electricity comes from organic fuel sources. Xcel Energy has contracts for about 110 megawatts of electricity from biomass generators. Two in northern Minnesota are fueled by forest harvest residue, such as treetops and limbs. A third facility, brought on line in 2007 in western Minnesota, generates power using turkey litter. Xcel Energy's Bay Front plant in Ashland, Wisconsin, is a three-unit generating station that has become a model for the creative use of fuels: coal, waste wood, railroad ties, discarded tires, natural gas, and petroleum coke. Two of the three Bay Front operating units already use biomass as their primary fuel. Xcel Energy recently proposed a plan to install biomass gasification technology at Bay Front. The waste-to-energy facilities use waste that would otherwise end up in landfills. The Wisconsin waste-to-energy plant burns wood waste in combination with refuse-derived fuel (RDF). Xcel Energy owns and operates two nuclear power plants: Monticello Nuclear Generating Plant near Monticello, Minnesota Prairie Island Nuclear Generating Plant near Red Wing, Minnesota and stores the spent fuel from these nuclear plants on site in independent spent fuel storage installations. (ISFSIs). System information and transmission Xcel Energy operates the fourth largest transmission system in the United States, spanning 10 states. In 2011, Xcel Energy's transmission system was worth $3.3 billion. The transmission system is operated on a non-discriminatory basis under the open access requirements of the Federal Government. This means that all wholesale buyers and sellers of electricity can use the transmission system under the same terms and conditions used to serve Xcel Energy's own retail customers. The transmission lines are utilized to carry 115,000 volts, 230,000 volts, and 345,000 volts. There is also a 500,000 volt transmission line that runs from the Dorsey Substation outside of Winnipeg, Manitoba in Canada to the Chisago Substation located in Chisago County just north of St. Paul, Minnesota. Grid security In 2017, Xcel Energy partnered with the Financial Services Information Sharing and Analysis Center to create a new "threat information sharing community" intended to share cyber and physical security intelligence with the energy sector. The new community is called the Energy Analytic Security Exchange (EASE). It is run by the FS-ISAC Sector Services team; FS-ISAC is an organization that gathers cyber and physical risk intelligence for the financial services industry. Additionally, the North American Electric Reliability Council (NERC) manages the Electricity Information Sharing and Analysis Center, which is another resource that