Capital Dynamics has acquired a ready-to-build 170MW battery energy storage project in Knockanure, County Kerry, marking the private asset manager’s first investment in the Republic of Ireland.
The project is designed for four hours of storage and has secured 170MW of grid connection capacity at the neighbouring 110kV Knockanure substation. Procurement and delivery planning have already started following planning consent secured in October 2025.
Four-Hour Design Creates About 680MWh of Storage
A four-hour system operating at its full 170MW rated power implies approximately 680MWh of usable energy capacity. That makes Knockanure a materially different grid asset from short-duration batteries designed mainly for rapid frequency response.
Capital Dynamics says the project is expected to be among the first in the Republic of Ireland delivered as a long-duration energy storage solution under EirGrid’s classification.
Long-Duration Storage Targets Renewable Curtailment
Ireland already produces a significant share of its electricity from renewable sources, particularly wind. High renewable output can sometimes exceed demand or the transmission system’s ability to move electricity to where it is needed.
When that happens, renewable generation may be curtailed. A four-hour battery can absorb part of that surplus and return it to the grid later, reducing wasted generation and increasing flexibility.
Longer-duration batteries can also support evening peaks or other multi-hour periods when electricity demand remains high after renewable output changes.
Acquisition Moves Capital Dynamics Into the Republic
The transaction expands Capital Dynamics’ activity in the wider Irish Single Electricity Market and establishes its first investment in the Republic of Ireland.
The firm has been increasing exposure to long-duration storage as electricity systems require more flexible assets. Buying a permitted, grid-connected, ready-to-build project gives it a shorter route to construction than acquiring an earlier-stage development.
Four-Hour Storage Strengthens Ireland’s Grid Flexibility
European battery storage is moving toward larger systems with longer discharge durations. Projects measured in hundreds of megawatts and several hours are designed to provide meaningful energy shifting, not just seconds or minutes of grid support.
Knockanure therefore represents a shift in storage’s role from ancillary-service technology toward core electricity-system infrastructure. Its 170MW connection and four-hour design could help Ireland integrate additional renewable generation while improving resilience during periods of changing supply.
The acquisition also signals institutional appetite for storage projects that have already cleared major development hurdles such as planning and grid access.
Development Milestones Will Determine Delivery Timing
Capital Dynamics has already begun procurement and delivery planning. The next milestones will include supplier selection, construction mobilisation, financing arrangements and confirmation of a target commercial-operation date.
Because the project is ready to build, progress can now shift from development risk toward execution risk: equipment delivery, construction performance and grid commissioning. Once operating, Knockanure will provide a significant new four-hour storage resource for the Irish electricity system.
