6 492 1940 1956 Tennessee (3)(10) 60 1,828 1912 1972 Pumped-Storage (11) Tennessee 4 1,654 1978 1979 Total Hydroelectric 113 5,408 Diesel Generator Meridian Mississippi 5 9 1998 1998 TVA Non-hydro Renewable Resources (12) 1 TVA Other Nonrenewable Resources (12) 5 Total TVA-Operated Generating Facilities 32,012 Contract Renewable Resources (13) 324 Power Purchase and Other Agreements - Renewable (14) 2,157 Power Purchase and Other Agreements - Nonrenewable (14) 3,618 Total Summer Net Capability 38,111 56 Table of Contents Notes (1) See Generating Properties above for a discussion of TVA-operated natural gas and/or oil-fired facilities subject to leaseback and long-term lease arrangements.
Biggest changeSee Item 1, Business — Power Supply and Load Management Resources — Power Purchase and Other Agreements for information on TVA's renewable and nonrenewable power purchase contracts by resource type and location. 58 Table of Contents The following table summarizes TVA's summer net capability in MW at September 30, 2023: SUMMER NET CAPABILITY At September 30, 2023 Source of Capability Location Number of Units Summer Net Capability (MW) Date First Unit Placed in Service (CY) Date Last Unit Placed in Service (CY) TVA-Operated Generating Facilities Nuclear Browns Ferry Alabama 3 3,662 1974 1977 Sequoyah Tennessee 2 2,292 1981 1982 Watts Bar Tennessee 2 2,278 1996 2016 Total Nuclear 7 8,232 Coal-Fired Cumberland Tennessee 2 2,470 1973 1973 Gallatin Tennessee 4 976 1956 1959 Kingston Tennessee 9 1,298 1954 1955 Shawnee Kentucky 9 1,071 1953 1955 Total Coal-Fired 24 5,815 Natural Gas and/or Oil-Fired (1)(2) Simple-Cycle Combustion Turbine Allen (3) Tennessee 20 287 1971 1972 Brownsville Tennessee 4 438 1999 1999 Colbert Alabama 11 1,041 1972 2023 Gallatin Tennessee 8 580 1975 2000 Gleason Tennessee 3 455 2000 2000 Johnsonville Tennessee 19 1,028 1975 2000 Kemper Mississippi 4 292 2002 2002 Lagoon Creek Tennessee 12 884 2001 2002 Marshall County Kentucky 8 592 2002 2002 Subtotal Simple-Cycle Combustion Turbine 89 5,597 Combined-Cycle Combustion Turbine Ackerman (4) Mississippi 1 713 2007 2007 Allen (5) Tennessee 1 1,106 2018 2018 Caledonia (6) Mississippi 3 819 2003 2003 John Sevier (7) Tennessee 1 871 2012 2012 Lagoon Creek (8) Tennessee 1 596 2010 2010 Magnolia Mississippi 3 951 2003 2003 Paradise (9) Kentucky 1 1,100 2017 2017 Southaven Mississippi 3 802 2003 2003 Subtotal Combined-Cycle Combustion Turbine 14 6,958 Co-Generation Johnsonville Tennessee 1 83 1975 2000 Total Natural Gas and/or Oil-Fired 104 12,638 Hydroelectric Conventional Plants Alabama 36 1,159 1925 1962 Georgia 2 37 1931 1956 Kentucky 5 225 1944 1948 North Carolina 6 473 1940 1956 Tennessee (3)(10) 60 1,845 1912 1972 Pumped-Storage (11) Tennessee 4 1,700 1978 1979 Total Hydroelectric 113 5,439 Diesel Generator Meridian Mississippi 5 9 1998 1998 TVA Non-hydro Renewable Resources (12) 1 TVA Other Nonrenewable Resources (12) 5 Total TVA-Operated Generating Facilities Summer Net Capability 32,139 Notes (1) See Generating Properties above for a discussion of TVA-operated natural gas and/or oil-fired facilities subject to leaseback and long-term lease arrangements.
Additionally, TVA manages over 150 agreements for commercial recreation (such as campgrounds and marinas). As part of its stewardship responsibilities, TVA approval is required to be obtained before any obstruction affecting navigation, flood control, or public lands can be constructed in or along the Tennessee River and its tributaries.
Additionally, TVA manages over 150 agreements for commercial recreation (such as campgrounds and marinas). As part of its stewardship responsibilities, TVA approval is required to be obtained before any obstruction affecting navigation, flood control, or public lands can be constructed across, along, or in the Tennessee River and its tributaries.
The Basic Tennessee Valley Authority Power Bond Resolution adopted by the TVA Board on October 6, 1960, as amended on September 28, 1976, October 17, 1989, and March 25, 1992 (the "Basic Resolution") prohibits TVA (1) from mortgaging any part of its power properties and (2) from disposing of all or any substantial portion of these properties unless TVA provides for a continuance of the interest, principal, and sinking fund payments due and to become due on all outstanding Bonds, or for the retirement of such Bonds. 57 Table of Contents
The Basic Tennessee Valley Authority Power Bond Resolution adopted by the TVA Board on October 6, 1960, as amended on September 28, 1976, October 17, 1989, and March 25, 1992 (the "Basic Resolution") prohibits TVA (1) from mortgaging any part of its power properties and (2) from disposing of all or any substantial portion of these properties unless TVA provides for a continuance of the interest, principal, and sinking fund payments due and to become due on all outstanding Bonds, or for the retirement of such Bonds. 60 Table of Contents
(9) Paradise Combined Cycle Facility is a single steam cycle unit driven by three gas turbines (3x1 configuration). (10) Includes 86 MW of summer net capability associated with Hiwassee Hydro Unit 2. See Item 1, Business — Power Supply and Load Management Resources — Conventional Hydroelectric Dam s.
(9) Paradise Combined Cycle Facility is a single steam cycle unit driven by three gas turbines (3x1 configuration). (10) Includes 86 MW of summer net capability associated with Hiwassee Hydro Unit 2. See Item 1, Business — Power Supply and Load Management Resources — Renewable Energy Resources — Conventional Hydroelectric Dam s.
(3) As of September 30, 2022, TVA had five idled units at Allen Combustion Turbine Facility: Units 2, 3, 11, 17, and 18 and three units that were in long-term outage and unavailable for service at Wilbur Hydroelectric Facility: Units 1-3.
(3) As of September 30, 2023, TVA had five idled units at Allen Combustion Turbine Facility (Units 2, 3, 11, 17, and 18) and three units that were in long-term outage and unavailable for service at Wilbur Hydroelectric Facility (Units 1-3).
These units are included in their respective locations in the table above; however, the capability from these units is excluded. (4) Ackerman Combined Cycle Facility is a single steam cycle unit driven by two gas turbines (2x1 configuration). (5) Allen Combined Cycle Facility is a single steam cycle unit driven by two gas turbines (2x1 configuration).
These units are included in their respective locations in the table above; however, the capability from these units is excluded. (4) Ackerman Combined Cycle Facility is a single steam cycle unit driven by two gas turbines (2x1 configuration). 59 Table of Contents (5) Allen Combined Cycle Facility is a single steam cycle unit driven by two gas turbines (2x1 configuration).
(2) As of September 30, 2022, 326 MW of peak firing short-term capability of simple-cycle combustion turbine units was not operational and would require additional investment for dependable use; therefore, this short-term capability is not presented in the table above.
(2) As of September 30, 2023, 137 MW of peak firing short-term capability of simple-cycle combustion turbine units was not operational and would require additional investment for dependable use; therefore, this short-term capability is not presented in the table above.
It does not include real-time bulk electrical system operating constraints such as transmission line loading limitations, fuel availability such as coal, gas, and seasonal river reservoir levels, fuel blend, severe weather events, intermittency of renewable resources associated with weather and other factors, environmental and/or other regulatory constraints, transmission system outages, generator outages, or generator derates.
It does not include real-time bulk electrical system operating constraints such as transmission line loading limitations, fuel availability such as coal, gas, and seasonal river reservoir levels, fuel blend, severe weather events, environmental and/or other regulatory constraints, transmission system outages, generator outages, or generator derates.
(11) See Item 1, Business — Power Supply and Load Management Resources — Raccoon Mountain Pumped-Storage Plant for a discussion of Raccoon Mountain Pumped-Storage Plant. (12) TVA owns approximately one MW of renewable solar capability among 13 solar installations and Allen Combined Cycle Facility has five MW of nonrenewable biomass capability that came online in 2022.
(11) See Item 1, Business — Power Supply and Load Management Resources — Hydroelectric Pumped-Storage for a discussion of Raccoon Mountain Pumped-Storage Plant. (12) TVA owns approximately one MW of renewable solar capability among nine operating solar installations, and Allen Combined Cycle Facility has five MW of nonrenewable biomass capability.
Generating Properties At September 30, 2022, TVA-operated generating assets consisted of seven nuclear units, 25 active coal-fired units, 86 simple-cycle units (81 active units and five idled units), one cogeneration unit, 14 combined-cycle power blocks, 109 conventional hydroelectric units (106 active units and three units in long-term outage and unavailable for service), four pumped-storage hydroelectric units, five diesel generator units, and 13 solar installations.
Generating Properties At September 30, 2023, TVA-operated generating assets consisted of seven nuclear units, 24 active coal-fired units, 89 simple-cycle units (84 active units and five idled units), one cogeneration unit, 14 combined-cycle power blocks, 109 conventional hydroelectric units (106 active units and three units in long-term outage and unavailable for service), four pumped-storage hydroelectric units, five diesel generator units, and nine operating solar installations.
Transmission Properties TVA's transmission system interconnects with systems of surrounding utilities and, at September 30, 2022, consisted primarily of approximately 2,500 circuit miles of 500 kilovolt, 11,900 circuit miles of 161 kilovolt, and 2,000 circuit miles of other voltage transmission lines; 4,412 miles of fiber optic lines; 534 transmission substations, power switchyards, and switching stations; and 1,341 customer connection points (customer, generation, and interconnection).
Transmission Properties TVA's transmission system interconnects with systems of surrounding utilities and, at September 30, 2023, consisted primarily of approximately 2,500 circuit miles of 500 kilovolt, 11,900 circuit miles of 161 kilovolt, and 1,900 circuit miles of other voltage transmission lines; 5,113 miles of fiber optic lines; 573 transmission substations, power switchyards, and switching stations; and 1,355 customer connection points (customer, generation, and interconnection).
These public lands and waters managed by TVA provide both conservation and responsible recreation. Buildings TVA has a variety of buildings and structures located throughout its service area including generation and transmission facilities, corporate offices, customer service centers, power service centers, warehouses, visitor centers, and crew quarters.
These public lands and waters managed by TVA provide both conservation and sustainable recreation. Buildings TVA has buildings and structures located throughout its service area to support TVA's mission of service. These buildings and structures include generation and transmission facilities, corporate offices, customer service centers, power service centers, warehouses, visitor centers, and crew quarters.
As of September 30, 2022, eight of the simple-cycle CTs and four of the combined-cycle power blocks were leased to special purpose entities ("SPEs") and leased back to TVA under long-term leases. See Note 11 — Variable Interest Entities and Note 14 — Debt and Other Obligations — Lease/Leasebacks .
As of September 30, 2023, four of the combined-cycle power blocks were leased to special purpose entities ("SPEs") and leased back to TVA under long-term leases. See Note 11 — Variable Interest Entities and Note 14 — Debt and Other Obligations — Lease/Leasebacks . In addition, TVA is leasing the three Caledonia combined-cycle power blocks under a long-term lease.
Summer net capability as presented in the table below reflects the expected output of individual resources at TVA’s anticipated summer demand peak. The summation of those individual resources does not include the real-time bulk electrical system operating constraints previously noted.
Summer net capability as presented in the table below reflects the expected output of individual resources at TVA’s anticipated summer demand peak. The summation of those individual resources does not include the real-time bulk electrical system operating constraints previously noted. See also Item 1A, Risk Factors — Operational Risks and Risks Related to the Environment and Catastrophic Events.
Net Capability Net capability is defined as the ability of an electric system, generating unit, or other system component to carry or generate power for a specified time period.
For a discussion of these assets, see Item 1, Business — Power Supply and Load Management Resources . Net Capability Net capability is defined as the ability of an electric system, generating unit, or other system component to carry or generate power for a specified time period.
Two significant buildings are its Knoxville Office Complex and the Chattanooga Office Complex ("COC") in Tennessee. TVA continues to study its real property portfolio as part of the Strategic Real Estate Plan, which is aimed at reducing cost, right-sizing the portfolio, and aligning real estate holdings with TVA's strategic direction.
Two significant buildings are its Knoxville Office Complex and the Chattanooga Office Complex ("COC") in Tennessee. TVA engages in ongoing Tennessee Valley-wide real property portfolio evaluations of buildings, structures, and land as part of the strategic real estate program, which focuses on reducing cost, right-sizing the portfolio, and aligning real estate holdings with TVA's strategic direction.
In addition, as a result of the COVID-19 pandemic, TVA continues to assess a hybrid work environment for those who do not have to be physically present at TVA offices. TVA is also assessing and reviewing the pandemic's long-term impacts to the real property portfolio, including the COC.
In addition, TVA continues to operate in a hybrid work environment for those who do not have to be physically present at a TVA facility. See Part II, Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations — Key Initiatives and Challenges — Real Property Portfolio .