Midcontinent Independent System Operator, Inc.

Balancing Authority Summary Information

Midcontinent Independent System Operator, Inc. is ranked #2 out of 64 balancing authorities in terms of total annual electricity generation.

Balancing Authority	Midcontinent Independent System Operator, Inc.
States	Arkansas Illinois Indiana Iowa Kentucky Louisiana Michigan Minnesota Mississippi Missouri Montana North Dakota South Dakota Texas Wisconsin
Last Update	Oct 2026
Annual Generation	677.7 TWh
Power Plants	3,095
Utilities	1,372
Ranked #2 out of 64 in terms of net annual generation
Ranked #2 out of 53 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 37.1% Coal \| 26.2% Wind \| 15% Nuclear \| 13.8% Solar \| 6.1% Water \| 1.4% Other Fuel \| 0.5%

Map of Midcontinent Independent System Operator, Inc.

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Daily Net Generation for Midcontinent Independent System Operator, Inc. for the past 3 Years

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Plant Name	Utility	Location	Annual Generation	Plant Date	Last Update	Fuel Types
Maple Lake	Great River Energy	Maple Lake, MN	321 MWh	Apr 1978	Dec 2025	Distillate Fuel Oil
CED Peoria Solar	Bay4 Energy Services, LLC	Mapleton, IL	4 GWh	Apr 2021	Dec 2025	Solar
Schull CSG	Schull CSG LLC	Mapleton, MN	2 GWh	Oct 2021	Dec 2025	Solar
Mapleton Community Solar	Mapleton Community Solar	Mapleton, MN	5 GWh	May 2017	Dec 2025	Solar
Novel - OYA of Mapleton CSG	NRG MN Community LLC	Mapleton, MN	6 GWh	Jun 2018	Dec 2025	Solar
Iowa Hydro LLC	Zero6 Energy Hydro	Maquoketa, IA	6 GWh	Dec 1923	Jul 2026	Water
Marceline	City of Marceline - (MO)	Marceline, MO	20 MWh	Jul 1989	Dec 2025	Distillate Fuel Oil
Park Mill	Eagle Creek Renewable Energy, LLC	Marinette, WI	4 GWh	Dec 1919	Dec 2025	Water
Marion	Southern Illinois Power Coop	Marion, IL	796 GWh	May 1963	Jul 2026	Bituminous Coal : 86.3% Natural Gas : 13.1% Distillate Fuel Oil : 0.6%
SV CSG Barrass Farms II LL	SV CSG Barrass Farms II LLC	Marion, IL	5 GWh	Aug 2023	Dec 2025	Solar
Alliant SBD 8602 Marion Sub	Industrial Energy Applications Inc	Marion, IA	30 MWh	Jul 1986	Dec 2025	Distillate Fuel Oil
Prairie State Generating Station	Prairie State Generating Co LLC	Marissa, IL	12 TWh	May 2012	Jul 2026	Bituminous Coal : 99.8%
McClure Dam	Upper Peninsula Power Company	Marquette, MI	26 GWh	Jan 1988	Dec 2025	Water
James R Smith	City of Marquette - (MI)	Marquette, MI	14 GWh	Dec 1918	Dec 2025	Water
Marquette Energy Center	City of Marquette - (MI)	Marquette, MI	164 GWh	Jul 2017	Dec 2025	Natural Gas : 98.9% Distillate Fuel Oil : 1.1%
Marshall (IL)	City of Marshall - (IL)	Marshall, IL	167 MWh	Mar 2002	Dec 2025	Distillate Fuel Oil
Marshall Solar (IL)	Altorfer Inc.	Marshall, IL	1 MWh	Mar 2025	Jan 2025	Solar
Marshall (MI)	City of Marshall - (MI)	Marshall, MI	638 MWh	May 1928	Dec 2025	Water
GRS C&C	Gas Recovery Systems Inc	Marshall, MI	21 GWh	Jan 1995	Dec 2025	Landfill Gas
Marshall (MN)	City of Marshall - (MN)	Marshall, MN	93 MWh	Jun 1969	Dec 2025	Distillate Fuel Oil
Marshall Wind 1 LLC	Marshall Wind Farm, LLC	Marshall, MN	1 GWh	Nov 2007	Dec 2025	Wind
Marshall Solar Energy Project	Marshall Solar Energy Project	Marshall, MN	97 GWh	Dec 2016	Jul 2026	Solar
Marshall Wind 6 LLC	Marshall Wind Farm, LLC	Marshall, MN	3 GWh	Nov 2007	Dec 2025	Wind
Marshall Wind 5 LLC	Marshall Wind Farm, LLC	Marshall, MN	2 GWh	Nov 2007	Dec 2025	Wind
Marshall Wind 4 LLC	Marshall Wind Farm, LLC	Marshall, MN	4 GWh	Nov 2007	Dec 2025	Wind
Marshall Wind 3 LLC	Marshall Wind Farm, LLC	Marshall, MN	4 GWh	Nov 2007	Dec 2025	Wind
Marshall Wind 2 LLC	Marshall Wind Farm, LLC	Marshall, MN	5 GWh	Nov 2007	Nov 2025	Wind
Marshall Solar Plus LLC	Western Minnesota Mun Pwr Agny	Marshall, MN	17 GWh	Nov 2024	Dec 2025	Solar
Marshalltown	Interstate Power and Light Co	Marshalltown, IA	20 GWh	May 1978	Dec 2025	Natural Gas
Alliant SBD 9107 JBS USA	Industrial Energy Applications Inc	Marshalltown, IA	45 MWh	Jul 1992	Jul 2026	Distillate Fuel Oil
Marshalltown Generating Station	Interstate Power and Light Co	Marshalltown, IA	3 TWh	Mar 2017	Jul 2026	Natural Gas : 99.9%
Vienna Wind Farm	MidAmerican Energy Co	Marshalltown, IA	622 GWh	Oct 2012	Dec 2025	Wind
Marshfield Utilities Gas Plant	City of Marshfield - (WI)	Marshfield, WI	19 GWh	May 2011	Dec 2025	Natural Gas
New Madrid Solar, LLC	New Madrid Solar, LLC	Marston, MO	351 GWh	Oct 2025	Jul 2026	Solar
Eagle Valley (IN)	AES Indiana	Martinsville, IN	5 TWh	Nov 1951	Jul 2026	Natural Gas
Dakota Range Wind	Northern States Power Co - Minnesota	Marvin, SD	998 GWh	Dec 2021	Jul 2026	Wind
Salt Creek Township Solar, LLC	Birch Creek Power, LLC	Mason City, IL	117 GWh	Dec 2024	Jul 2026	Solar
Glacier Sands Wind Power, LLC	Glacier Sands Wind Power, LLC	Mason City, IL	644 GWh	Oct 2021	Jul 2026	Wind
Moraine Sands Wind Power	Moraine Sands Wind Power, LLC	Mason City, IL	574 GWh	Nov 2023	Jul 2026	Wind
CED Mason City Wind	RWE Clean Energy	Mason City, IA	29 GWh	Apr 2020	Dec 2025	Wind
REG Mason City Solar	REG Mason City, LLC	Mason City, IA	4 GWh	Nov 2024	Dec 2025	Solar
Lime Creek	Interstate Power and Light Co	Mason City, IA	1 GWh	Apr 1991	Sep 2025	Distillate Fuel Oil
Blue Elk II Solar, LLC	Blue Elk II Solar, LLC	Mason, MI	35 GWh	Apr 2024	Dec 2025	Solar
Rolling Hills Wind Farm	MidAmerican Energy Co	Massena, IA	2 TWh	Nov 2011	Jul 2026	Wind
Cooks Mill PV I	Cooks Mill PV I, LLC	Matoon, IL	94 GWh	-	Jul 2026	Solar
Lemonweir (Oak 1)	Greenbacker Renewable Energy Corporation	Mauston, WI	6 GWh	Nov 2023	Dec 2025	Solar
Elroy Solar	Green Street Power Partners	Mauston, WI	1 GWh	Aug 2019	Dec 2025	Solar
USS Dressen Family Solar LLC	United States Solar Corporation	Mayer, MN	2 GWh	Jun 2023	Dec 2025	Solar
Wolverine Solar	Wolverine Solar, LLC	Maynard, MN	2 GWh	Oct 2023	Dec 2025	Solar
Centaurus Community Solar	Centaurus Community Solar	Maynard, MN	3 GWh	Aug 2017	Dec 2025	Solar
Putnam (MI)	DTE Electric Company	Mayville, MI	129 MWh	May 1971	Dec 2025	Distillate Fuel Oil
Butler Ridge	Butler Ridge Wind Energy Center	Mayville, WI	137 GWh	Jan 2009	Jul 2026	Wind
Rochester Hydro	Rochester Public Utilities	Mazeppa, MN	22 GWh	Aug 1984	Dec 2025	Water
Novel Sunnyfield Farms Solar LLC CSG	REA Investments, LLC	Mazeppa, MN	2 GWh	May 2022	Dec 2025	Solar
Siems Solar Project CSG	Siems Community Solar LLC	Mazeppa, MN	2 GWh	Jul 2020	Dec 2025	Solar
Stoney Corners Wind Farm	DTE Sustainable Generation	McBain, MI	125 GWh	Nov 2009	Dec 2025	Wind
National Energy of McBain	National Salvage & Service Corporation	McBain, MI	129 GWh	Nov 1988	Dec 2025	Wood/Wood Waste Solids : 90.5% Tire-derived Fuels : 9.4%
McGregor	City of McGregor- (IA)	McGregor, IA	11 MWh	Nov 1941	Dec 2025	Distillate Fuel Oil
Pioneer Prairie Wind Farm	Pioneer Prairie Wind Farm I, LLC	McIntire, IA	838 GWh	Sep 2008	Jul 2026	Wind
McLeansboro	City of McLeansboro - (IL)	McLeansboro, IL	42 MWh	Nov 1950	Dec 2025	Distillate Fuel Oil
Medford DPC Solar	SoCore Energy LLC	Medford, WI	3 GWh	Jan 2017	Jul 2026	Solar
Melrose 2	Melrose Public Utilities	Melrose, MN	4 MWh	Feb 2014	Dec 2025	Distillate Fuel Oil
USS Midtown Solar LLC CSG	Standard Solar	Melrose, MN	2 GWh	Nov 2019	Dec 2025	Solar
New Munich Solar	New Munich Solar LLC	Melrose, MN	2 GWh	Aug 2019	Dec 2025	Solar
Melrose	Melrose Public Utilities	Melrose, MN	71 MWh	Jun 1945	Dec 2025	Distillate Fuel Oil
Heartland Divide Wind Project, LLC	Heartland Divide Wind Project, LLC	Melville, IA	424 GWh	Nov 2018	Jul 2026	Wind
Menominee Mill Marinette	Eagle Creek Renewable Energy, LLC	Menominee, MI	9 GWh	Dec 1923	Jul 2026	Water
Harley-Davison Powertrain Operations	Wisconsin Electric Power Co	Menomonee Falls, WI	3 GWh	Sep 2020	Dec 2025	Solar
Downsville DPC Solar	SoCore Energy LLC	Menomonee, WI	2 GWh	Jan 2017	Jul 2026	Solar
Menomonie	Northern States Power Co - Minnesota	Menomonie, WI	23 GWh	Dec 1957	Dec 2025	Water
Cedar Falls (WI)	Northern States Power Co - Minnesota	Menomonie, WI	31 GWh	Dec 1909	Dec 2025	Water
Bayou Galion Solar Project	Bayou Galion Solar Project, LLC	Mer Rouge, LA	208 GWh	Oct 2024	Jul 2026	Solar
Morgan Solar 1 CSG	Morgan Solar 1 LLC	Meredosia, IL	4 GWh	Jul 2021	Dec 2025	Solar
Morgan Solar 1b CSG	Morgan Solar 1b LLC	Meredosia, IL	3 GWh	Jul 2021	Dec 2025	Solar
Meridian Wind Park	DTE Electric Company	Merrill, MI	482 GWh	Mar 2023	Jul 2026	Wind
Merrill	Wisconsin Public Service Corp	Merrill, WI	4 GWh	Feb 1917	Dec 2025	Water
Alexander	Wisconsin Public Service Corp	Merrill, WI	14 GWh	Dec 1924	Dec 2025	Water
Strobus	Altus Power America Management, LLC	Merrillan, WI	3 GWh	Aug 2021	Dec 2025	Solar
Lincoln Solar	Ecos Energy LLC	Merrillville, IN	2 GWh	Nov 2012	Dec 2025	Solar
Hodenpyl	Consumers Energy Co - (MI)	Mesick, MI	22 GWh	Jun 1925	Dec 2025	Water
Mexico	Union Electric Co - (MO)	Mexico, MO	2 GWh	Aug 1978	Dec 2025	Distillate Fuel Oil
Envoy Solar, LLC	Birch Creek Power, LLC	Mexico, MO	110 GWh	Jan 2025	Jul 2026	Solar
Michigan City	Northern Indiana Pub Serv Co	Michigan City, IN	2 TWh	Apr 1974	Jul 2026	Subbituminous Coal : 78.0% Bituminous Coal : 20.3% Natural Gas : 1.7%
Deercroft I & II LFGTE	Wabash Valley Power Assn, Inc	Michigan City, IN	19 GWh	Jul 1999	Dec 2025	Landfill Gas
Amana Society Service Company	Amana Society Service Co	Middle Amana, IA	1 GWh	Apr 2001	Dec 2025	Distillate Fuel Oil
Middlebury Solar	Ecos Energy LLC	Middlebury, IN	2 GWh	Oct 2012	Dec 2025	Solar
Heartland Farms	Consumers Energy Co - (MI)	Middleton, MI	464 GWh	Mar 2024	Jul 2026	Wind
Middleton Biogas Solar, LLC	Middleton Biogas Solar, LLC	Middleton, WI	2 GWh	Apr 2022	Dec 2025	Solar
Middleton Airport Solar	Madison Gas & Electric Co	Middleton, WI	7 GWh	Jun 2020	Dec 2025	Solar
IMPA Middletown Solar Park	Indiana Municipal Power Agency	Middletown, IN	2 GWh	Jul 2023	Dec 2025	Solar
Midland Cogeneration Venture	Midland Cogeneration Venture	Midland, MI	10 TWh	May 1989	Jul 2026	Natural Gas
White Tail Solar	White Tail Solar, LLC	Milan, MI	163 GWh	Oct 2025	Jul 2026	Solar
Valley Queen Cheese	Valley Queen Cheese Factory, Inc.	Milbank, SD	20 MWh	Mar 2002	Apr 2026	Distillate Fuel Oil
Miles City GT	Montana-Dakota Utilities Co	Miles City, MT	2 GWh	Apr 1972	Dec 2025	Natural Gas : 99.7%
MMSD Jones Island Wastewater	Milwaukee Metro Sewerage Dist	Milwaukee, WI	83 GWh	Dec 1970	Jul 2026	Natural Gas : 87.1% Landfill Gas : 11.9% Distillate Fuel Oil : 1.0%
Valley (WI)	Wisconsin Electric Power Co	Milwaukee, WI	327 GWh	May 1968	Jul 2026	Natural Gas
City of Milwaukee Landfill	Wisconsin Electric Power Co	Milwaukee, WI	3 GWh	Jan 2021	Dec 2025	Solar
Michigan Wind 2	Michigan Wind 2, LLC	Minden City, MI	329 GWh	Nov 2011	Dec 2025	Wind
Minden Wind Park	DTE Electric Company	Minden City, MI	109 GWh	Nov 2012	Jul 2026	Wind
Univ Minnesota CHP Plant	University of Minnesota Central Utilities	Minneapolis, MN	172 GWh	Oct 2017	Dec 2025	Natural Gas : 99.7%

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	433.0 GWh	4
#26	Associated Electric Cooperative, Inc.	22.9 TWh	47
#13	Duke Energy Carolinas	113.4 TWh	578
#50	Duke Energy Progress West	4.6 TWh	15
#23	Louisville Gas and Electric Company and Kentucky Utilities Company	34.2 TWh	25
#1	PJM Interconnection, LLC	890.9 TWh	2,806
#6	Southern Company Services, Inc. - Trans	259.3 TWh	423
#5	Southwest Power Pool	314.5 TWh	876
#53	Southwestern Power Administration	3.5 TWh	37
#9	Tennessee Valley Authority	166.2 TWh	209

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#1	PJM Interconnection, LLC	890.9 TWh	2,806
#2	Midcontinent Independent System Operator, Inc.	677.7 TWh	3,095
#3	Electric Reliability Council of Texas, Inc.	506.3 TWh	1,487
#5	Southwest Power Pool	314.5 TWh	876
#6	Southern Company Services, Inc. - Trans	259.3 TWh	423
#7	California Independent System Operator	168.7 TWh	2,170
#9	Tennessee Valley Authority	166.2 TWh	209
#10	Florida Power & Light Co.	153.0 TWh	188
#12	New York Independent System Operator	134.1 TWh	1,334
#13	Duke Energy Carolinas	113.4 TWh	578