Google announced a major investment in four solar photovoltaic (PV) projects Tuesday, bringing the company’s portfolio of clean energy projects to almost $1 billion.

The latest investment of $94 million is the first money the search giant has put toward generating energy into the U.S. grid. Past projects brought solar panels to 10,000 homeowners through the rooftop installations.

“We believe investing in the renewable energy sector makes business sense and hope clean energy projects continue to attract new sources of capital to help the world move towards a more sustainable energy future,” Axel Martinez, assistant treasure of Google Treasury, wrote in a blog post.

The best states in the U.S. for solar power energy are Nevada, Arizona, California, Texas and New Mexico.