SEGS 3-7 (Kramer Junction) is a 150-megawatt solar power plant. It is one of three separate sites within 40 miles of one another which make up a total of nine solar fields in the Solar Electric Generating System (SEGS). Together these three facilities can generate about 354 megawatts at peak output. Until around 2005, this comprised most of the commercial solar power produced worldwide, and for nearly 15 years, this was the second largest solar power plant in the world. It is a solar thermal plant, using parabolic troughs to generate heat, then steam, then power. It is supplemented with natural gas.
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