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Ireland’s First Combined Ultracapacitor & Energy Storage Facility

Originally published on the ECOreport.

Ireland intends to achieve 40% renewable energy by 2020. This is an ambitious goal, considering most of this electricity comes from large-scale wind farms. “The challenge is that it is an island grid, with only limited connection to the UK,” said Klaus Harder, Business Development Manager at FREQCON GmbH. Some winter nights, the Irish grid will have to take 75% of its electricity from renewable sources. This calls for additional services, so FREQCON deployed Ireland’s first ­combined ultracapacitor & energy storage facility for the Tallaght Smart Grid Testbed in South Dublin County.


“This 300 KW/ 150 kWh system was developed to demonstrate that a combination of lithium-ion batteries, Maxwell Technologies ultracapacitors, and FREQCON power converters can deliver what is needed. For us, this is a good foot in the door to the Irish market and we’re getting a lot of interest from people who want to look into this space,” said Harder.


Though this is a trial run in Ireland, one of FREQCON’s recent contracts was a 5 MW/ 10 MWh facility in China.

Around 90% of its business is in Asia. Most of this is in China and South Korea. One of its clients is China’s leading wind turbine developer, Goldwind.

FREQCON was one of Maxwell’s first customers, 15 years ago. It first used the San Diego company’s ultracapacitors for pitch control in wind turbines.

“We have been promoting the grid energy storage applications in the past years,” said Wolfgang Beez, Sr. Product Marketing Manager at Maxwell.


Ultracapacitors respond much faster than battery storage, discharging in fractions of a second and with more immediate power. This makes them invaluable in grid applications like Ireland, where large amounts of wind energy is being fed into the grid. However, batteries produce and store energy through a chemical reaction, rather than storing it in an electric field, which means they have more capacity.

“You combine two complementary technologies to provide a service that neither would be able to do as efficiently and by combining them you come up with a very cost efficient fast frequency response system and also provide back up power with the batteries,” said Beez.

Harder said the project fits with Tallaght’s goal to become a smart city. One of the key elements of this concept is the deployment of embedded renewable power generation in combination with energy storage and demand side management.

“Ireland’s goal is to reach 40% and even higher renewable penetration after 2020,” said Harder.


Image Credits: Neighbouring Irish Countryside; Klaus Harder,Wolfgang Beez, FREQCON’s DS3 300 kW Microgrid Stabiliser

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Written By

is the President of Cortes Community Radio , CKTZ 89.5 FM, where he has hosted a half hour program since 2014, and editor of the Cortes Currents (formerly the ECOreport), a website dedicated to exploring how our lifestyle choices and technologies affect the West Coast of British Columbia. He writes for both writes for both Clean Technica and PlanetSave on Important Media. He is a research junkie who has written over 2,000 articles since he was first published in 1982. Roy lives on Cortes Island, BC, Canada.


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