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Advancing Clean Energy: Energy Storage

A solar energy storage system being tested.

A solar energy storage system being tested. The storage systems store surplus renewable energy when it’s produced for use later.

Dennis Schroeder / NREL

Case Overview

In October 2013, the California Public Utilities Commission (PUC) finalized a groundbreaking decision to build innovative high-tech energy storage systems that will lead California toward a future of clean, renewable energy and away from dependence on fossil fuels.

The decision will require power companies to expand their capacity to store energy, improving storage and delivery of renewable energy resources, reducing the need for gas-fired power plants, cutting climate change pollution, and making California’s electrical grid more reliable. In the decision, the state’s investor-owned utilities must begin buying a combined 200 megawatts of energy storage technology by 2014 and reaching 1.3 gigawatts (1,325 megawatts) by the end of 2020.

Energy storage systems can use mechanical, chemical, or thermal processes to store energy; these processes range from battery technologies to energy storage within compressed air or molten salt. The PUC proposed ruling anticipates energy storage market transformation reducing the cost and increasing the availability of energy storage systems.

The PUC decision is the culmination of California Assembly Bill 2514 (AB 2514) passed in 2010, the first state law that solely focuses on incorporating energy storage into the electrical grid.

Case ID



Case Updates

April 15, 2014 | Feature

The United States of Solar

Earthjustice's clean energy work stretches from the islands of Hawaiʻi to across the mainland. Learn about our key litigation and policy work on solar energy nationwide and in states across the country.

February 22, 2013 | Blog Post

Storage Needed When There Is No Sun, Wind

Most people know that solar and wind energy is only generated when the sun shines or the wind blows. This leaves potential power gaps at times of no sun or wind. One of the Holy Grails of renewable energy has been storage systems (think battery here) that can store surplus energy when it’s produced for use later.

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