for buying and selling wholesale energy. In 2005, the WWF named ScottishPower's Cockenzie power station as the UK's least carbon-efficient power station. It is now closed. In 2007, the WWF named ScottishPower's Longannet power station as the UK's least carbon-efficient power station out of Europe's top 30 worst polluting power stations in absolute terms. It ceased operation in 2016. PPM Energy PPM Energy Inc was previously the competitive arm of Pacificorp but was made a separate business in 2002. It was involved in renewable energy and gas storage, amongst other things, in the US. It is now part of Avangrid Renewables. See also Energy policy of Scotland Energy use and conservation in the United Kingdom Green electricity in the United Kingdom References External links ScottishPower corporate website ScottishPower customer website SP Energy Networks Website 1990 establishments in Scotland Companies based in Glasgow Energy companies established in 1990 Companies formerly listed on the London Stock Exchange Electric power distribution network operators in the United Kingdom Former nationalised industries of the United Kingdom Oil and gas companies of Scotland Scottish brands Electric power companies of Scotland Utilities of Scotland Wind power companies of Scotland British subsidiaries of foreign companies British companies established in 1990 Iberdrola