Switching the project to PV or the more common parabolic-trough CSP technology would be an “environmentally superior” choice, the regulator suggests.

Having cancelled and iced its Rio Mesa and Hidden Hills projects earlier this year, respectively, Palen represents the last large US project in BrightSource’s pipeline after the nearly completed 377MW Ivanpah is commissioned.

Palen was originally approved by California regulators in 2010 as a parabolic-trough CSP plant developed by a subsidiary of Germany’s Solar Millennium.

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