Colorado regulators on Wednesday unanimously approved a sweeping settlement agreement that will change how customers of Xcel Energy Inc. in the state get and pay for their electricity.

The agreement, between Xcel (NYSE: XEL) and 24 of 26 parties in three cases before the Colorado Public Utilities Commission, involves adding a massive amount (392 megawatts) of new solar power supplies in Colorado, and testing whether customers will cut their electricity use if prices vary by the time of day or the amount of power consumed.

“This will expand the development of all kinds of solar in Colorado, and will continue the trend of Colorado as a national leader in thoughtful development of renewable energy,” PUC Chairman Joshua Epel said following a series of verbal votes on elements of the agreement.

A written order detailing the decision is expected in a few weeks.

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