First Solar Inc. Solar Panels

First Solar Inc. Solar Panels

Ken James/Bloomberg

The sun shines off of First Solar Inc. solar panels at Intel Corp.'s campus in Folsom, California. First Solar Inc. is building NRG Energy Inc. 's 290-megawatt Agua Caliente solar project in Arizona. Warren Buffett’s MidAmerican Energy Holdings agreed to buy a 49 percent stake in the $1.8 billion project.