What the Tennessee Valley Authority is and why it matters to you

The Tennessee Valley Authority, or TVA, is a federal agency that generates and sells electricity across a nine-state region in the Southeast — Tennessee, Kentucky, Mississippi, Alabama, Georgia, North Carolina, Virginia, and West Virginia. Unlike most power companies, TVA is owned by the federal government, not by shareholders. It operates dams, coal plants, nuclear plants, and solar farms, and it sells the power it generates to local utility companies, which then bill you for what you use.

If you live in this region and your power bill comes from a company like Nashville Electric Service, Memphis Light Gas and Water, or any of the 155 local utilities that buy from TVA, then TVA is your wholesale power supplier — even if you've never heard the name. Your local utility handles your bill and customer service; TVA handles the generation and transmission of the power itself. Understanding this split matters when you're looking at your bill, thinking about energy costs, or wondering why rates change.

TVA was created in 1933 as part of the New Deal and was originally designed to control flooding, improve navigation on the Tennessee River, and bring electricity to a region that had almost none. Today it still operates the largest system of dams in the United States, which is why hydroelectric power remains a significant part of its energy mix — though it now also relies on nuclear power, natural gas, and renewable sources.

Key Takeaways

  • TVA is a federal agency that generates electricity for nine southeastern states and sells it wholesale to 155 local utility companies that bill you directly.
  • TVA operates the largest dam system in the United States, which produces hydroelectric power alongside nuclear, natural gas, and renewable energy sources.
  • Your power bill comes from your local utility, not from TVA, but TVA's costs and decisions affect the rates your local utility charges you.
  • TVA rates vary by location and season because different local utilities negotiate different contracts and have different operating costs.
  • TVA publishes its rates and budget publicly, and you can find information about power outages and service in your area through your local utility's website.

How TVA's dam system generates your electricity

TVA operates 29 dams across the Tennessee River and its tributaries. Water flowing through these dams turns turbines that generate electricity — this is hydroelectric power. The dams also store water in reservoirs, which means TVA can release water to generate power when demand is highest, rather than only when rainfall is heaviest. This gives TVA flexibility that many other power companies don't have.

The largest and oldest of these dams is Norris Dam, completed in 1936 in Tennessee. Others include Fontana Dam in North Carolina, Kentucky Dam, and Pickwick Landing Dam. Each dam serves multiple purposes: generating power, controlling floods, allowing barge traffic on rivers, and creating reservoirs for recreation and water supply. Because of this, TVA can't straightforward maximize power generation at all times — it has to balance power production with flood control, navigation, and other uses.

Hydroelectric power makes up roughly 20 to 25 percent of TVA's total generation in most years, though this varies with rainfall. In wet years, more water flows through the dams and TVA generates more hydroelectric power. In dry years, TVA relies more on its nuclear and natural gas plants to meet demand. This is why your power bill may fluctuate slightly by season — TVA's fuel mix changes based on water availability and demand.

What other power sources TVA uses besides dams

TVA operates three nuclear power plants: Sequoyah and Watts Bar in Tennessee, and Browns Ferry in Alabama. These plants run continuously and provide the largest share of TVA's electricity — usually around 40 to 50 percent of total generation. Nuclear power is expensive to build but cheap to run once it's operating, and it produces no carbon emissions.

TVA also operates natural gas plants, which it can turn on and off quickly to match demand. These plants are less efficient than nuclear plants but more flexible. Natural gas typically makes up 15 to 25 percent of TVA's generation. In recent years, TVA has also added solar farms and wind projects, though these still represent a small fraction of total output — usually under 5 percent.

TVA retired its last coal-fired power plant in 2020, which reduced its carbon emissions significantly. This shift toward nuclear, natural gas, and renewables has been one of the largest changes to TVA's operations in decades and has affected rates across the region.

How TVA's rates are set and why they differ by location

TVA sets wholesale rates that it charges to the 155 local utilities that buy its power. These utilities then add their own costs — distribution, customer service, billing, maintenance of local lines — and charge you a retail rate. Your bill reflects both TVA's wholesale cost and your local utility's markup.

TVA's rates are published and available to the public. The agency raises rates periodically to cover the cost of maintaining its dams, operating its plants, and investing in new infrastructure. When TVA raises its wholesale rates, your local utility usually raises its rates too, though the timing and amount vary. Some utilities pass through TVA's increases quickly; others absorb part of the cost for a time.

Rates also differ by location because local utilities have different contracts with TVA and different operating costs. A utility in a rural area may have higher distribution costs than one in a city, which can show up in your bill. Some utilities also offer time-of-use rates, where you pay more during peak hours and less during off-peak hours — this is a local utility decision, not a TVA decision.

Understanding your TVA-supplied power bill

Your power bill from your local utility will not say "TVA" on it unless your local utility is one of the few that uses TVA's name in its own name. Instead, you'll see your local utility's name — Nashville Electric Service, Memphis Light Gas and Water, Knoxville Utilities Board, or another company. The bill will show your usage in kilowatt-hours, your rate per kilowatt-hour, and any additional charges for taxes, fees, or riders.

The "fuel and purchased power" line on your bill is where TVA's wholesale cost shows up. This line fluctuates based on TVA's generation costs, which change with fuel prices, water availability, and maintenance schedules. During months when TVA generates more hydroelectric power, this line may be lower. During months when TVA relies more on natural gas or nuclear power, it may be higher.

If you want to see TVA's actual rates, you can find them on TVA's website under "Rates and Tariffs." These are the wholesale rates TVA charges utilities, not the retail rates you pay. Your local utility's website will show you the retail rates you actually pay.

What to do if you have questions about your power bill or service

Contact your local utility company, not TVA. Your local utility handles billing, customer service, and service requests. You can find your local utility's phone number on your power bill. If you have questions about rates, outages, or service, your local utility is the right place to start.

If you want information about TVA's operations, environmental practices, or long-term plans, TVA's website (tva.gov) has public documents, annual reports, and contact information for different departments. TVA also holds public meetings about rate changes and major projects, and these are open to anyone.

If you're experiencing a power outage, report it to your local utility when ready. Your local utility will contact TVA if the outage is on TVA's transmission system rather than the local distribution system. Most outages are caused by problems on local lines, not on TVA's system, so your local utility is the best source of information about when power will be restored.

How TVA's hydroelectric dams compare to other power sources

Hydroelectric power from TVA's dams produces no air pollution and no carbon emissions. It's also flexible — TVA can increase or decrease output quickly by opening or closing dam gates. This makes hydroelectric power valuable for balancing the grid when demand spikes or when other sources go offline.

The downside is that hydroelectric power depends on rainfall and water availability. In dry years, TVA generates less hydroelectric power and must rely more on other sources. Dams also affect river ecosystems and can displace communities, though TVA's dams were built decades ago and these impacts are now historical rather than current.

Compared to coal power, which TVA has phased out, hydroelectric power is cleaner and more flexible. Compared to nuclear power, which TVA relies on heavily, hydroelectric power is less consistent but doesn't create nuclear waste. Compared to natural gas, hydroelectric power produces no emissions but can't be ramped up as quickly. TVA's mix of all these sources is designed to balance cost, reliability, and environmental impact.

Frequently Asked Questions

Can I choose a different power company if I don't like TVA?

No. TVA is the only wholesale power supplier in its region, and your local utility is the only company that can deliver power to your address. You can't switch to a different power company. However, you can contact your local utility about rate options, budget billing, or energy efficiency programs that might lower your bill.

Why did my power bill go up if TVA generates power from dams?

Hydroelectric power is cheap to run, but TVA's dams are aging and require expensive maintenance. TVA also invests in new infrastructure, environmental compliance, and renewable energy projects. These costs are passed through to utilities and then to you. Additionally, if rainfall was low that year, TVA generated less hydroelectric power and relied more on natural gas, which is more expensive.

Is TVA's power cleaner than other power companies?

TVA has one of the lowest carbon emissions per kilowatt-hour among large utilities in the United States, mainly because of its nuclear plants and hydroelectric dams. However, TVA still operates natural gas plants, which produce emissions. Your local utility may also buy power from other sources in addition to TVA, so your actual power mix depends on your utility's contracts.

How do I report a power outage?

Call your local utility company's outage line, which is usually on your power bill or on their website. Your utility will investigate whether the outage is on their local lines or on TVA's transmission system and will provide updates on restoration time. Most outages are resolved within a few hours, though major storms can cause longer outages.

Can I get a discount on my power bill if I use less electricity?

Your local utility may offer time-of-use rates, where you pay less during off-peak hours, or energy efficiency rebates for upgrading appliances or insulation. Contact your local utility to ask what programs are available in your area. These programs are offered by your local utility, not by TVA, though TVA sometimes funds them.