Brookings found the states known to have clean energy funds have invested $2.7 billion in renewable energy in the past decade. And they’re seeing that investment come back four-fold.

A co-author of the report, Lew Milford, says New York is doing particularly well.

‘I think the bottom line here is that a state like New York really is showing the way. That it’s important to do everything, as much as possible, from supporting projects to supporting industries to doing work force training,’ says Milford.

Milford says New York has done a good job cultivating its own industry instead of trying to poach companies from other states. Specifically, the state has seen a number of companies invest in battery and energy storage technology.