Environmental groups have criticised the construction of a new gas-fired power station, which will be officially opened today in Pembrokeshire.
The owners of Pembroke Power Station say it'll generate enough electricity for half the homes in Wales. The gas powered plant, which employes 100, is estimated to be worth £10 million a year to the local economy.
The site will be opened by new Parliamentary Under Secretary of State for Wales Stephen Crabb MP, in his first official appointment since being appointed to the Wales Office ministerial team.
Friends of the Earth says the development uses "outdated technology" and claim that it will pollute Milford Haven.
Friends of the Earth has raised concerns over the efficiency of the site, and its impact on the nearby estuary. It's calling on the First Minister Carwyn Jones to boycott the opening.
Operator RWE npower says the site will have a total generating capacity of around 2,000MW, and will produce enough energy for around three and a half million homes.
In November 2000, the 731ft high chimney of the derelict Pembroke Power Station was demolished.