CenTrio, formerly known as the Seattle Steam Company, is a district heating public utility that provides steam (generated by burning natural gas, diesel oil, and recycled wood) to over 175 businesses in downtown Seattle and on First and Capitol Hills via 18 miles of steam pipeline. [1] Its plants are located on Western Avenue at Union Street, just west of Pike Place Market, and on Post Avenue at Yesler Way, in Pioneer Square.
Seattle Steam was founded in 1893 as the Seattle Steam Heat and Power Co. It owns 18 miles of pipes under the streets of Downtown. Its average winter output is 250,000 to 300,000 pounds (110,000 to 140,000 kg) of steam per hour; this drops to less than 100,000 pounds (45,000 kg) in the summer. [1]
Seattle Steam's biggest customers are Swedish Medical Center, Harborview Medical Center, and Virginia Mason Medical Center, which use the steam for heat and sterilization. Other big customers include hotels, which use the steam for heat and for generating hot water, Seattle Public Library, which uses it for heat and the Seattle Art Museum, which uses it for heat and humidity control.
In May 2014, Seattle Steam was bought by Enwave Energy Corporation, a unit of Brookfield Asset Management of Toronto, and renamed Enwave Seattle. [2] [3]
Cogeneration or combined heat and power (CHP) is the use of a heat engine or power station to generate electricity and useful heat at the same time.
Consolidated Edison, Inc., commonly known as Con Edison or ConEd, is one of the largest investor-owned energy companies in the United States, with approximately $12 billion in annual revenues as of 2017, and over $62 billion in assets. The company provides a wide range of energy-related products and services to its customers through its subsidiaries:
Enwave Energy Corporation is a Canadian multinational energy company based in Toronto that focuses on sustainable district energy including heating, cooling, hot water, combined heat and power, and geothermal energy systems. It is one of the largest district energy systems in North America and has been referred as the leading energy district system with 17 heating plants, 21 chilled water plants and ice on coil storage tanks. It serves over 700 customers including commercial properties, developers, municipalities, health care, educational centres and residential units.
Southern California Edison, the largest subsidiary of Edison International, is the primary electricity utility for much of Southern California. It provides 15 million people with electricity across a service territory of approximately 50,000 square miles. However, the Los Angeles Department of Water and Power, San Diego Gas & Electric (SDG&E), Imperial Irrigation District, and some smaller municipal utilities serve substantial portions of the southern California territory. The northern part of the state is generally served by the Pacific Gas & Electric Company of San Francisco. Other investor-owned utilities (IOUs) in California include SDG&E, PacifiCorp, Bear Valley Electric, and Liberty Utilities.
AES Indiana, formerly known as Indianapolis Power & Light Company, is an American utility company providing electric service to the city of Indianapolis. It is a subsidiary and largest utility of AES Corporation, which acquired it in 2001. AES Indiana provides electric service to more than 500,000 customers in a 528-square-mile (1,370 km2) service territory.
A fossil fuel power station is a thermal power station which burns a fossil fuel, such as coal or natural gas, to produce electricity. Fossil fuel power stations have machinery to convert the heat energy of combustion into mechanical energy, which then operates an electrical generator. The prime mover may be a steam turbine, a gas turbine or, in small plants, a reciprocating gas engine. All plants use the energy extracted from the expansion of a hot gas, either steam or combustion gases. Although different energy conversion methods exist, all thermal power station conversion methods have their efficiency limited by the Carnot efficiency and therefore produce waste heat.
The utilities of Seattle are provided by two government owned, and five privately owned, public utilities. The public utilities are Seattle Public Utilities (SPU) for the water supply and waste management, and Seattle City Light for electricity. The private companies are Puget Sound Energy for natural gas; Enwave Seattle for district heating; CenturyLink for telephone service, DSL and FTTH; and Comcast and Wave Broadband for cable television and cable internet.
District heating is a system for distributing heat generated in a centralized location through a system of insulated pipes for residential and commercial heating requirements such as space heating and water heating. The heat is often obtained from a cogeneration plant burning fossil fuels or biomass, but heat-only boiler stations, geothermal heating, heat pumps and central solar heating are also used, as well as heat waste from factories and nuclear power electricity generation. District heating plants can provide higher efficiencies and better pollution control than localized boilers. According to some research, district heating with combined heat and power (CHPDH) is the cheapest method of cutting carbon emissions, and has one of the lowest carbon footprints of all fossil generation plants.
Florida Power & Light Company (FPL), the principal subsidiary of NextEra Energy Inc., is the largest power utility in Florida. It is a Juno Beach, Florida-based power utility company serving roughly 5 million customers and 11 million people in Florida. It is a rate-regulated electric utility that generates, transmits, distributes and sells electric energy. In 2020, the company was ranked as the nation's most reliable electric power utility for the fifth time in six years.
Duke Energy Corporation is an American electric power and natural gas holding company headquartered in Charlotte, North Carolina.
The Southern California Gas Company is a utility company based in Los Angeles, California, and a subsidiary of Sempra. It is the primary provider of natural gas to Los Angeles and Southern California.
The Hartford Electric Light Company (HELCO) is a defunct electrical company that was located on Pearl Street in Hartford, Connecticut. HELCO merged with the Connecticut Power Company in 1958. These merged with the Connecticut Light and Power Company (CL&P) and the Western Massachusetts Electric Company (WMECO) in 1966 to form Northeast Utilities (NU). Its former corporate headquarters building and main facility are in the Ann Street Historic District.
The Lansing Board of Water & Light is a publicly owned, municipal utility that provides electricity and water to the residents of the cities of Lansing and East Lansing, Michigan, and the surrounding townships of Delta, Delhi, Meridian and DeWitt. The Lansing Board of Water & Light also provides steam and chilled water services within the City of Lansing.
Evergy, Inc. is an American investor-owned utility (IOU) with publicly traded stock with headquarters in Topeka, Kansas, and in Kansas City, Missouri. The company was formed from a merger of Westar Energy of Topeka and Great Plains Energy of Kansas City, parent company of Kansas City Power & Light. Evergy is the largest electric company in Kansas, serving more than 1.7 million residential, commercial and industrial customers in Kansas and Missouri. Its more than 40 power plants have generating capacity of 16,000 megawatt electricity in Kansas and Missouri. Service territory covers 28,130 square miles (72,900 km2) in east Kansas and west Missouri. It owns more than 10,100 miles (16,300 km) of transmission lines and about 52,000 miles (84,000 km) of distribution lines.
The Willis Avenue Station is a steam production plant used in Detroit's district steam heating system. The plant is located at 50 West Willis Street, near Woodward Avenue, in the center of the city's Midtown Detroit neighborhood. Built and owned by the Detroit Edison Company, it was listed on the National Register of Historic Places in 1997.
Madison Gas and Electric Company (MGE) is the primary subsidiary of MGE Energy, Inc.. As a regulated utility, it primarily serves the Madison, Wisconsin metropolitan area with electricity, gas and green energy options.
Martin Next Generation Solar Energy Center is the solar parabolic-trough component of an integrated solar combined cycle (ISCC) 1150 MW plant, in western Martin County, Florida, United States, just north of Indiantown. The project was built by Florida Power & Light Company (FPL). Lauren Engineers & Constructors (Abilene, TX) was the EPC contractor for the project. Its construction began in 2008 and was completed by the end of 2010.
Perry K. Generating Station is a small multi-fired power station producing steam for one of the largest central district steam heating systems in the United States. The plant is located on the south side of downtown Indianapolis, at the intersection of Kentucky Avenue and West Street. Its coal-fired units were among the oldest operating power plants in the United States at the time, and were converted to natural gas in 2016. Perry K. is owned by Citizens Thermal, a division of Citizens Energy Group.
Blackburn power stations are a series of electricity generating stations that have provided electric power to the town of Blackburn and the wider area from 1895 to the present. The first station in Jubilee Street, Blackburn began operating in 1895. A new larger station known as Blackburn East or Whitebirk power station was commissioned in 1921 and was rebuilt in stages over the period 1942 to 1955. Whitebirk station closed in 1976. The 60 MW Blackburn Mill Combined Cycle Gas Turbine (CCGT) power station has generated electricity since 2002. The Blackburn energy from waste (EfW) plant is currently (2020) being planned.
Gateway Generating Station (GGS), formerly Contra Costa Unit 8 Power Project, is a combined-cycle, natural-gas-fired power station in Contra Costa County, California, which provides power to half a million customers in northern and central California. Gateway Generating Station is on the southern shore of the San Joaquin River, in Antioch, and is one of more than ten fossil-fuel power plants in Contra Costa County.
