U.S. Energy Secretary Steven Chu announced in a letter Friday he will step down from his position at the end of this month.
In his time as U.S. Energy Secretary, Chu pushed for growth in renewable energy and clean tech innovation.
Chu led the department during President Barack Obama’s stimulus package. The department divvied up about $3.5 billion in the Pacific Northwest.
Much of the money went to projects that helped develop energy efficiency and smart grid technologies.