California ISO makes policy changes to benefit solar, wind, energy storage

The California Independent System Operator board of governors accepted proposed tariff revisions that will ensure solar, wind and battery storage resources can provide needed grid services.

In doing so, renewable resources will adjust their system controls so that power voltages and currents remain in sync with grid operations.

“California has a history of leading the nation in the integration of renewable resources. We are pleased to now take this next step in which clean power resources can contribute to the reliability of the grid,” said Steve Berberich, California ISO President and CEO. “By providing reactive power, these resources are better suited to help us integrate increasing numbers of renewable resources.”

The proposed tariff revisions, which are required by the Federal Energy Regulatory Commission (FERC), establish uniform rules for ensuring that new renewable resources, or resources that planned to be upgraded, take the steps to align alternating currents and voltages with grid requirements.

This measure will help avoid energy inefficiencies and losses that occur when the grid and resources are not properly in sync. The California ISO will also submit these rules to the FERC for its review.

During its August meeting, the board also authorized California ISO management to pursue “reliability must-run” contracts with specific generation plants in 2017 to ensure the availability of adequate power supplies.

In addition, the board accepted changes to market settlement rules to allow participants more time to review and dispute settlement invoices.

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The Clarion Energy Content Team is made up of editors from various publications, including POWERGRID International, Power Engineering, Renewable Energy World, Hydro Review, Smart Energy International, and Power Engineering International. Contact the content lead for this publication at

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