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Tennessee (US-TN)

Market Type: Deregulated (Retail Choice)
SSS Relevance: ⭐⭐⭐ High
Grid Carbon Intensity: ~308 gCO₂/kWh

SSS Factors: significant nuclear capacity, hydroelectric resources, no mandatory RPS

1. Overview​

Tennessee operates a regulated electricity market dominated by the Tennessee Valley Authority (TVA), a federally owned corporation that controls over 90% of the state's generation capacity 1. The state lacks retail choice; consumers cannot select their electricity supplier, as service is determined by geographical location and distributed through 153 local power companies 1.

As of 2024, the generation mix is diverse, with nuclear power serving as the primary baseload source at 42% of total generation 2. Fossil fuels account for approximately 44% of generation (split evenly between natural gas and coal), though TVA plans to retire remaining coal plants by 2031 2. Renewables comprise roughly 13% to 14% of in-state generation, driven almost entirely by hydroelectric power (~12%), with solar contributing ~1.5% and wind less than 0.1% 2.

Tennessee benefits from electricity rates lower than the national average, with residential bills averaging between $143 and $155 monthly 3. However, the state is a net energy importer, consuming nearly four times more energy than it produces and importing approximately one-third of its electricity supply from neighboring states 2. Despite high usage of electricity for heating (over 60% of households), the grid carbon intensity is approximately 804 lbs of CO2 per MWh (368 gCO2eq/kWh), which is about 24% cleaner than the national average due to the significant share of carbon-free nuclear and hydroelectric resources 4.

Future demand is expected to rise sharply due to population growth and the expansion of data centers and AI facilities. In response, TVA is developing 5,500 MW of new generation capacity and exploring small modular nuclear reactors near Oak Ridge 2.

2. Market Structure​

Tennessee operates a fully regulated electricity market with no retail choice for residential or commercial customers. Consumers must purchase power from their designated local utility, which typically functions as a regulated monopoly controlling generation, transmission, and distribution 5.

The state's electricity system is not managed by an Independent System Operator (ISO) or Regional Transmission Organization (RTO). Instead, the Tennessee Valley Authority (TVA), a federally owned corporation, acts as the primary balancing authority and transmission owner for nearly all of the state. While TVA coordinates with neighboring RTOs such as MISO for emergency energy exchange, it retains operational control of its assets 6.

The utility landscape is dominated by public and consumer-owned entities rather than traditional investor-owned utilities (IOUs). Most municipal and cooperative utilities do not generate their own power; they act as Local Power Companies (LPCs) that purchase wholesale electricity from TVA for distribution 7. The Tennessee Public Utility Commission (TPUC) serves as the primary regulatory body overseeing investor-owned utilities in the state 5.

Tennessee explored electric industry restructuring in the past, notably through a Joint Study Committee in 1998 and subsequent reports by the Office of Research and the Tennessee Advisory Commission on Intergovernmental Relations (TACIR) in 2000–2001. However, following the California energy crisis and other market challenges in the early 2000s, the state decided not to pursue deregulation 8.

3. Clean Energy Policy​

Tennessee does not have a statewide mandatory Renewable Portfolio Standard (RPS), net-zero goal, or specific mandate requiring a percentage of energy from renewable sources 9. Instead, the state's electricity sector is dominated by the Tennessee Valley Authority (TVA), a federally owned corporation that supplies power to approximately 99.7% of the state and sets its own decarbonization targets 10.

TVA Strategic Goals TVA has established a voluntary roadmap to reduce carbon emissions:

  • 70% reduction by 2030 (from 2005 levels).
  • 80% reduction path by 2035.
  • Net-zero emissions aspiration by 2050 11. As of 2021, TVA reported a 57% reduction in mass carbon emissions since 2005 12. However, in early 2026, the TVA Board voted to delay the retirement of two major coal plants (Kingston and Cumberland) to meet a projected 50% to 100% increase in energy demand 12.

Legislative Framework and Definitions Recent state legislation has focused on defining clean energy and limiting local government control:

  • Redefinition of Natural Gas: Legislation signed in 2023 (SB 608/HB 719) legally redefined natural gas as "clean energy" 13.
  • Local Ordinance Restrictions: HB 1143 / SB 1389 (2025 Updates) requires local ordinances regarding "clean," "green," or "renewable" energy to adhere to a specific list of 19 permissible sources 13.
  • Building Codes: HB 799/SB 1377 (2023) prevents cities from enacting building energy codes stricter than state standards 13.
  • Data Center Mandate: HB 2463 requires data centers or AI facilities with peak loads over 100MW to derive 50% of electricity from new, carbon-free sources onsite or via direct interconnection, effective July 1, 2026 14.

Incentives and Local Initiatives The state utilizes financial incentives rather than mandates, including a Certified Green Energy Production Facility tax credit 10. While the state lacks an RPS, local governments such as Nashville (Ordinance BL2019-1600) have established their own renewable standards 9.

4. Utility Landscape​

Tennessee's energy landscape is unique, dominated by the Tennessee Valley Authority (TVA), a federal corporation that generates nearly all of the state's power [1]. TVA sells electricity at wholesale to 153 local power companies (LPCs) which directly serve end-use customers [2]. The distribution sector is characterized by a high prevalence of not-for-profit entities, comprising 60 municipal utilities and 22 electric cooperatives [3].

Major Local Distributors The largest utilities in the state include:

  • Memphis Light, Gas and Water (MLGW): The largest three-service public utility in the U.S., serving Memphis and Shelby County [2].
  • Nashville Electric Service (NES): One of the 12 largest public electric utilities in the nation, serving over 400,000 customers in Middle Tennessee [2].
  • Knoxville Utilities Board (KUB): Provides electric, gas, water, and wastewater services to Knoxville [2].
  • Chattanooga EPB: Serves the greater Chattanooga area and is known for its community-wide fiber-optic network [2].
  • Middle Tennessee Electric (MTE): The largest electric cooperative in the state [2].

Investor-Owned Utilities (IOUs) IOUs represent a small portion of the market, serving specific regions:

  • Electric: Kingsport Power Company (dba AEP Appalachian Power), Appalachian Power Company (an affiliate of American Electric Power), and Entergy Arkansas, LLC (operating small portions of service territory) [1].
  • Natural Gas: Major providers include Atmos Energy Corporation, Piedmont Natural Gas (a subsidiary of Duke Energy), Chattanooga Gas Company (a subsidiary of Southern Company), and Navitas TN NG, LLC [1].
  • Water & Wastewater: Includes Tennessee-American Water Company and Tennessee Wastewater Systems, Inc. (TWSI) [1].

Generation Assets Key generation sites within the state include the Watts Bar Nuclear Plant and Sequoyah Nuclear Plant (carbon-free), 29 TVA-operated hydroelectric dams, and major fossil plants such as the Cumberland Fossil Plant and Kingston Fossil Plant [2].

5. SSS-Eligible Resources​

ResourceTypeCapacity (MW)SSS EligibleNotes
Large Hydroelectric (aggregate)Hydro9,783✅ Yes (pre-RPS)Legacy hydro facilities
conventionalHydro5,400✅ Yes (pre-RPS)Legacy hydro

6. EAC/REC Registry Infrastructure​

Tennessee does not operate a state-specific Renewable Energy Certificate (REC) tracking system. Instead, the state utilizes regional and national registries to manage Energy Attribute Certificates (EACs) and prevent double-counting of environmental attributes.

Primary Tracking Systems​

  • North American Renewables Registry (NAR): Operated by APX, NAR serves as the default tracking system for Tennessee and the broader Southeastern United States. It facilitates the issuance, trading, and retirement of RECs for both voluntary and compliance markets 15 16.
  • CleanCounts (formerly M-RETS): While historically focused on the Midwest, CleanCounts functions as a national registry that allows for the registration of generators located anywhere in the U.S., including Tennessee 17.
  • PJM-GATS: Although primarily serving the PJM Interconnection region, this system may be used by generators in adjacent areas like Tennessee depending on specific utility or contractual requirements 18.

Utility and State Programs​

  • Tennessee Valley Authority (TVA): As the primary power provider for the region, TVA manages internal tracking for voluntary renewable programs, such as Green Switch. These programs often interface with larger registries and seek third-party certification from Green-e Energy 15 16.
  • TDEC Certification: The Tennessee Department of Environment and Conservation (TDEC) offers a "Certified Green Energy Production Facility" designation. This state-level certification is distinct from REC tracking but is required for facilities applying for the Green Energy Production Facility Sales and Use Tax Exemption 10.

Tracking Mechanisms​

These systems assign a unique serial number to every megawatt-hour (MWh) of renewable energy generated. Once a certificate is "retired" to verify a claim, it cannot be sold or claimed again, ensuring transparency 19.

7. Grid Emissions​

Generation Mix​

Source: EPA eGRID, EIA, state regulatory filings

References​

Sources & Last Updated​

Research Date: 2026-03-10
Data Sources: EIA, EPA eGRID, state regulatory filings, SerpAPI research aggregation

This page was generated using automated research and may contain inaccuracies. Verify critical data with primary sources.

Footnotes​

  1. EnergySage ↩ ↩2

  2. U.S. Energy Information Administration (EIA) ↩ ↩2 ↩3 ↩4 ↩5

  3. Southern Alliance for Clean Energy ↩

  4. Public Power Review ↩

  5. Quick Electricity ↩ ↩2

  6. Energy Star (.gov) ↩

  7. NARUC ↩

  8. National Laboratory of the Rockies (NLR) (.gov) ↩

  9. Database of State Incentives for Renewables & Efficiency ↩ ↩2

  10. TN.gov ↩ ↩2 ↩3

  11. Tennessee Valley Authority ↩

  12. State Climate Policy Dashboard ↩ ↩2

  13. WPLN News ↩ ↩2 ↩3

  14. Sabin Center for Climate Change Law ↩

  15. resource-solutions.org ↩ ↩2

  16. Xpansiv ↩ ↩2

  17. CleanCounts ↩

  18. CnerG ↩

  19. National Laboratory of the Rockies (NLR) ↩