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Intermittent Renewables and Pumped Storage Facilities

Published by James Wiggins at October 4, 2017
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As more intermittent renewable energy sources, such as wind and solar, are added to the electric grid, pumped storage facilities are vital to stabilization of the electric grid.  Traditionally, pumped storage facilities have been used to take advantage of the varying cost of electricity.  During periods when the cost of power was low, such as nighttime hours, pumped storage facilities would draw water from a lower elevation reservoir and pump it to a higher elevation reservoir with that low cost electricity.  As the price of electricity increased during the day, the pumped storage facilities would drain that water stored in the upper reservoir to the lower reservoir, through a hydraulic turbine generator, selling the generated power at a higher price point.  However, with the heavy addition of intermittent renewable energy sources to the grid, the function and purpose of existing pumped storage facilities must change to help add stability to the grid.  This will also enhance the potential of additional renewable energies.

Instead of  pumping water to the upper reservoir during nighttime hours when the price point of power is low, pumped storage facilities should be operating when wind and solar facilities are at their peak loads.  During these times, solar power plants and wind farms are generating excess power that must be stored. Storing this excess energy at pumped storage facilities provides a clean and environmentally-friendly way to keep the lights on when the wind and solar energy sources are unavailable.  A fear that many consumers have with intermittent renewables is that power will not be available to them when it is needed.  Utilizing pumped storage facilities to provide power to consumers when solar and wind is unavailable can help to alleviate this concern.

An informative article by the Los Angeles Times describes how California is producing a lot of excess energy during periods of high solar irradiance (intensity) and high wind speed because of its investment in renewable energy sources. Back in March, California was producing so much energy through renewable sources that they needed to give the excess power away.  In some cases, they actually had to pay other states to take it.  This has raised the cost of renewable energy and has forced it to become underutilized.  Furthermore, this same excess energy was not available for use at night, raising the price point of power during nighttime hours in California.  California should invest in additional pumped storage facilities to store this excess energy produced during daylight hours for use at night.  Giving it away for free or paying other states to take it is not a sound economic model.  As other states in the US begin investing in installation of intermittent renewables, they should consider repurposing existing pumped storage facilities to support nighttime operations for electric grid stability.  The addition of more pumped stored facilities will be necessary as more energy is generated through renewable energy sources.

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James Wiggins
James Wiggins
James Wiggins is a Senior Specialist with FCS. He provides engineering and technical services in support of operations and maintenance programs for power and process plants. As a former Mechanical Operator and Staff Instructor for the U.S. Navy, he was responsible for the initial qualification of students at the Nuclear Power Prototype. James is experienced in multiple training methods including one-on-one instruction, classroom instruction, and simulator operations.

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1 Comment

  1. Solar Power says:
    May 30, 2018 at 6:28 am

    Thank you very much for the insiteful writing. I have shared
    it on my google plus page.

    Reply

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