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.