Sunpower’s Stock Slump Shows How Policy Can Make or Break Solar

Government policy has a huge effect on the growth of solar power and few companies demonstrate that relationship better than SunPower. The company has been hurt by major policy changes in the U.S. and China and expects lower deployments this year.

The San Jose, Calif.-based company’s shares tumbled 6.5% in early trading on Wednesday after SunPower announced strong third-quarter earnings but reduced guidance for how much solar power it would deploy this year.

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