Earlier this month, WalletHub released a report on the Most & Least Energy-Expensive States that compares the average monthly energy bills in each of the 50 states and the District of Columbia. WalletHub’s formula takes into account electricity, natural gas, motor fuel, and home heating oil. The report shows a breakdown of states in each of these categories, then combines the data to create an aggregate model of the most to least expensive states based on the four factors.

Overall, Washington ranks as the third least energy expensive state on the list, with an average monthly energy bill of $253. Washington is beat only by Colorado ($252) and the District of Columbia ($203). It also has the second lowest electricity price, beat only by Louisiana.

While these findings may be great for Washingtonians’ wallets, they may not be as positive as they immediately appear. Matthew A. Turner, Professor of Economics at Brown University, explained that many states with lower energy costs do not mandate the use of renewable energy.

“Renewable energy is cleaner and contributes less to global warming, but there is no getting around the fact that is still costs more than coal and gas,” he said in a Q&A with WalletHub.

It makes sense, then, that another 2018 study done by WalletHub reveals Washington to be 17th in line for the greenest state in the country.

American families spend between 5 and 22 percent of their after-tax income on energy costs; 25 million of the United State’s poorest families are hit the hardest, paying more than a fifth of their total income in energy bills.

For a breakdown of each state’s results in this most recent study — and for data on greenest states and cities in America — visit wallethub.com.