Power (in the regulated energy industries of the states of Oregon, Washington, California), and as Rocky Mountain Power (in the regulated energy industries of the states of Idaho and Utah as well as both and central and eastern Wyoming (former Pacific Power territory), and southwestern Wyoming). In May 2005, ScottishPower announced that it had agreed to sell Pacificorp to MidAmerican Energy Holdings Company, a company controlled by Warren Buffett's company, Berkshire Hathaway, for US$5.1 billion in cash and US$4.3 billion in debt and preferred stock. The successful completion of the deal was announced on 21 March 2006, after securing regulatory approvals. The deal did not include PPM Energy (which, as Pacificorp Power Marketing, was formerly the non-regulated subsidiary of Pacificorp). Rejected takeover bid from E.ON Following the announcement, the group's share price rose but was now widely seen as vulnerable to a takeover. It was soon revealed that the German energy group E.ON, who also owns Powergen, was interested in a takeover. On 22 November 2005, the board rejected an offer from E.ON of 570 pence a share, which would have valued the group at £10.7 billion. Takeover bid from Iberdrola On 28 November 2006, the board of directors of ScottishPower agreed to an £11.6 billion takeover bid by the Spanish energy firm Iberdrola. The offer was formally approved by shareholders at an EGM on 30 March 2007, effectively creating Europe's third largest utility company. Extra Energy SoLR Appointment On 24 November 2018, the British government's energy regulator, the Office of Gas and Electricity Markets (Ofgem) appointed Scottish Power as Supplier of Last Resort for the failed domestic and business supplier Extra Energy. Scottish Power acquired all of Extra Energy's 108,000 domestic customers and 21,000 business customers. Tonik Energy SoLR Appointment On Friday 9 October 2020, Ofgem appointed Scottish Power as Supplier of Last Resort for the failed domestic supplier Tonik Energy. Scottish Power acquired all of Tonik Energy's 130,000 customers. Yorkshire Energy SoLR Appointment On Friday 5 December 2020, Ofgem appointed Scottish Power as Supplier of Last Resort for the failed domestic supplier Yorkshire Energy (also known as Daisy Energy). Scottish Power acquired all 74,000 domestic customers and a small number of non-domestic customers. Regulatory investigations, harassment, poor customer service and complaints In April 2007, the energy regulator Ofgem urged customers of Scottish Power and EDF Energy to switch to a cheaper provider after the firms refused to cut