- Copenhagen Infrastructure Partners has taken final investment decision on the 350 MW / 1,400 MWh Kilmarnock South battery in South Ayrshire.
- More than €270m has been committed, with construction under way and operation targeted for the first quarter of 2028.
- A long-term optimisation agreement with Shell provides contracted revenue, helping support a project designed to absorb surplus Scottish wind generation.
Copenhagen Infrastructure Partners (CIP) has committed more than €270m to a four-hour battery in southern Scotland, taking one of Britain’s largest storage projects into construction as grid congestion and wind curtailment costs reach record levels.
Kilmarnock South will provide 350 MW of power and 1,400 MWh of energy storage, allowing it to discharge at full output for four hours. Commercial operation is scheduled for the first quarter of 2028.
CIP is making the investment through its Copenhagen Infrastructure IV fund. UK developer Noriker Power originated the project and will continue to provide engineering and construction-management services.
The project has a long-term optimisation agreement with Shell Energy Europe, which CIP says will provide contracted revenue. Neither company has disclosed the contract length, revenue guarantee, upside-sharing arrangement or battery supplier.
“Well-sited battery energy storage projects provide valuable power-system flexibility,” CIP partner Nischal Agarwal said in the investment announcement.
CIP doubles down on Scottish storage
Kilmarnock South is CIP’s fourth transmission-connected battery investment in Scotland, following the 500 MW / 1,000 MWh Coalburn 1 project, which began commercial operation in August, and the Coalburn 2 and Devilla developments.
Once all four are commissioned, CIP’s Scottish portfolio will provide 1.85 GW of power and 4.4 GWh of storage. Kilmarnock South is the longest-duration asset in that fleet: the three earlier projects were designed for two hours.
Noriker says the project will connect directly to the 400kV transmission system and has been divided into four independently operable battery units. More than a year of engineering work was completed before construction, including early procurement of supergrid transformers – equipment that has become a significant international supply chain bottleneck.
Scottish ministers consented the 350 MW development in January 2024, according to the Energy Consents Unit record.
The headline investment is equivalent to roughly €193 per kilowatt-hour of storage capacity, although that simple calculation includes the wider project scope – grid connection, transformers, civil works and development costs – rather than battery equipment alone.
There is potential for confusion, because Zenobē operates a separate 300 MW / 600 MWh project also described as Kilmarnock South. CIP’s development is the 350 MW Noriker-originated project at Camsiscan Farm near Craigie.
Storage helps – but cannot replace wires
CIP says the battery will charge using surplus Scottish wind generation that would otherwise be curtailed and discharge when the network has available capacity. The commercial rationale has strengthened as Britain’s wind-related constraint costs have exceeded £1.5bn this year.
The four-hour configuration allows the project to absorb a larger block of surplus electricity and wait longer for an attractive discharge window than a two-hour system. Shell can optimise that flexibility across wholesale, intraday and balancing markets rather than relying mainly on frequency-response contracts.
However, a battery does not create transmission capacity. To reduce constraints, it must charge when wind output is trapped on the Scottish side of a bottleneck and discharge later, rather than competing with generation during another constrained period. Its performance will depend on market signals and NESO’s ability to dispatch storage efficiently.
The Shell contract is therefore central to both financing and system value. It reduces CIP’s merchant exposure while placing operational decisions with an experienced power trader. The undisclosed terms will determine how much price risk Shell assumes and how much upside remains with the investor.
Kilmarnock South is important because it combines three trends now reshaping the UK’s storage market: materially longer lithium-ion duration, direct transmission connections and contracted optimisation agreements. It is also evidence that investors see Scotland’s grid congestion not only as a cost to consumers, but as a durable commercial opportunity – at least until transmission construction catches up with renewable generation.
