is also used on many college campuses, often in combination with district cooling and electricity generation. Colleges using district heating include the University of Texas at Austin; Rice University; Brigham Young University; Georgetown University; Cornell University, which also employs deep water source cooling using the waters of nearby Cayuga Lake; Purdue University; University of Massachusetts Amherst; University of Maine at Farmington; University of Notre Dame; Michigan State University; Eastern Michigan University; Case Western Reserve University; Iowa State University; University of Delaware; University of Maryland, College Park , University of Wisconsin–Madison, University of Georgia, University of Cincinnati, North Carolina State University, and several campuses of the University of California. MIT installed a cogeneration system in 1995 that provides electricity, heating and cooling to 80% of its campus buildings. The University of New Hampshire has a cogeneration plant run on methane from an adjacent landfill, providing the university with 100% of its heat and power needs without burning oil or natural gas. North Dakota State University (NDSU) in Fargo, North Dakota has used district heating for over a century from their coal-fired heating plant. Asia Japan 87 district heating enterprises are operating in Japan, serving 148 districts. Many companies operate district cogeneration facilities that provide steam and/or hot water to many of the office buildings. Also, most operators in the Greater Tokyo serve district cooling. China In southern China (south of the Qinling–Huaihe Line), there are nearly no district heating systems. In northern China, district heating systems are common. Most district heating system which are just for heating instead of CHP use hard coal. Since air pollution in China has become quite serious, many cities gradually are now using natural gas rather than coal in district heating system. There is also some amount of geothermal heating and sea heat pump systems. In February 2019, China's State Power Investment Corporation (SPIC) signed a cooperation agreement with the Baishan municipal government in Jilin province for the Baishan Nuclear Energy Heating Demonstration Project, which would use a China National Nuclear Corporation DHR-400 (District Heating Reactor 400 MWt). Building cost is 1.5 billion yuan ($230 million), taking three years to build. Turkey Geothermal energy in Turkey provides some district heating, and residential district heating and cooling requirements have been mapped. Market penetration Penetration of district heating (DH) into the heat market varies by country. Penetration is influenced by different factors, including environmental conditions, availability of heat