years". He also indicates that his government has added 3,000 megawatts of power to the provincial grid. In October 2006, the Ontario Energy Board reduced the price of energy from 5.8 cents to 5.5 cents per kilowatt-hour, and from 6.7 cents to 6.4 above the 1,000 kilowatt-hour threshold. There was a further reduction to 5.3% and 6.2% in April 2007. As in October 2006, the Ontario Power Authority signed contracts with seven high-efficiency co-generation projects across Ontario, with combined capacity of 414 megawatts. All of the plants are expected to come online by May 2010. In November 2006, Duncan announced that the governments of Ontario and Quebec had agreed to join their power grids, to reduce Ontario's dependence on American power when demand exceeds capacity. The arrangement will see Ontario receive an additional 1,250 megawatts by 2010. Duncan is also attempting to finalize a deal with Manitoba, which has an abundance of hydroelectric power. Tom Parkinson, the chair of Ontario Hydro One, resigned in December 2006 after accusations of lavish overspending. The following month, Duncan established a four-member panel to recommend a new system of compensation for energy executives. He said that the review would help reduce bureaucratic waste. Critics have argued that the panel is too expensive, and unnecessary. In February 2007, Duncan said that Ontario is on target for meeting its Kyoto Protocol targets and that the province has achieved a 29% reduction in greenhouse-gas emissions from its coal plants since 2003. Opposition parties have argued that these reduced figures reflect a decline in the manufacturing sector, a charge that Duncan has rejected. In April, Duncan said that the province would not spend $1.6 billion to clean up the existing coal plants, arguing that the proposal was too expensive, would do nothing to benefit the environment, and was unnecessary given that the government still plans to phase out the coal plants by 2014. Also in April 2007, Duncan announced that Ontario would ban the sale of inefficient incandescent light bulbs by 2012. The decision makes Ontario the first jurisdiction in Canada, and one of the first in the world, to take this step. In the same month, Duncan announced that a California company would construct the largest solar farm in Ontario, near Sarnia. Retirement from provincial politics Despite media speculation pegging him as the frontrunner in the 2013 Liberal leadership election, Duncan decided not to run to succeed