David Schraub, Covington & Burling LLP
The National Law Review

A Colorado federal district court Friday rejected a constitutional challenge to the state’s renewable energy portfolio law, concluding that it did not impose animpermissible burden on interstate commerce. Thirty states and the District of Columbia have enacted renewable portfolio standards, which typically require that a specified percentage of energy supplied by state utilities derive from renewable sources. The Colorado law, for example, mandates that 30% of the energy supplied by investor-owned utilities, 20% of that supplied by large energy cooperatives, and 10% of energy supplied by smaller cooperative and municipal utilities be renewable by 2020.

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