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  • bluecheese4u bluecheese4u Aug 3, 2013 10:18 AM Flag

    Permanent load shifting and the future of energy storage

    Permanent load shifting and the future of energy storage

    Kathleen Wolf Davis | Jul 23, 2013
    By Mark M. MacCracken

    Energy storage is critical to creating a more reliable, efficient electrical grid by optimizing other grid assets and utilizing them more intelligently. Simply put, energy storage disconnects when energy is created (or collected) from when it is used. In the case of building-scale energy storage, it shifts a large portion of a building’s energy demand from on-peak to off-peak times. Grid scale storage captures large amounts of excess energy that may be available from renewable energy and stores it for use when called upon by the electric grid.

    To increase the widespread use of both building and grid scale energy storage giant steps have taken place across the United States. In Congress, Senator Wyden has introduced S.1030: Storage Technology for Renewable and Green Energy Act of 2013. Most recently, the California Public Utilities Commission (CPUC) has released a proposal to consider the adoption of procurement targets for viable and cost effective energy storage systems. One of the targets would be the implementation of 1.3 gigawatts of storage by 2020. This proposal is a result of the 2010 California Assembly Bill 2514, the first state law in the nation for energy storage.

    In addition to the Green Energy Act and CPUC proposal, California has also introduced Resolution E-4586. This will implement a standardized permanent load shifting (PLS) program applicable to SCE, PG&E and SDG&E, three of California’s public utilities. As defined by the California Resolution, “Permanent Load Shifting” refers to the shifting of energy usage from one period of time to another on a recurring basis, often by storing energy produced during off-peak hours and using the energy during peak hours to support loads. Examples of PLS technologies include ice storage and batteries. Ice storage systems use a standard chiller to produce ice overnight which is stored in

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