Generator Drax has announced that it will not bid its Cruachan II pumped hydro energy storage (PHES) project into the long duration energy storage (LDES) support mechanism.
The UK government recently launched the first window of its long-duration energy storage (LDES) cap and floor scheme to underwrite revenues and reduce investor risk for projects deliverable between 2030 and 2033, with applications due by 9 June, 2025.
Drax said it would not participate in this first phase of the cap and floor scheme with the 600MW Cruachan II project, an extension of the existing 440MW Cruachan pumped storage plant, saying that costs have risen while ‘recoverability of capital’ is unclear. The firm completed initial design and engineering work on an option to extend it last year.
‘The projected cost of Cruachan II has risen over the past two years, whilst at the same time, the recoverability of all capital invested in the project remains unclear. Therefore, Drax will not participate in this first phase of the cap and floor scheme but will retain the option for potential future development, subject to an appropriate balance of risk and return,’ it said in a trading update.
The company believes the project is aligned with the long-term system need in the UK for flexible generation and energy storage and its location in Scotland is ideal given the cross-border constraints, with lots of wind generation in and around Scotland but big demand centres being south of the border. The firm first applied to expand Cruachan in 2022.
The decision to pull Cruachan from the scheme is interesting considering that a collection of the UK’s short-duration battery energy storage system (BESS) owner-operators have recently signalled their opposition to the LDES cap and floor in an open letter, saying it is biased towards pumped storage. Cruachan II has been one of the most high-profile pumped storage projects expected to bid in.
This article was originally published on Energy Storage News, where readers can also find an interview with one of the letter’s signatories, James Basden of Zenobe (Premium access).
