The size of solar-power installations is shifting away from the multimegawatt solar farms of 10 to 20 years ago toward smaller installations of 1 MW or less. Factors driving this trend include utilities' increasing use of residential and industrial rooftops as localized solar-power-generating stations, thus reducing the need for conventional power plants, and the emergence of solar-PPA (power-purchase-agreement) companies, which install rooftop solar panels on homes and small businesses in exchange for access to the generated power (Reference 1).
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