DOE gives $17.1 million energy storage grant


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Grid Energy Storage integrates intermittent wind and solar into the smart grid using lithium-ion batteries, pumped hydro, and compressed air, enabling frequency regulation, DOE-backed projects, and lower carbon emissions while improving reliability and flexibility.

 

Essential Takeaways

Technologies and systems that store electricity to balance supply and demand on the smart grid and integrate renewables.

  • DOE funds AES 20 MW lithium-ion grid battery in New York
  • Cuts frequency regulation emissions by up to 70 percent
  • California mandates utility energy storage targets
  • PG&E pilots CAES and pumped hydro for peak shifting
  • Tesla and SolarCity test home solar battery storage

 

Energy storage isn’t as sexy as solar projects that offer opportunities to cut ribbons on shiny futuristic technology. Nor does it attract the billions in federal loan guarantees and incentives awarded to wind farms and photovoltaic power plants.

 

But utilities and the government are increasingly recognizing that energy storage systems are crucial to integrating intermittent renewable energy projects into the smart grid.

Hence the United States Department of Energy’s finalization of a $17.1 million grant to utility AES to build a 20 megawatt lithium ion battery storage system using A123 Systems’ technology.

The battery packs will be installed at an AES facility in Johnson City, N.Y., and used to smooth out fluctuations in the power grid. Rather than burn fossil fuels to balance supply and demand, renewable energy from wind, solar or other renewable sources can be stored in the battery systems and released when needed.

That could reduce carbon emissions from so-called frequency regulation by 70 percent, according to the Energy Department.

“The AES project helps reduce carbon emissions and strengthens our energy infrastructure by allowing for more renewable energy sources like solar and wind to contribute to the electrical grid,” Energy Secretary Steven Chu said in a statement. “Bringing more efficiency and reliability to the grid will help cut costs for consumers and power a cleaner energy future.”

California enacted a law this year mandating that regulators determine the amount of energy storage the state’s three big investor-owned utilities should be required to maintain.

Utility PG&E, for example, is planning a pilot project to tap electricity generated during peak wind farm production to pump compressed air into an underground reservoir. When demand spikes, the reservoir would release the air to run electricity-generating turbines, which are capable of producing 300 megawatts of power.

The utility has also proposed building a “pumped hydro” storage system, which would transfer water from one reservoir to another reservoir at a higher elevation during times of peak renewable energy production. Water in the upper reservoir would then be sent back downhill to power a turbine when electricity demand begins to rise.

In September, the California Energy Commission funded a pilot project proposed by Tesla Motors and SolarCity, a Silicon Valley photovoltaic panel installer, to store electricity generated by residential rooftop solar systems in lithium ion car batteries for use during peak demand. The Sacramento Utility District is undertaking a similar project.

 

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