The Agua Caliente solar project in Yuma County, Arizona — which is one of the world’s largest solar panel farms — is now two thirds completed, according to the owners and developer of the project, NRG Energy, MidAmerican Solar and First Solar. The solar farm, which is supposed to be completed in 2014, employs 400 to 450 workers per day, and California utility PG&E has a contract to buy the power.

Agua Caliente is now generating 200 MW of solar power, and will provide 290 MW when completed. The project is being funded by a $967 million loan guarantee from the Department of Energy, as well as equity from owners NRG Energy and MidAmerican Solar, which is the energy-focused fund owned by Warren Buffett’s Berkshire Hathaway. MidAmerican bought 49 percent of the $1.8 billion farm in January of this year.