I want to know the answer to the following question:
What governmental department contributed a grant to Schwarzenegger's hydrogen fuel project?
All the background I'm provided with is that "After the election, he signed an executive order to jump-start the building of hydrogen refueling plants called the California Hydrogen Highway Network, and gained a U.S. Department of Energy grant to help pay for its projected US$91,000,000 cost.". Is that enough to answer the question?