A call to site specialist diesel generators at Pembroke Power Station to help keep the lights on in the event of a National Grid shutdown has been lodged with county planners.

In a screening application to Pembrokeshire County Council, RWE Generation UK PLC, through Ove Arup & Partners Ltd, wants to site up to six containerised diesel generators, diesel storage tank(s) and electrical connections at Pembroke Power Station, Pwllcrochan, near Pembroke.

The application site is within the site of the existing Pembroke Power Station, a combined-cycle gas turbine (CCGT) station which began commercial operation in September 2012, with a gross consented capacity of about 2,199 megawatts electric (MWe), replacing the previous oil-fired power station which operated for almost 30 years and was decommissioned in 1999.

A supporting statement says, subject to confirmation, it is considered to comprise permitted development, the scheme “a standalone plant, with its own fuel supply, capable of starting up, operating and shutting down independently from the power station”.

It adds: “It is required only in an emergency to maintain plant status and keep the power station operationally ‘ready’ in the event of a total or partial shutdown of the National Grid system. It is not required for the normal operation of the power station and does not extend its capacity, which remains as already consented, therefore it is not considered a change or extension.”

On need, it says it is mandatory that all electricity generators of over a megawatt have to adopt a new minimum standard of asset resilience; power stations “must be capable of restoring demand on the National Grid electricity transmission system in the event of a total or partial shutdown of the National Grid system”.

“The Power Station does not currently meet this new asset resilience standard, therefore new back-up power, control philosophy and on-site services that support site critical systems enabling the power station to remain ready to operate must be implemented.

“RWE is required to install a new enhanced emergency site auxiliary solution (diesel generators and diesel storage tanks) at the power station for resilience against the failure of the interconnected electricity distribution network into which it is normally connected in order to satisfy the Grid Code requirements by the mandated implementation deadline of December 31, 2026.

“RWE will make operational and fuelling provision, within its new resilience design at Pembroke power station of up to 120 hours, in order to provide capability to a slightly enhanced standard known to be valued by the National Energy System Operator (‘NESO’) in certain emergency network scenarios.”

It says construction is hoped to start in July 2026, lasting approximately nine to 12 months, the main part across the summer months.

The call will be considered by county planners at a later date.

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