June 2007, that it was beginning a two-year moratorium on proposals for new coal-fired power plants while it undertook more aggressive efficiency and conservation programs. The company added, "Additional reductions in future electricity demand growth through energy efficiency could push the need for new power plants farther into the future." Public Service of Colorado concluded in its November 2007 Resource Plan: "In sum, in light of the now likely regulation of CO2 emissions in the future due to broader interest in climate change issues, the increased costs of constructing new coal facilities, and the increased risk of timely permitting to meet planned in-service dates, Public Service does not believe it would not be prudent to consider at this time any proposals for new coal plants that do not include CO2 capture and sequestration. Xcel Energy noted in its 2007 Resource Plan that "given the likelihood of future carbon regulation, we have only modeled a future coal-based resource option that includes carbon capture and storage." Minnesota Power Company announced in December 2007 that it would not consider a new coal resource without a carbon solution. Avista Utilities announced that it does not anticipate pursuing coal-fired power plants in the foreseeable future. NorthWestern Energy announced on 17 December 2007, that it planned to double its wind power capacity over the next seven years and steer away from new baseload coal plants. The plans are detailed in the company's 2007 Montana Electric Supply Resource Plan. California Energy Commission (CEC) has initiated its review of two 53.4-megawatt solar thermal power plants that will each include a 40-megawatt biomass power plant to supplement the solar power. Asia China As of 2020, over half of the world's coal-generated electricity was produced in China. In 2020 alone, China added 38 gigawatts of coal-fired power generation, over three times what the rest of the world built that year. China is confident of achieving a rich zero carbon economy by 2050. In 2021, the government ordered all coal mines to operate at full capacity at all times, including holidays; approved new mines, and eliminated restrictions on coal imports. In November 2021, China reached record coal production levels, breaking the previous historic record, established in October 2021. China's exceedingly high energy demand has pushed the demand for relatively cheap coal-fired power. Serious air quality deterioration has resulted from the massive use of coal and many Chinese cities suffer severe smog