Hydro completed queue projects in the USA

Before a new power plant or battery can connect to the US grid, it joins a queue for studies and an interconnection agreement. Most requests never get built. This shows every request: active, built and withdrawn.

Requests shown2273,422 MW

Active in queue2,273 MW47 requests

Agreement signed402 MW22 requests

Withdrawn22415.9 GW never built

Find requests

Project, developer, substation or county State Grid region Technology Status Year joined Sort

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Source: Lawrence Berkeley National Laboratory, Queued Up interconnection queue data (data through end of 2025). Map points are county centres, not exact sites.

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In studyAgreement signedUnder constructionBuiltSuspendedWithdrawn

Requests

227 requests · page 1 of 5

Project	Capacity	Status	Location	Region	Queued	Online
Bath County Hydro	340 MW	Operating	Bath, VA	PJM	Oct 2005	2009
Hydro project 757, Baker County Hydro · Idaho Power Company - Power Supply	220 MW	Operating	Baker, OR	West	Mar 2025
Muddy Run Hydro	160 MW	Operating	York, PA	PJM	Nov 1999	2003
Holtwood Hydro	140 MW	Operating	Lancaster, PA	PJM	Mar 2006	2010
Hydro project 1, Berkeley County Hydro · SCPSA	128 MW	Operating	Berkeley, SC	Southeast	Apr 2001	target 2005
Millinocket Frequency Conversion Hydro	126 MW	Operating	Penobscot, ME	ISO-NE	Feb 2015	target 2019
Great Northern - Millinocket Hydro	126 MW	Operating	Penobscot, ME	ISO-NE	Dec 2001	target 2003
Hydro project 795, Power County Hydro · Idaho Power Company - Power Supply	118 MW	Operating	Power, ID	West	Jul 2025
Meldahl Hydroelectric Plant Hydro	112 MW	Operating	Butler, OH	PJM	Sep 2009	2015
Holtwood Hydro	107 MW	Operating	Lancaster, PA	PJM	Jul 2001	2002
Hydro project 237, Ada County Hydro	100 MW	Operating	Ada, ID	West	Oct 2007	target 2008
Hydro project G032, Hancock County Hydro	95.0 MW	Operating	Hancock, KY	MISO	Mar 2000	2001
Hydro project 10, Skagit County Hydro	85.0 MW	Operating	Skagit, WA	West	Jun 2007	target 2007
Hydro project G849, Perry County Hydro	84.0 MW	Operating	Perry, IN	MISO	Sep 2007	2016
Hydro project G848, Livingston County Hydro	80.0 MW	Operating	Livingston, KY	MISO	Sep 2007	2007
Boundary Powerhouse Hydro	70.0 MW	Operating	Pend Oreille, WA	West	Feb 2015	target 2016
Hydro project 136, Twin Falls County Hydro	64.0 MW	Operating	Twin Falls, ID	West	Jun 2005	2017
Hydro project J329, Marion County Hydro	55.0 MW	Operating	Marion, IA	MISO	Apr 2014	2019
Hawks Nest Hydro Hydro	54.2 MW	Operating	Fayette, WV	PJM	Jan 2007	2009
Hydro project 26, Sanders County Hydro	42.0 MW	Operating	Sanders, MT	West	Aug 2009	target 2012
Smith Creek Hydro	39.0 MW	Operating	Boundary, ID	West	Jul 2015	target 1987
Willow Island Hydro Generation Project Hydro	36.4 MW	Operating	Wetzel, WV	PJM	Jul 2007	2015
Conowingo Hydro	36.0 MW	Operating	Harford, MD	PJM	Nov 1999	2003
Smith Mountain Hydro Hydro	34.0 MW	Operating	Henry, VA	PJM	Feb 2015	2018
Vernon Repowering Hydro	32.0 MW	Operating	Windham, VT	ISO-NE	Jul 2006	target 2008
Hydro project 35, Skagit County Hydro	30.4 MW	Operating	Skagit, WA	West	Sep 2011	target 2013
Hydro project 35 (PSE Merchant) Hydro	30.4 MW	Operating		West	Sep 2011	target 2013
Hydro project 35 (PSE_x000D_ Merchant) Hydro	30.0 MW	Operating		West		target 2013
Riley-Jay-Otis-Livermore Hydro	28.3 MW	Operating	Androscoggin, ME	ISO-NE	Feb 2020	target 2023
Hydro project 17108 Hydro · Duke Energy Carolinas LLC	27.0 MW	Operating		Southeast	Nov 2012	2013
John H. Kerr Dam Hydro Units 1(15MW), 2-7(42MW) Hydro	27.0 MW	Operating	Mecklenburg, VA	PJM	Sep 2005	2011
GLHA James River/Fraser Paper7 Hydro	25.0 MW	Operating	Coos, NH	ISO-NE	Jul 2003	target 2004
Hydro project 68, Klamath County Hydro · PacifiCorp Commercial & Trading	25.0 MW	Operating	Klamath, OR	West	Dec 2005	target 2007
Conowingo Hydro Station Hydro	24.0 MW	Operating	Harford, MD	PJM	Jan 2007	2010
Hydro project 49, Cascade County Hydro	23.0 MW	Operating	Cascade, MT	West	Jun 2006	2011
Hydro project 402, Lewis And Clark County Hydro	21.6 MW	Operating	Lewis And Clark, MT	West	Jan 2021	2021
Yards Creek Pumped Storage Hydro-electric Generating Station Hydro	20.0 MW	Operating	Warren, NJ	PJM	Aug 2013	2014
Hydro project 256, Ada County Hydro	18.0 MW	Operating	Ada, ID	West	Jun 2008	2010
Seneca Pumped Storage Generating Station Hydro	17.0 MW	Operating	Warren, PA	PJM	Oct 2013	2017
Hydro project GEN-2008-005, Mayes County Hydro	16.0 MW	Operating	Mayes, OK	SPP	Jan 2008	2009
Seneca Pumped Storage Generating Station Unit 1 Hydro	16.0 MW	Operating	Warren, PA	PJM	Jul 2006	2010
Seneca Pumped Generating Station Unit 2 Hydro	16.0 MW	Operating	Warren, PA	PJM	Feb 2007	2010
Hydro project G547, Miller County Hydro	15.0 MW	Operating	Miller, MO	MISO	Sep 2005	2005
Weston Station AVR Replacement U2-4 Hydro	14.8 MW	Operating	Somerset, ME	ISO-NE	Feb 2012	target 2015
Hydro project J145, Miller County Hydro	14.0 MW	Operating	Miller, MO	MISO	Jun 2010	2004
Hydro project 177, Lake County Hydro	14.0 MW	Operating	Lake, MT	West	Jan 2015	2015
Hydro project 39, Benton County Hydro · Southern California Public Power Authority	13.6 MW	Operating	Benton, WA	West	Mar 2004	target 2006
Reusens Hydro Electric Generating Plant Hydro	12.5 MW	Operating	City Of Lynchburg, VA	PJM	Apr 2016	2017
Hydro project 301, Cascade County Hydro	12.0 MW	Operating	Cascade, MT	West	Sep 2016	2017
Hydro project 62, Teton County Hydro	11.5 MW	Operating	Teton, MT	West	May 2007	2009

Capacity in the queue by state

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By grid region

ISO/RTO markets and the non-ISO West and Southeast.

Requests by year joined

Capacity of requests in this view, by the year they entered the queue. Click a year.

20102025

Source: Rand, J. et al., Queued Up, Lawrence Berkeley National Laboratory, data through end of 2025. Compiled from the queues of the 7 ISO/RTOs and dozens of non-ISO utilities. A request is a proposal to connect, not a commitment to build: historically most are withdrawn. Capacity is the requested interconnection size; hybrids include the storage component. Transmission lines · Planned power plants (EIA)