There were 3 × 25 MW auxiliary gas turbine electricity generators on the Pembroke site, these were first commissioned in November 1969.

[3][4] The generating capacity, electricity output, load factor and thermal efficiency were as shown in the table.

The company changed its mind in the face of fierce opposition and the plant closed in 1997[6] with the loss of 300 jobs.

[7] A former member of staff, and his spouse through washing asbestos laden overalls, later died in 2012 and 2022 from mesothelioma as a result of negligence at the plant between 1969 and 1982.

[9] A public exhibition was held in Pembroke Town Hall in February 2005, outlining the proposal to build the £800 million power station in support of the company's planning application.

Alstom took on most (if not all) of the local subcontractors and paid all wages due and has since won its case against Somi in a high court judgement.

The EU commission has requested that the British government prove the new power station's cooling system does not adversely affect marine wildlife in the Milford Haven waterway.