Sunpower just announced that it has added an additional 40 MW of capacity to its contract for the development of the California Valley Solar Ranch for PG&E. That means that the completed plant will be 250MW, one of the largest solar PV plants in the world.

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In a press release, Howard Wenger, president of SunPower’s utilities and power plants business group, commented on the news:

“We are thrilled to continue to advance one of the first central station solar power plants in the world with PG&E and in coordination with San Luis Obispo County. The California Valley Solar Ranch will generate pollution-free solar power that is competitive with new, conventional peak power.  Our incremental 40-MW agreement with PG&E provides more visibility into our power plant pipeline in 2011 and beyond.”