Chronological List of District Heating Systems in the United States

| History of District Heating in the United States | District Heating Studies |

District Heating Summary Document (pdf)

This is a list of all commercial district heating systems in the United States, with the year of initial operation, owner(s), and the year when the system shut down if it is not still operating. Where two or more systems operated in the same city and ended up under common ownership, they are shown as a single system with notes. Several small district heating systems in Alaska are not included here.

Several early institutional district heating systems are also listed.

Several lists of district heating systems were published between 1900 and 1917, but additional evidence of their existence was required for inclusion in this list such as a mention in a local history or in a newspaper or journal article. Additional systems no doubt exist and will be added as they are confirmed. Some systems were sold several times and an attempt has been made to include the first and last owners.

Dates shown in italics are approximate. The OP No. column indicates systems that are currently operating and are also shown in bold. The HW column identifies hot water systems installed between 1894 and 1910. The last of these early hot water systems was shut down in Perry, Iowa on June 14, 1981. An "H" prefix shows systems using high-temperature hot water, a "G" for geothermal hot water systems, and an "E" for more recent systems using European EN-253 piping systems, the first of which began service in Willmar, Minnesota in September 1982. Where "Exhaust steam" is shown in the Notes column, that term was used to describe the system, but most systems built between 1890 and 1918 either distributed exhaust steam or used it to heat hot water. "ADSCO exhaust steam" indicates those systems where it is known that the American District Steam Company installed the piping network. Many systems using exhaust steam also distributed live steam from boilers.

This list is a work in progress and based on the best available evidence, please send any updates or corrections to me at: m.pierce@rochester.edu .

No.	HW	Op No.	Year	City	State	Owner	Shut Down	Notes
			1811	Middletown	CT	Middletown Manufacturing Company		First use of cogeneration in America
			1826	Economy	PA	Harmony Society		Exhaust from steam engines heated several buildings.
			1852	Baltimore	MD	Thomas Winans		Natural circulation hot water system heated several buildings on the Alexandroffsky estate.
			1853	New York City	NY	New York Crystal Palace		A separate boiler plant supplied steam power
			1853	Annapolis	MD	United States Naval Academy		Gas & steam plant built.
			1864	Poughkeepsie	NY	Vassar College		Separate boiler plant installed to heat college.
			1866	Taugus	ME	National Home for Disabled Volunteer Soldiers		One of four homes built by 1870
			1867	West Point	NY	United States Military Academy		Separate boiler plant built.
			1876	Philadelphia	PA	Centennial Exposition		Four boiler plants provides steam for engines
1			1877	Lockport	NY	Holly Steam Combination Company (limited) American District Steam Company (1881) Economy Light, Fuel & Power Co. (1903) New York State Electric & Gas Co.	1969
2			1878	Auburn	NY	Auburn Steam Heating Company	1926
3			1878	Detroit (1)	MI	Detroit Steam Supply Company	1884
4			1878	Springfield (1)	MA	Springfield Gas Light Company	1903
5			1879	Milwaukee (1)	WI	Milwaukee Steam Supply Company	1881
6			1879	Troy	NY	Troy Steam Heating Company	1884
7			1879	Belleville	IL	Belleville Steam Supply Company	1886
8			1879	Dubuque	IA	Dubuque Steam Supply Company	1894
9			1879	Garden City	NY	A. T. Stewart Estate	1880	System taken over by local church.
10			1880	Burlington	IA	Burlington Steam Supply Company	1920
11		1	1880	Denver	CO	Denver City Steam Heating Company Public Service Company of Colorado (1909)		Oldest commercial district heating company in North America; Oldest commercial steam heating company in the world.
12			1881	Lynn	MA	Citizens' Steam and Gas Company of Lynn	1883	Holly double system
13			1881	Hartford (1)	CT	Hartford Steam Company	1892
14			1882	New Haven	CT	New Haven Heat Supply Company	1908	Holly double system
15		2	1882	New York City (1)	NY	New York Steam Company New York Steam Corporation (1921) Con Ed (1954)		Largest district heating system in North America. Con Ed Steam
16			1882	New York City (2)	NY	American Heating and Power Company	1883
17			1883	Clearfield	PA	Clearfield Steam Heating Company	1956
18			1883	Philipsburg	PA	Philipsburg Electric Light, Gas, Power and Heating Company	1957
19	E2	3	1884	Saint Paul (1)	MN	Economy Steam Heat Company St.Paul Light, Heat and Power (1891) Northern States Power (1910) District Energy St. Paul (1981)		Converted to hot water in 1983. District Energy St. Paul
20			1884	Bellefonte	PA	Bellefonte Electric Light, Steam Heating and Motive Power Company	1918
21			1884	Williamsport	PA	Williamsport Steam Company	1917
22			1884	Lock Haven	PA	Lock Haven Illuminating, Power and Heating Company	1917
			1885	Lawrence	MA	Edison Electric Illuminating Co of Lawrence	1900	First electric company to sell exhaust steam; only warmed buildings on the same block
23	H1		1886	Washington	DC	Washington Heat & Power Co.	1889	Prall high-temperature hot water system
24			1886	Topeka (1)	KS	Topeka Steam Heating Company	1889
25			1886	Bloomsburg	PA	Bloomsburg Steam and Electric Light Company	1968	Exhaust steam heating
26			1886	Tyrone	PA	Home Electric Light and Steam Heating Company	1946
27			1886	Wilkes-Barre	PA	Wilkes-Barre Heat, Light & Motor Co. Pennsylvania Power & Light (1923) Wilkes-Barre Steam Heat (1951) Steam Heat Authority (1976)	1990
28		4	1887	Harrisburg	PA	Harrisburg Steam Heat & Power Company Harrisburg Light & Power Company (1913) Pennsylvania Power & Light (1928) Harrisburg Steam Works (December 1985) Statoil (1997) NRG Thermal (2000) Cordia Energy (2022)		Now owned by Cordia Energy
39			1887	Reading	PA	Reading Steam Heat and Power Company	1968
30			1888	Attleboro	MA	Attleboro Steam & Electric Company	1920
31	H2		1888	Boston (1)	MA	Boston Heating Company	1889	Prall high-temperature hot water system
32			1888	Hazleton	PA	Hazleton Steam Heating Company	1920
33			1888	Pottsville	PA	Pottsville Steam Heat & Power Company	1972
34			1888	Allentown	PA	Allentown Steam Heating & Power Company	1968
35			1888	Lebanon	PA	Lebanon Steam Company	1966
36			1888	Salt Lake City	UT	Salt Lake Power, Light and Heating Company	1996	Heating plant sold to LDS Church.
37			1889	Ackley	IA	Ackley Electric Light & Heating Co City of Ackley (1906)	1933	Homemade exhaust steam
38			1889	Ottumwa	IA	Ottumwa Electric and Steam Company	1956	ADSCO exhaust steam
39	44	5	1889	Indianapolis	IN	Marmon-Perry Light Company Home Heating and Lighting Company Indianapolis Power & Light (1927)		Yaryan hot water system installed in 1902; converted to steam in 1929. Now owned by Citizens Energy
40		6	1889	Kansas City	MO	Edison Electric Lighting Company Trigen (1990)		Exhaust steam Now owned by Vicinity Energy
41		7	1889	Philadelphia	PA	Edison Electric Light Company of Philadelphia Philadelphia Steam Company Catalyst Thermal Energy Corporation (1986) Trigen		Now owned by Vicinity Energy
42			1889	Syracuse	NY	Syracuse Heat & Power Company Municipal Heating Company of Syracuse (1903)	1910
43			1889	Chester	PA	Chester Steam Heating and Power Company	1900	Exhaust steam
44			1890	Duluth (1)	MN	Duluth-Edison Electric Co	1920	Exhaust steam
45			1890	Springfield	IL	Springfield Electric Light and Power	1968	Exhaust steam
46			1890	Missoula	MT	Missoula Mercantile Company Missoula Light & Water Company (1906)	1960
47			1890	Wayne	PA	Wayne Steam Company Wayne Steam Heat Company (1913)	1949
48		8	1890	Seattle	WA	Seattle Steam Heat & Power Company Seattle Electric Company (1900) Puget Sound Power & Light Co. (1912) Seattle Steam Corporation (1951) Enwave/CenTrio (2014)		Owned by CenTrio
49	39		1891	Des Moines	IA	Des Moines Steam Heating Co. Iowa Light, Heat & Power Co.	1905	Added hot water 1902
50			1891	Sioux City	IA	Boston Investment Company	1980
51			1891	Presque Isle	ME	Presque Isle Electric Company	1920
52			1891	Buffalo (1)	NY	Thompson-Houston Company Buffalo General Electric	1897
53		9	1891	Greece	NY	Eastman Kodak Company RED-Rochester LLC (2013)		RED-Rochester, LLC
54			1891	Tacoma	WA	Syndicate Heat & Power Tacoma District Heating Co Consumers Central Heating Co (1919)	1979
55	19		1892	Carroll	IA	Carroll Electric Light & Power Co. Iowa Public Service Company	1973	Exhaust steam initially, replaced by hot water in 1900
56		10	1892	Cedar Rapids	IA	Cedar Rapids Electric Light and Power Co. Iowa Power & Light		Provides high pressure steam to two customers. Alliant Energy
57			1892	Grinnell	IA	Grinnell Electric Light Co Grinnell Electric & Heating Co. Iowa Southern Utilities	1960	Exhaust steam
58			1892	Malvern	IA	Malvern Light & Power Continental Gas & Electric	1925
59			1892	Marion	IA	Addison L. Daniels Gas & Electric Works Marion Light, Heat & Power Co Iowa Electric Light & Power	1940	Exhaust steam
60	G1	11	1892	Boise (1)	ID	Artesian Hot and Cold Water Company Boise Warm Springs Water District		Geothermal Hot Water Boise Warm Springs Water District
61			1892	Pittsfield	MA	Pittsfield Electric Light Company Western Massachusetts Electric Co	1971	Exhaust steam
62			1892	St. Joseph	MO	St. Joseph Light & Power Co.	1978	Exhaust steam
63			1892	Brooklyn	NY	Edison Electric Illuminating Co.	1905	Live steam for power and exhaust steam for heating
64			1892	Shenandoah	PA	Shenandoah Heat & Power Company Home Steam Heat and Power Company (1906)	1919	Exhaust steam
65			1893	Aurora	IL	Aurora Street Railway Company	1964	Exhaust steam
66			1893	Sycamore	IL	DeKalb-Sycamore Electric Co Illinois Power Co.	1941
67			1893	Winona	IL	Warsaw General Electric Co, Winona Electric Light & Water Co	1923
68			1893	Overbrook	PA	Overbrook Steam Heat Company	1973
69			1894	Butte	MT	Phoenix Electric Light & Steam Heating Co	1950
70			1894	Fredonia	NY	Dunkirk & Fredonia Railway Company Central Station Heating and Construction Company (1910)	1916
71		12	1894	Rochester	NY	Rochester Gas & Electric Corporation Rochester District Heating Cooperative (1985)		Rochester District Heating Cooperative
72	1		1894	Toledo	OH	Central Chandelier Co. Home Heating & Lighting Co. Toledo Gas, Electric & Heating Company (1905) Toledo Railways & Light Company Toledo Edison Company	1985	Yaryan hot water system Residential hot water service discontinued in the early 1940s; business district hot water service discontinued in 1965 Steam discontinued 1985
73			1894	Scranton	PA	Economy Steam Heat Company Scranton Electric Company (1907) Scranton Steam Heat Company (1956) Community Central Energy Corporation (1973)	2006
74			1895	Eagle Grove	IA	Eagle Grove Electric Iowa Public Service	1980	Plant sold to Ag Processing, Inc.to produce steam and electricity for their food processing facility.
75			1895	Spencer (1)	IA	Spencer Electric Light & Power Co	1901	Homemade exhaust steam
76			1895	Webster City	IA	City of Webster	1970	Exhaust steam
77			1895	Danville	IL	Danville Electric Light and Power Co	1960
78		13	1895	Boston (2)	MA	Edison Electric Illuminating Company Catalyst Energy Corp (1986)		Now owned by Vicinity Energy
79			1895	Germantown	PA	Germantown Steam Company	1963
80			1896	Davenport	IA	Davenport Consolidated Gas, Electric Light and Steam Heating Company Peoples Light Company (1917)	1942
81			1896	Eldora	IA	Eldora Electric Company Iowa River Light & Power	1917
82			1896	Greenville	PA	Peoples Electric Light, Heat & Power Company Mercer County Light, Heat and Power Company (1916)	1921
83			1896	Towanda	PA	Towanda Electric Illuminating Company City Heat Company	1963	Exhaust steam
84			1897	Davenport	IA	Davenport Gas & Electric Co	1943
85			1897	Muscatine	IA	Muscatine Electric Railway Co.	1902
86			1897	Taylorville	IL	Steam Heating Plant of Taylorville Taylorville Gas & Electric Company (1905) Central Illinois Public Service Company Taylorville Heat Cooperative (1951)	1978	ADSCO exhaust steam
87	2		1897	La Porte	IN	La Porte Electric Company	1952	Yaryan hot water system
88			1897	Topeka (2)	KS	Edison Electric Illuminating Company Illinois Traction (1910) Kansas Power & Light (1927)	1984	Exhaust steam
89			1897	Cumberland	MD	Edison Electric Illuminating Company of Cumberland Potomac Edison (1923)	1964
90		14	1897	Grand Rapids	MI	Edison Electric Light Company Consumers Energy Company (1915) Kent County (1962) Veolia (2006)		Now owned by Vicinity Energy
91			1897	Laconia	NH	Belknap Electric Power Company	1920
92			1897	Newburgh	NY	Consolidated Gas, Electric Light, Heat, & Power Co of Newburgh Newburgh Light, Heat & Power Company Central Hudson Gas and Electric Company	1953
93			1897	Tiffin	OH	Tifflin Edison Illuminating Company Ohio Edison (1911)	1916
94			1897	Mahanoy City	PA	Anthracite Light, Heat & Power Company Pennsylvania Power & Light Company (1929)	1930
95		15	1897	Milwaukee (2)	WI	Central Heating Company Wisconsin Electric Company		Owned by WE Energies
96			1898	Grundy Center	IA	Grundy Center Electric Light Co City of Grundy	1973
97	3		1898	Missouri Valley	IA	Missouri Valley Electric Company	1962	Yaryan hot water; converted to steam around 1929
98			1898	Parkersburg	IA	Parkersburg Electric Light, Heat & Power Co	1914	Exhaust steam
99			1898	Chicago	IL	Illinois Maintenance Company	1979
100	4		1898	Mattoon	IL	Mattoon Heat, Light and Power Company	1935	Yaryan hot water system
101			1898	Fort Scott	KS	Fort Scott Steam Heating Co Fort Scott Gas & Electric Co (1901) Community Power & Light (1922) Kansas City Power & Light (1952)	1952	ADSCO exhaust steam
102			1898	Erie	PA	Home Heating Company Erie Lighting Company (1899) Pennsylvania Electric Company (1942)	1991	Building now houses the Erie Maritime Museum
103			1898	York	PA	York Steam Heating Company Metropolitan Edison	1977	Exhaust steam
104			1898	Geneva	NY	Geneva NY Geneva Steam Heating Company Empire Gas & Electric Company	1908
105			1898	Hornell	NY	American Heating Company Hornell Electric Company New York State Electric & Gas Corporation	1948
106			1898	Penn Yan	NY	Penn Yan Steam Heating Company	1948
107			1898	Springfield	OH	Springfield Light, Heat & Power Co Ohio Edison	1980
108	5		1898	La Crosse	WI	La Crosse Gas & Electric Company	1969	Yaryan hot water system
109	6		1898	Portage	WI	Portage Electric Light Company	1951	Yaryan hot water system
110	7		1899	Boone	IA	Boone Heating Company Iowa Electric Light & Power	1962	Yaryan hot water system
111	8		1899	Ida Grove	IA	Ida Grove Electric Company Iowa Public Service Company	1966	Yaryan hot water system
112	9		1899	Iowa Falls	IA	Iowa Falls Electric Light & Power Co. Iowa Electric Light & Power	1963	Yaryan hot water system
113	10		1899	Mason City	IA	Brice Gas and Electric Company Interstate Power Company	1970	Yaryan hot water system
114	11		1899	Perry	IA	Iowa Electric Light & Power	1981	Yaryan hot water system
115	12		1899	Red Oak	IA	Red Oak Electric Light Company Iowa Power & Light	1954	Evans-Almirall hot water system
116	13		1899	Alton	IL	Alton Gas & Electric Company	1918	Yaryan hot water system
117			1899	Hillsboro	IL	Hillsboro Electric Co	1924
118	14		1899	Jerseyville	IL	Jerseyville Light, Heat & Power Co Central Illinois Public Service Company (1912)	1916	Yaryan hot water; converted to steam around 1912
119			1899	La Salle	IL	Marquette Heat & Light Co	1920
120			1899	Pekin	IL	Pekin Electric Co. Central Illinois Power	1934
121			1899	Watseka	IL	Watseka Electric Company Central Illinois Public Service	1917
122	15		1899	Waukegan	IL	Waukegan Electric Co.	1924	Hot water
123	16		1899	Terre Haute	IL	Terre Haute Traction & Light Company Citizens Mutual Heating Company (HW)	1947	Hot water discontinued 1947
124			1899	Crookston	MN	Crookston Water Works, Power & Lighting Red River Valley Power (1924) Interstate Power (1926)	1926	ADSCO exhaust steam
125			1899	St. Cloud	MN	Benton Power & Traction Company St. Cloud Light, Heat, Transit and Public Service Company	1905
126			1899	Sedalia	MO	Sedalia Steam Heating Company Economy Steam Heating & Lighting	1920
127			1899	Newark	NY	Newark Light, Heat and Power Company Central New York Gas and Electric Company	1919
128			1899	Mt. Pleasant	PA	People's Heating Co	1915
129			1899	Wilkinsburg	PA	Pennsylvania Heat & Power Co.	1915
130			1899	Pawtucket	RI	Pawtucket Electric Co	1920
131	17		1899	Kenosha	WI	Kenosha Gas & Electric Company Wisconsin Gas & Electric (1912)	1921	Schott hot water system
132			1899	Marinette	WI	Marinette Electric Light & Street Railway Co Menominee and Marinette Light and Traction (1903)	1915
133			1900	Colorado Springs	CO	Colorado Springs Electric Company Colorado Springs Light, Heat & Power Co (1910)	1920	Exhaust Steam
134			1900	Waterbury	CT	Connecticut Light & Power	1926
135			1900	Atlanta	GA	Atlanta Steam Company Georgia Power (1902)	1988
136	19		1900	Cresco	IA	Cresco Light, Heat & Power Interstate Power (1912)	1912	Hot water
137	20		1900	Bloomington	IL	A. E. Demange Consumers Heat and Electric Company City District Heating Company Bloomington & Normal Railway, Electric & Heating Company Illinois Power & Light	1971	Hot water discontinued in 1923
138			1900	Champaign	IL	Urbana & Champaign Railway, Gas & Electric Illinois Power	1959
139			1900	Charleston	IL	Charleston Light, Heat & Power Co.	1921
140	21		1900	Evanston	IL	Evanston Yaryan Co. Public Service Company of Northern Illinois	1949	Yaryan hot water system
141			1900	Paris	IL	Paris Gas Light & Coke Co. Central Illinois Public Service Co	1929	Yaryan hot water
142	22		1900	Paxton	IL	Paxton Electric Company Central Illinois Utilities (1913)	1927	Hot water initially, converted to steam after 1912.
143			1900	Peoria	IL	Peoria Gas & Electric Co.	1971
144			1900	Urbana	IL	Urbana Light, Heat & Power Illinois Power Co	1957
145			1900	Augusta	ME	Kennebec Light & Heat Central Maine Power	1912
146			1900	Houghton	MI	Peninsula Light & Heat Company Houghton County Electric Company	1910
147			1900	Menominee	MI	Menominee Electric Light & Street Railway Menominee and Marinette Light and Traction (1903)	1915
148	23		1900	Owatonna	MN	Owatonna Electric Light & Heating Co. City of Owatonna (1925)	1982	Yaryan hot water; converted to steam in 1925 after city bought the system.
149			1900	Bismarck	ND	Hughes Electric Co. Montana-Dakota Utilities	1967	Exhaust steam
150			1900	Fargo	ND	Hughes Electric Co Light, Heat, Transit and Public Service Company of Fargo	1971
151			1900	Grand Forks	ND	Grand Forks Gas & Electric Co	1970	ADSCO exhaust steam
152		16	1900	Cleveland (1)	OH	Cleveland Electric Railway Company Cleveland Electric Illuminating Company Catalyst Thermal Energy (1987) Mid-America Energy (1991) Corix Utilities (2015)		Owned by Corix Cleveland Thermal
153	24		1900	Delaware	OH	Gwynne Central Station Heating Company Delaware Electric Light Heat and Power Co. Ohio Utilities (1918) Columbus and Southern Ohio Electric (1929)	1957	Yaryan hot water system Residential hot water service discontinued around 1920 Heating plant sold to Ohio Wesleyan University around 1975
154		17	1900	Youngstown	OH	Youngstown Steam Heating Company Mahoning County Light Company (1915) Youngstown Thermal Energy (1980) SOBE Thermal Energy Systems, LLC. (2019)		SOBE Thermal Energy Systems, LLC.
155			1900	Johnstown	PA	Johnstown Steam Heat Company Johnstown Light, Heat, and Power Company (1902) Pennsylvania Electric Company (1944)	1969
156			1900	Washington	PA	Washington Steam Heating Co Washington Elec Lt & Power Co (1902) West Penn Power Company (1911)	1920
157			1900	Cleburn	TX	Cleburn Electric Light Co	1920
158			1900	Waxahachie	TX	Waxahachie Electric Light Co	1910
159	25		1900	Janesville	WI	Janesville Electric Co.	1912	Hot water
160			1901	Idaho Springs	CO	Seaton Mountain Electric Light, Heat and Power Co.	1919	Exhaust steam
161			1901	Buxton	IA	Consolidation Coal Company	1925
162			1901	Centerville	IA	Citizens Electric Light and Gas Co Iowa Southern Utilities	1961
163			1901	New Hampton	IA	Electric Light Company City of New Hampton	1963
165			1901	Spirit Lake	IA	B. F. Stevens Town of Spirit Lake (gift from Stevens)	1980
166	26		1901	Bowling Green	IL	Bowling Green Electric Light & Power Co Lake Erie Bowling Green & Napoleon Electric Railway	1916	Hot water
167			1901	Oak Park	IL	Oak Park Light, Heat & Power Co. Public Service Company of Northern Illinois	1958
168			1901	Quincy	IL	Quincy Steam Heating Co Central Illinois Public Service Co	1951
169			1901	Pontiac	IL	Pontiac Electric Light and Power Co Public Service Company of Northern Illinois	1931	ADSCO exhaust steam
170			1901	Urbana	IN	Urbana Light, Heat & Power Co. Illinois Power	1957
171	27		1901	Bedford	IN	Bedford Light, Heat & Power Co.	1921	Schott hot water
172	28		1901	Bloomington	IN	Central Indiana Lighting Co.	1920	Hot water
173	29		1901	Boonville	IN	Boonville Electric Light & Power Co. Southern Indiana Gas & Electric (1930)	1941	Hot water
174	30		1901	Marion	IN	Marion Lighting & Heating Co.	1957	Hot water
175			1901	Muncie	IN	Muncie Electric Light Co.	1966	Exhaust steam
176	31		1901	Noblesville	IN	Noblesville, Heat, Light & Power Co.	1939	Hot water
177	32		1901	Princeton	IN	Princeton Light & Power	1924	Yaryan hot water
178			1901	Rochester	IN	Rochester Light, Heat & Power Co.	1942	Exhaust steam
179	33		1901	Sullivan	IN	Sullivan Heat, Light & Power Co	1908	Hot water
180		18	1901	Lansing	MI	lmanz A. Piatt and Fred B. Piatt Piatt Power and Heat Company (1904) Michigan Power Company (1906) Lansing Board of Water and Light (1919)		Lansing Board of Water and Light
181	34		1901	Albert Lea	MN	Albert Lea Electric Co Minnesota Gas & Electric (1911) Interstate Power	1957	Evans-Almirall hot water; converted to steam in 1922
182			1901	Long Prairie	MN	City of Long Prairie	1919
183			1901	Pipestone	MN	Pipestone Electric Light , Heat and Power Northwest Light & Power (1914) Northern States Power (1917)	1920
184			1901	Glendive	MT	Eastern Montana Light & Power Montana-Dakota Utilities Company	1962
185			1901	Dunkirk	NY	A. W. Cummings Dunkirk Power and Heating Company	1917
186	35		1901	Bowling Green	OH	Bowling Green Electric Light & Power Lake Erie, Bowling Green & Napoleon Railway Co	1920	Yaryan hot water system
187	36		1901	Columbus	OH	Indianola Land & Power Company Columbus Railway & Light	1905	Yaryan hot water system Exhaust Steam
188	37		1901	Coshocton	OH	Merchants Electric Light & Power Company Coshocton Light & Heating Company	1928	Schott hot water system
189			1901	Leipsic	OH	Leipsic Light, Heat & Power North Western Ohio Light Co (1915)	1920
190			1901	Van Wert	OH	Public Service Company of Van Wert	1917
191	38		1901	Washington Court House	OH	Washington-Smead Hot Water Company Washington Heat & Electric (1906) Dayton Power & Light (1926)	1950	Smead hot water system
192			1901	Montrose	PA	Montrose Electric Light, Heat and Power Co.	1915
193			1901	Renovo	PA	Renovo Edison Light, Heat and Power Co Renovo Heat Company (1912)	1970
194			1902	Bristol	CT	Bristol & Plainville Tramway Co Connecticut Light & Power (1927) Bristol Steam Heat Co (1945)	1947
195	40		1902	Belvidere	IL	Belvidere Gas & Electric Illinois Northern Utilities (1912) Belvidere Heating Company (1920)	1940	Initially Yaryan hot water, some customers converted to steam in 1920 when hot water was discontinued.
196			1902	Clinton	IL	Clinton Gas Company Illinois Power Company	1947	ADSCO exhaust steam
197			1902	Rockford	IL	Central Heat & Power	1973
198			1902	Tuscola	IL	Tuscola Water & Light Tuscola heat consumers	1923
199			1902	Brazil	IN	A. Dinkle Florist	1907
200	41		1902	Connersville	IN	Light Heat & Power Co.	1920	Hot water
201	42		1902	Elwood	IN	Elwood Electric Light Co.	1935	Hot water
202	43		1902	Fowler	IN	Fowler Utilities Co. Interstate Public Service	1920	Hot water
203	45		1902	Lafayette	IN	Merchants Heating and Lighting Company	1947	Schott hot water system
204	46		1902	New Castle	IN	New Castle Light, Heat & Power Co.	1926	Hot water
205	47		1902	Peru	IN	Peru Heating Co.	1934	Hot water
206			1902	Salina	KS	Kansas Ice & Storage Co.	1930
207			1902	Detroit Lakes	MN	City of Detroit Lakes	1987
208			1902	Lincoln (1)	NE	Lincoln Heat, Light & Power Lincoln Traction (1909) Iowa-Nebraska Light & Power (1930) Consumers Public Power District (1942) Lincoln Electric System (1964)	1977
209	48		1902	Atlantic City (1)	NJ	New Jersey Hot Water Heating Co.	1960	Hot water
210	49		1902	Ada	OH	Ada Water, Light & Heat Co	1920	Hot water
211			1902	Altoona	OH	Citizens Electric Light, Heat, & Power Co.	1947
212	50		1902	Findlay	OH	Findlay Street Railway Co,	1920	Yaryan hot water system
213	51		1902	Fremont	OH	Fremont Yaryan Co. Ohio Power Co. (1913)	1936	Yaryan hot water system
214			1902	Lima	OH	Ohio Power Co.	1955
215			1902	New Philadelphia	OH	Ohio Service Co.	1952
216			1902	Bangor	PA	Bangor Electric Light, Heat & Power Co. Bangor Steam Heat Co. (1913)	1968
217			1902	Easton	PA	Peoples Steam Heat & Power Co Metropolitan Edison	1967
218			1902	West Chester	PA	Edison Electric Illuminating Co. of West Chester Pennsylvania Electric Company West Chester Steam Heating & Power Co.	1973	Exhaust steam
219			1902	Norristown	PA	Norristown Light & Steam Heat Company	1920
220			1902	Brookings	SD	City of Brookings	1985
221			1903	Birmingham	AL	Birmingham Railway, Light and Power Company Alabama Power Company	2013	Exhaust steam
222			1903	Paducah	KY	Paducah Steam Heating Co Paducah Electric (1919)	1923
223			1903	Clarinda	IA	Lee Electric Light Co Iowa Power & Light	1964
224			1903	Vinton	IA	Iowa Electric Light & Power	1962	Exhaust steam
225			1903	Decatur	IA	Decatur Steam Heating Co. Iowa Power Co.	1957
226			1903	Galesburg	IL	Galesburg Railway & Light Co	1957
227			1903	Lincoln	IL	Lincoln Street Car & Heating Co	1916
228	52		1903	Mt. Vernon	IL	Citizens Gas, Electric & Heating Southern Illinois Light & Power (1919)	1921	Schott hot water system
229			1903	Rensselaer	IL	City of Rensselaer	1940
230			1903	White Hall	IL	White Hall Sewer Pipe & Stoneware Co Central Illinois Public Service Co. White Hall heating consumers	1922
231			1903	Anderson (1)	IN	Home Heating Company Central Heating Company	1925
232		19	1903	Baltimore	MD	Baltimore Refrigerating and Heating Company Baltimore Gas and Electric (1929) Catalyst Thermal Energy Corporation (1985) Trigen (1993) Veolia		Now owned by Vicinity Energy
233			1903	Adrian	MI	Citizens Light & Power Company	1962
234		20	1903	Detroit (2)	MI	Central Heating Company Murphy Power Company Detroit Edison (1914) Detroit Thermal, LLC (2014)		Detroit Thermal, LLC
235			1903	Waterville	NY	Waterville Gas & Electric Company	1922
236	53		1903	Piqua (1)	OH	Miami Light, Heat & Power Company Dayton Power & Light (1915)	1928	Evans-Almirall Hot Water System
237	54		1904	Little Rock	AR	Little Rock Heating Company Central Heating and Manufacturing Co (1907) Little Rock Railway & Electric (1915) Arkansas Power & Light	1952	Schott hot water, converted to steam in 1914
238			1904	Vinton	IA	Vinton Pearl Button Manufacturing Co. Iowa Electric Light & Power (1937)	1961
239			1904	Mooresville	IN	Public Service Co. Mooresville Utilities (1920)	1921	Exhaust steam
240			1904	Carrollton	IL	Carrollton Light, Heat and Power Co Central Illinois Power Co	1921
241			1904	DeKalb	IL	DeKalb Electric Co Northern Illinois Gas Co. (1956)	1957
242			1904	Kewanee	IL	Kewanee Light & Power Co Kewanee Central Heating Co (1925)	1937
243			1904	Pana	IL	Pana Gas, Light, Fuel and Heating Co Pana Gas & Electric (1905) Central Illinois Power Co (1912)	1946
244			1904	Pittsburg	KS	Pittsburg Water Supply Co City of Pittsburg (1911)	1959
245		21	1904	St. Louis	MO	Union Electric Light & Power Company Thermal Resources (1984) Trigen (1993) Ashley Energy (2017)		Distribution system owned by city of St. Louis; Plant owned by Ashley Energy
246			1904	Beaver Dam	WI	Beaver Dam Light & Power Co. Wisconsin Power & Light	1950
247			1904	Cheyenne	WY	Cheyenne Light, Fuel & Power Co.	1979
248		22	1905	Fairbanks	AK	Northern Commercial Company City of Fairbanks (1952) Aurora Energy Company (1998)		Owned by Aurora Energy
249			1905	Walsenburg	CO	Walsenburg Light, Power & Ice Co	1913
250			1905	South Norwalk	CT	City of South Norwalk	1911
251			1905	Morrisonville	IL	Morrisonville Electric Co Southern Illinois Light & Power	1925
252			1905	Mowequa	IL	Mowequa Electric Company Central Illinois Public Service	1916
253			1905	Huntington	IN	The Huntington Light & Fuel Co.	1939	Exhaust steam
254			1905	Thorntown	IN	Town of Thorntown	1927
255			1905	Peabody	MA	City of Peabody	1925
256			1905	Pontiac	MI	Detroit Edison Consumers Power	1930
257			1905	Yale	MI	Village \| City of Yale	1917
258	55		1905	Kirksville	MO	Missouri Heat Light & Power	1965	Hot water
259			1905	Ellendale	ND	Ellendale Electric Co Montana-Dakota Utilities	1964
260			1905	Minot	ND	Minot Light & Telephone Co Northern States Power Co	1965
261			1905	York	NE	York Gas & Electric	1955
262			1905	Waterville	NY	Waterville Gas & Electric Company	1922
263			1905	Oberlin	OH	Oberlin Gas & Electric Co	1923
264			1905	McMinnville	OR	Central Heating Co.	1920
265			1905	Mobridge	SD	Mobridge Light, Heat & Power Co	1980
266			1905	Mineral Point	WI	Mineral Point Electric Light Co	1925
267			1906	Guthrie Center	IA	Guthrie Center Electric Light Co. Iowa Electric Co.	1917
268			1906	Manchester	IA	Manchester Heat, Light & Power Co	1930
269			1906	Story City	IA	City of Story City	1930
270			1906	Stuart	IA	City of Stuart	1930
271			1906	Traer	IA	Traer Electric Company Iowa Railway & Light City of Traer	1974
272			1906	Hoopeston	IL	Hoopeston Gas & Electric	1913
273	56		1906	Mt. Carmel	IL	Mt. Carmel IL New Electric Company Mt. Carmel Public Service & Utility Co.	1920	Hot water
274			1906	Virden	IL	Virden Electric Light Co	1921
275	57		1906	Frankfort	IN	The Frankfort Heating Co.	1920	Hot water
276			1906	McKinley	MN	City of McKinley	1925
277			1906	Mora	MN	Mora Electric Light, Heat & Power Co Eastern Minnesota Power Co. (1917)	1918
278			1906	Missoula	MT	Missoula Light & Water Co	1960
279			1906	Harvard	NE	Harvard Electric Co.	1917
280			1906	Spring Grove	PA	P. H. Glatfelter Co	1949
281			1906	Clifton Forge	VA	Clifton Forge Public Service Co	1917
283			1907	Uniontown	CT	Union Light & Power	1920
284			1907	Canton	IL	Canton IL Canton Gas & Electric Central Illinois Public Service	1937
285			1907	Monmouth	IL	Monmouth Gas & Electric Illinois Iowa Power Company	1938
286			1907	Morton	IL	Morton Light, Heat, Power & Water Co	1915
287		23	1907	Boston (3)	MA	Harvard University: Advanced Energy Partners (1978); Veolia/MSIP (2010) Longwood Energy Partners (2018)		Medical Area Total Energy Plant Owned by ENGIE North America Inc. and Axium Infrastructure (operating jointly as Longwood Energy Partners)
288			1907	Staples	MN	City of Staples	1925
289			1907	Springfield	MO	Springfield Gas & Electric City of Springfield (1945)	1957
290	58		1907	Billings	MT	Billings Mutual Heating Company Billings Utility Company (1914) Billings Gas Company (1938)	1939	Hot water
291			1907	Jamestown	ND	Western Electric Company Otter Tail Power (1924)	1975
292		24	1907	Omaha	NE	Brandeis Investment Company Northern Natural Gas (1968) Energy Systems Company (1985) NRG Thermal (2013)		Owned by Clearway Thermal
293			1907	Canton	OH	Canton Electric Company	1975
294			1907	Dayton	OH	Dayton Citizens Electric Company Dayton Power & Light	1997
295		25	1907	Pittsburgh (1)	PA	Bellefield Boiler Plant		Bellefield Boiler Plant (Wikipedia)
296			1907	Waukesha	WI	Waukesha Gas & Electric Wisconsin Natural Gas	1963
297			1907	West Bend	WI	West Bend Heating & Lighting Co	1938
298			1908	Britt	IA	Britt Light & Power Co,.	1953
299			1908	Jordan	MN	Jordan Electric Light & Steam Heating Co Minnesota Utilities Northern States Power (1945)	1950
300			1908	Marshall	MN	City of Marshall	1976
301			1908	McCook	NE	McCook Electric Co.	1920
302			1908	Sidney	NE	Sidney Electric Service Company City of Sidney Western Public Service Co Consumers Public Power City of Sidney	1950
303			1908	Windber	PA	Windber Heating Co	1962
304			1908	Sturgeon Bay	WI	City of Sturgeon Bay	1935
305			1908	Evanston	WY	Evanston Electric Light Company	1922
306	59		1909	Crawfordsville	IN	Crawfordsville Heating Company	1933	Hot water
307			1909	Evansville	IN	Evansville Public Service Southern Indiana Gas & Electric	1967
308			1909	Louisville	KY	Pike Campbell Fetter Lighting & Heating Company Louisville Gas & Electric	1955
309		26	1909	Virginia	MN	Virginia Electric Power and Water Company City of Virginia (1913)		Residential service discontinued in 2020. Virginia Public Utilities
310			1909	Dickinson	ND	Hughes & Deiters Electric Co	1952
311			1909	Arlington	NE	Arlington Steam Heating Company	1925
312			1909	Aurora	NE	Aurora Electric Company Consumers Public Power District	1947
313			1909	Geneva	NE	Geneva Electric Company Continental Gas & Electric Co	1922
314			1909	Osceola	NE	Osceola & Shelby Electric Light, Heat & Power	1920
315			1909	Burlington	WI	Burlington Heating Company	1936
		27	1910	San Francisco	CA	United Light & Power Co. of San Francisco (exhaust steam) Pacific Gas & Electric (high pressure steam) Thermal Ventures (1993) NRG Thermal (1999)		Now owned by Cordia
316			1910	Streator	IL	Streator Heat and Power Co Public Service Company of Northern Illinois	1929	Exhaust steam installed by W. H. Schott
317			1910	Anderson (2)	IN	City of Anderson	1971
318	60		1910	Logansport	IN	Logansport Heat & Power Co Logansport Utilities (1920)	1922	Hot water Exhaust steam
319			1910	Alexandria	MN	City of Alexandria	1979
320			1910	Benson	MN	City of Benson	1977
321			1910	Faribault	MN	Shaft-Pierce Shoe Company	1925
322			1910	Glenwood	MN	Glenwood Electric Light, Heat & Power Northern States Power Company (1926)	1950
323			1910	Litchfield	MN	City of Litchfield	1978
324			1910	Mapleton	MN	Mapleton Electric Light Co	1920
325			1910	Springfield	MN	City of Springfield	2001
326			1910	Clay Center	NE	M. M. Johnson Electric Light Plant	1920
327			1910	Sidney	NE	Sidney Electric Service Co City of Sidney	1950
328			1910	Eugene	OR	Eugene Heating Company Eugene Water & Electric Board (1962)	2012
329	61		1910	Portland (1)	OR	Portland Central Heating Company	1920	Hot water
330			1910	Vandergrift	PA	Vandergrift Land & Improvement Co.	1925
331			1910	Bellville	TX	City of Bellville Intermountain Railway Light & Power	1920
332			1910	Yakima	WA	Yakima Central Heating Co Pacific Power & Light	1969
333			1910	Lake Mills	WI	City of Lake Mills	1950
334			1911	Oakland	CA	Central Oakland Light and Power Company Oakland, Gas, Light & Heat Company Pacific Gas & Electric (1919)	1980
335			1911	Lamar	CO	Lamar Electric & Heating Co Intermountain Railway Light & Power	1922	Exhaust steam
336			1911	Sabetha	KS	City of Sabetha	1965
337		28	1911	Hibbing	MN	City of Hibbing		Hibbing Public Utilities
338			1911	Keewatin	MN	City of Keewatin	1975
339			1911	Maryville	MO	Maryville Electric Light and Power Iowa Power & Light (1943)	1952
340			1911	Mexico	MO	Mexico Power Co Missouri Power & Lighting	1941
341			1911	Tarkio	MO	Tarkio Electric & Water Intermountain Railway Light & Power (1917)	1925	Exhaust steam
342			1911	Laramie	WY	Laramie Heating Company Western Public Service Company	1940
343			1912	Aledo	IL	Illinois Northern Utilities Co	1926	Exhaust steam
344			1912	Winthrop	MN	City of Winthrop	1965	Exhaust steam
345			1912	Excelsior Springs	MO	Excelsior Springs, Water, Gas & Electric Missouri Power & Lighting	1942
346			1912	Langdon	ND	Langdon Electric Plant Otter Tail Power Company (1926)	1930
347			1912	Hanover	PA	Central Heating Company	1968
348			1913	Danbury	CT	Danbury & Bethel Gas & Electric Co	1918
349		29	1913	Cambridge	MA	Boston Elevated Railway Company Cambridge Electric Company (1930) NStar Veolia (2005) Vicinity Energy (2019)		Owned by Vicinity Energy
350			1913	Eveleth	MN	Home Lighting & Heating Minnesota Utilities (1917) Minnesota Power & Light (1923)	1965
351			1913	Wadena	MN	City of Wadena	1973
352	E1		1913	Willmar	MN	City of Willmar	2020	Converted to hot water in 1982
353			1913	Forsythe	MT	Forsyth Light & Power Co. Mountain States Power Company	1939
354			1913	Havre	MT	Montana Power Company	1919
355			1913	Miles City	MT	City of Miles City Montana-Dakota Utilities Company	1961
356			1913	Fremont	NE	City of Fremont	1975
357			1913	Scottsbluff	NE	Scottsbluff Electric Power Company Intemountain Railway, Light & Power Consumers Public Power	1955
358			1913	Port Jefferson	NY	Port Jefferson Electric Light Co	1916
359			1913	State College	PA	Poe Steam Company State Centre Electric Co (1913)	1918
360			1914	Garrett	IN	City of Garrett	1954
361			1914	Marlborough	MA	Marlborough Electric Co.	1930
362			1914	Worcester	MA	Worcester Electric Light Co, Worcester Cold Storage & Warehouse Co.	1985
363			1914	Battle Creek	MI	Consumers Power Company	1970
364			1914	Saginaw	MI	Saginaw Steam Company Consumers Power Company	1970
365			1914	Madison	MN	City of Madison	1978
366			1914	Crawford	NE	Intermountain Railway Light & Power Co Western Public Service Co	1930
367			1914	Redfield	SC	City of Redfield Northwestern Power Company	1970
368			1914	Portland (2)	OR	Northwestern Electric Company Pacific Power & Light Co	1986
369			1914	Casper	WY	Natrona Power Company Pacific Power & Light Company	1955
370			1915	Steamboat Springs	CO	Steamboat Heating Company	1920
371			1915	Columbia City	IN	City of Columbia	1956
372			1915	Athol	MA	Athol Gas & Electric	1929
373			1915	Canby	MN	Union Public Service Company	1932
374			1915	Lapeer	MI	Peoples Light & Power Co Detroit Edison	1947
375			1915	Worthington	MN	City of Worthington	1982
376			1915	Chadron	NE	Intermountain Railway Light & Power Co Western Public Service Co.	1937
377			1915	O'Neill	NE	McGinnis Creamery & Produce Co.	1925
378			1915	Norwich	NY	Norwich Gas & Electric Co	1916
379		30	1915	Pittsburgh (2)	PA	Allegheny County Steam Heating Company Pittsburgh Allegheny County Thermal (1982)		Pittsburgh Allegheny County Thermal
380			1915	Hartford	WI	City of Hartford	1925
381			1915	Waterloo	WI	City of Waterloo	1992
382			1916	Rock Rapids	IA	City of Rock Rapids	1966
383			1916	Sibley	IA	City of Sibley	1984
384			1916	South Bend	IN	St. Joseph Heating Company	1972
385			1916	Buhl	MN	City of Buhl	1976
386		31	1916	New Ulm	MN	New Ulm Heating Company City of New Ulm		City of New Ulm District Energy
387			1916	Redwood Falls	MN	Redwood Falls Light & Power City of Redwood Falls (1946)	1976
388			1916	Sleepy Eye	MN	City of Sleepy Eye	2004
389			1916	Enderlin	ND	Otter Tail Power Company	1924
390			1916	LaMoure	ND	Dakota Utilities	1924
391			1916	Mandan	ND	United Public Utilities Co.	1953
392			1916	Oakes	ND	Otter Tail Power Company	1925
393			1916	Devils Lake	ND	General Utilities Corporation Otter Tail Power Company (1924) City of Devils Lake (1975) Devils Lake Steam Heat Authority	1986
394			1916	Spokane	WA	Merchants Central Heating Company Washington Water Power (1919)	1986	Old plant now a restaurant.
395			1917	Spencer (2)	IA	Spencer Heating Company City of Spencer (1942)	1987
396			1917	Ogallala	NE	City of Ogallala	1941
397			1918	Goshen	IN	Municipal Heating Plant	1932
398			1919	Windom	MN	City of Windom	1968
399			1919	Valley City	ND	City of Valley City	1975
400			1919	Klamath Falls (1)	OR	Klamath Heating Co Consumers Heating Co (1946)	1970
401			1919	Hudson	WI	Willow River Power Company	1963	Exhaust steam
402			1920	Flagstaff	AZ	Flagstaff Electric Company	1966	Exhaust steam
403			1920	San Diego	CA	San Diego Gas & Electric	1993
404			1920	Fairmont	MN	Fairmont Public Heating Company City of Fairmont (1939)	2007
405			1920	Luverne	MN	City of Luverne	1972
406			1920	Arcade	NY	Village of Arcade	1979	Exhaust steam until 1951
407			1921	Miller	SD	City of Miller	1950
408			1921	Watertown	SD	Watertown Central Heating Co City of Watertown (1934)	1991
409			1922	Batavia	IL	City of Batavia	1930
410			1924	Wellsville	NY	Village of Wellsville	1961
411			1925	Mariemont	OH	The Mariemont Company	1954
412			1926	Blue Earth	MN	City of Blue Earth	2005
413			1926	Austin	MN	Austin Heating Company City of Austin	1985
414		32	1927	Minneapolis	MN	Baker Properties IDS Properties (1969) The Energy Center (1972) IDS & Minnegasco NRG Thermal (1993)		Owned by Clearway Thermal
415		33	1927	Akron	OH	Akron Steam Heating Company Ohio Edison (1930) City of Akron (1979)		Operated by Akron Energy Systems
416			1927	Kalamazoo	MI	Consumers Power Company	1972
417		34	1927	Rochester (1)	MN	Franklin Heating Station
418			1927	Bala Cynwyd	PA	Bala Steam Heat Company Wynnefield Steam Heat Company (1941)	1948
419			1927	Drexel Park	PA	Aronimink Park Heating Co	1948
420			1927	Springfield Township	PA	Springfield Steam Company	1936
421			1927	Wynnefield	PA	Wynnefield Steam Heat Company	1948
422			1928	Rochester (2)	MN	City of Rochester	1986
423			1928	Yeadon	PA	Longacre Park Heating Company	1972
424			1929	Springfield (2)	MA	Springfield Gas Light Company	1963
425			1929	Hamilton	MT	Valley Mercantile Corporation	1934
426			1929	Lower Merion Township	PA	Lewis Jones Inc Pennsylvania Utilities Investment Corp (1954) General Waterworks Corp (1966)	1972
427			1930	Huron	SD	Central Heating Company	1965
428	E9	35	1932	Duluth (2)	MN	Duluth Steam Corporation Duluth Steam Cooperative (1978)		Being converted to hot water Operated by Duluth Energy Systems
429		36	1932	Cleveland (2)	OH	Medical Center Company		Medical Center Company
430			1933	Taunton	MA	City of Taunton	1970
431			1935	Mountain Iron	MN	City of Mountain Iron	1980
432			1936	New Prague	MN	City of New Prague	1979
433			1937	Holyoke	MA	City of Holyoke	2010
434			1937	Escanaba	MI	City of Escanaba	1966
435			1937	Bluffton	OH	Village of Bluffton	1945
436			1938	Concord	NH	Concord Steam Corporation	2017
437			1939	Jackson	MN	City of Jackson	1975
438			1939	Grand Island	NE	City of Grand Island	1980
439	E3		1943	Piqua (2)	OH	City of Piqua	2006	Converted to hot water in 1983
440			1945	Livingston	MT	Miles Land and Investment Company	1960
441		37	1945	Manitowoc	WI	City of Manitowoc		Manitowoc Public Utilities
442			1946	Olympia	WA	Olympia Steam Heating Company	1963
443			1948	Jamestown (1)	NY	City of Jamestown	1969
444			1949	Kalispell	MT	Central Heating Company	1959
445			1951	Chicago	IL	Medical Center Steam Company	1981	Transferred to UI Medical Center after contract expiration.
446			1955	Rice Lake	WI	Rice Lake Steam Corporation	1989
447		38	1962	Hartford (2)	CT	Hartford Steam Company		Hartford Steam Company
448	H3		1964	Nassau Bay	TX	Houston Natural Gas Thermal Systems (1978)	1990
449		39	1965	Washington (Watergate)	DC	Washington Gas Light Vicinity Energy (2020)		Owned by Vicinity Energy
450	H4	40	1966	Los Angeles Century City	CA	Central Plants, Inc Sampra Energy Trigen (2006) Veolia Enwave (2017) CenTrio (2021)		CenTrio
451	H5	41	1966	Los Angeles Bunker Hill	CA	Central Plants, Inc Sampra Energy Trigen (2006) Veolia Enwave (2017) CenTrio (2021)		CenTrio
452		42	1966	Pittsburgh (3)	PA	Equitable Gas-Energy Company Thermal Ventures (1993) NRG Pittsburgh (1999) Clearway Thermal (2019)		Owned by Clearway Thermal
453		43	1967	Gates	NY	Eastman Kodak Company RochesterTechnology Park Utility Co. (2002)		Rochester Technology Park
454		44	1968	Tucson	AZ	City of Tucson		Owned (mostly) by City of Tucson Operated by Clearway Thermal
455		45	1969	Houston (1)	TX	Houston Natural Gas Thermal Energy Corporation (1978)		Texas Medical Center Thermal Energy Corporation
456		46	1970	Oklahoma City	OK	Thermal Systems, Inc. (Oklahoma Natural Gas) Trigen (1989) Veolia (2015)		Owned by Vicinity Energy
457		47	1970	Tulsa	OK	Thermal Systems, Inc. (Oklahoma Natural Gas) Trigen (1989) Veolia (2015)		Owned by Vicinity Energy
458	H6	48	1972	Hempstead	NY	Nassau County Trigen (1989) Nassau Energy Corporation
459		49	1974	Nashville	TN	Nashville Thermal Transfer City of Nashville (2003)		Metro Nashville District Energy System
460	G2	50	1981	Philip	SD	Philip Geothermal Corporation		Geothermal hot water
461	G3	51	1982	Susanville	CA	City of Susanville		Geothermal hot water
462	G4	52	1982	Pagosa Springs	CO	City of Pagosa Springs		Geothermal hot water City Geothermal Division
463	G5	53	1982	Elko	NV	Elko Heat Company		Geothermal hot water
464	G6	54	1983	Boise (2)	ID	Boise Geothermal City of Boise Geothermal (1988)		City of Boise Geothermal
465			1983	Aitkin	MN	Aitkin Iron Works \| ASHCON	2010
466	H7	55	1983	Trenton	NJ	Cogeneration Development Corporation Trigen		Owned by Vicinity Energy
467	G7	56	1983	Saint Paul (2)	MN	Energy Park Utility Company		Energy Park Utility Company
468	G8	57	1984	San Bernadino	CA	City of San Bernadino		Geothermal hot water Geothermal System
469	E4	58	1984	Jamestown (2)	NY	City of Jamestown		Jamestown Board of Public Utilities
470	E5		1986	Provo	UT	City of Provo	1990
471		59	1987	Rochester (3)	MN	Olmsted County District Energy System		Olmsted County Waste to Energy Facility
472	E6	60	1987	Buffalo (2)	NY	City of Buffalo
473	E7	61	1988	Hartford (3)	CT	Energy Networks, Inc. State of Connecticut (2008)		Capitol Area System District Heating and Cooling Loop
474		62	1989	Lincoln (2)	NE	District Energy Corporation		District Energy Corporation
475	G9	63	1991	Klamath Falls (2)	OR	City of Klamath Falls		Geothermal hot water City of Klamath Falls Geothermal
476		64	1996	Atlantic City (2)	NJ	Atlantic Thermal Systems Pepco (2002) ACM Energy Partners, LLC (2016)		Midtown Thermal Control Center
477		65	1999	Houston (2)	TX	Union Station District Energy Plant Northwind Enwave CenTrio (2021)		CenTrio
478	G10	66	2013	West Union	IA	City of West Union \| West Union District Energy		Geothermal hot water with heat pumps in each building
479		67	2014	New Orleans	LA	New Orleans District Energy		CenTrio
480	E8	68	2014	Montpelier	VT	City of Montpelier \| State of Vermont		Hot water Montpelier District Heat