Swedish energy company Vattenfall is set to begin construction for a new battery storage scheme this year at the 228MW Pen y Cymoedd onshore wind energy project in South Wales, UK.

Expected to be the largest co-located battery and windfarm project in the country, the 22MW system will offer a rapid-reaction grid reliability service known as Enhanced Frequency Response to the National Grid.

As defined by National Grid Electricity Transmission, Enhanced Frequency Response is planned to attain 100% active power output one second or less after registering a frequency deviation.

The six shipping container sized equipment will be deployed at Vattenfall’s Pen y Cymoedd project on a Natural Resources Wales managed estate.

As part of the project, the company intends to carry out preliminary site investigations for battery@pyc in June or July this year.

"Battery@pyc can respond to power fluctuations on the grid within a second by pumping in power if frequency drops, or drawing in if too high."

Vattenfall Battery@pyc's project manager Frank Elsworth said: “Battery@pyc can respond to power fluctuations on the grid within a second by pumping in power if frequency drops, or drawing in if too high.

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“These reliability services have been provided for decades, but not this smartly, so we think battery@pyc is the kind of affordable solution that will help power climate smarter living in the UK.

“We have started detailed planning for the construction of battery@pyc.”

Once preliminary site investigation is complete, construction is expected to begin as early as August and be completed by December this year. Operation is expected to commence in February next year.

Featuring 76 wind turbines, the Pen y Cymoedd onshore wind energy project is claimed to be the largest onshore wind farm in Wales and is capable of addressing electricity requirements of more than 13% of the UK households.

Image: Vattenfall’s Pen y Cymoedd wind power project. Photo: courtesy of Vattenfall.