OLYMPIA, Wash. (AP) — The Washington House passed a measure Thursday that seeks to eliminate fossil fuels like natural gas and coal from the state’s electricity supply by 2045.

The measure — a key piece of Gov. Jay Inslee’s climate agenda — passed on a 56-42 vote. It passed the Senate last month, on the same day that Inslee announced he was running for president. Because the bill was amended by the House, it heads back to the Senate for a final vote.

Inslee has been campaigning on the promise that if elected he will make addressing climate change the country’s top priority.

The clean energy bill is the centerpiece of a proposal he announced in December. Washington relies heavily on hydroelectric power and already generates more than 75 percent of its electricity from carbon-free sources. The measure would require utilities to eliminate coal as an energy source by the end of 2025.