Greenest States: Renewable Energy Mix and Carbon Footprint

Vermont generates roughly 99% of its in-state electricity from renewable sources. Mississippi generates less than 5%. That gap, wider than most people realize, shapes everything from your utility bill to your state's long-term economic exposure to federal carbon policy.

How We Measured "Greenest"

We used three metrics: share of electricity from renewables (wind, solar, hydro, geothermal), carbon dioxide emissions per capita from the energy sector, and electricity cost per kilowatt-hour. A state can look "green" on paper while still exporting pollution or importing dirty power. We focused on in-state generation and resident emissions, not grid accounting tricks.

Data draws from EIA state-level generation reports and EPA emissions inventories, with the most recent figures from late 2025 state filings, which represent 2026's baseline policy environment.

The Top Five States by Renewable Share

Vermont leads at approximately 99% renewable electricity, powered mainly by hydro imports from Quebec and significant in-state wind and solar. Average retail electricity cost runs about 21 cents per kilowatt-hour, which is high, but the state's per-capita carbon emissions from electricity sit near the lowest in the nation.

Idaho generates around 88% of its electricity from hydropower alone. Rates are among the cheapest in the country at roughly 10 cents per kilowatt-hour. Idaho rarely gets credit in green energy conversations, but its grid is exceptionally clean.

Washington State follows at approximately 83% renewables, again driven by Columbia River hydro. Rates average 11 cents per kilowatt-hour. Washington's challenge is that its building and transportation sectors still run heavily on fossil fuels, which drags down its overall per-capita emissions picture.

South Dakota generates close to 80% of its electricity from wind and hydro. It is one of the least-discussed clean energy success stories in the country, partly because it has no major urban media market pushing the narrative.

Oregon sits near 75% renewable electricity, with hydro, wind, and a growing solar buildout. Average rates land around 13 cents per kilowatt-hour.

The States With the Dirtiest Grids

West Virginia runs on coal for roughly 90% of its electricity generation, the highest coal dependency of any state. Its per-capita carbon emissions from electricity are the highest in the nation by a significant margin. Rates average about 12 cents per kilowatt-hour, low in absolute terms, but those rates reflect a fuel source with declining federal political protection and rising long-term risk.

Kentucky and Wyoming follow closely, each generating more than 70% of their electricity from coal. Missouri, Indiana, and North Dakota all exceed 50% coal generation.

Texas presents a more complicated picture. It leads the entire country in absolute wind and solar capacity, but it also runs massive natural gas plants to cover demand. Its grid sits around 40% renewable overall, with natural gas filling most of the rest. Texas per-capita emissions from electricity are moderate, not great, not disqualifying.

California has made aggressive solar investments and banned new gas car sales, but its grid still relies on natural gas for roughly 35% of generation. It imports power from neighboring states, some of it coal-sourced, which keeps its true emissions higher than state marketing suggests. Californians also pay 28 to 32 cents per kilowatt-hour, the second-highest retail rate in the contiguous U.S.

Cost of Going Green Isn't What You Expect

The cleanest-grid states are not the most expensive. Idaho and South Dakota offer cheap, clean power. The most expensive electricity states, California, Massachusetts, Connecticut, and Hawaii, are not necessarily the greenest in terms of total per-capita carbon output once you account for transportation and heating.

If your goal is to minimize your household carbon footprint at the lowest cost, Idaho, Oregon, and Washington offer the best combination of clean grids and reasonable rates. Vermont is clean but expensive. California is expensive and only moderately clean.

These tradeoffs connect directly to broader cost-of-living decisions. States with high energy costs compound other expenses in ways that matter over time. The True Cost of Living in High-Tax States breaks down how utility costs stack onto tax burdens, and it's worth running your full picture through our state comparison calculator before drawing conclusions.

For retirees in particular, energy costs and environmental policy stability belong in the same conversation as income tax treatment. Our Best States for Retirees to Avoid Taxes post includes several states that also happen to rank well on clean energy costs.

Key Takeaways

• Idaho generates 88% of its electricity from hydropower at roughly 10 cents per kilowatt-hour, the best clean-and-cheap combination in the country.
• West Virginia's grid is approximately 90% coal, producing the highest per-capita electricity emissions of any state.
• California pays 28 to 32 cents per kilowatt-hour for a grid that still draws 35% from natural gas, making it neither the cheapest nor the cleanest option despite its reputation.

Compare your current state against every other on clean energy mix, electricity costs, and total cost of living at liveordiehere.com.