Hydro Projects in the Maine Interconnection Queue

Snapshot of 2026-09-07 · 27 projects

27 hydro projects are in the interconnection queue with a Maine location, totaling 1,085 MW across the 26 that publish a capacity.

Grouped from the ISOs' own fuel codes (see the mapping). Codes we could not match to a published definition are left unclassified rather than assigned here.

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By ISO

ISO	Projects	Capacity
ISO-NE	27	1,085 MW (from 26 of 27 projects)

By status, as published

Status	Projects
(not published)	27

Top counties

County	Projects	Capacity
Penobscot	9	9 MW (from 8 of 9 projects)
Somerset	7	8 MW
Androscoggin	3	6 MW
Oxford	2	1 MW
York	2	2 MW
Wiscasset	1	1,000 MW
Lewiston	1	1 MW
Oxford/Franklin/Androscoggin	1	28 MW
Androscoggin/Franklin	1	28 MW

Largest projects with published capacity

The 12 highest-capacity rows in this page's exact scope, ordered by the capacity the ISO published. Projects without a published capacity are not ranked here and remain included in the totals above.

Project	ISO	County	MW	Status	Queue date	Proposed operation
Pumped Storage Project ID 270	ISO-NE	Wiscasset	1,000	not published	7/17/2008	6/1/2014
Hydro ID 597	ISO-NE	Oxford/Franklin/Androscoggin	28	not published	2/24/2016	6/1/2019
Riley-Jay-Otis-Livermore ID 951	ISO-NE	Androscoggin/Franklin	28	not published	2/3/2020	11/1/2024
Gulf Island Unit 2 Increase ID 351	ISO-NE	Androscoggin	4	not published	12/3/2010	4/26/2011
Wyman Hydro Uprate U3 ID 366#3d7b50ab	ISO-NE	Somerset	4	not published	5/23/2011	3/30/2016
Hydro ID 358#14c84828	ISO-NE	Penobscot	4	not published	3/4/2011	8/15/2012
Milford Hydro Expansion ID 358	ISO-NE	Penobscot	2	not published	3/4/2011	11/4/2011
Wyman Hydro Uprate U1 ID 366	ISO-NE	Somerset	2	not published	5/23/2011	3/30/2016
Hydro ID 358#5d7d9014	ISO-NE	Penobscot	2	not published	3/4/2011	8/15/2012
Weston Station Uprate U4 ID 391	ISO-NE	Somerset	2	not published	2/2/2012	7/31/2015
Rumford Falls Unit #3 increase ID 321	ISO-NE	Oxford	1	not published	12/24/2009	6/1/2010
Skelton Station Modernization Phase 1 ID 372	ISO-NE	York	1	not published	8/3/2011	12/28/2013

Where each number came from

ISO	We last read	Source last changed	Source
ISO-NE	2026-09-07	2026-09-07 (changed this snapshot)	source file

This week's changes · How this is collected

Compiled from each ISO's own published interconnection queue report. Queue position is not a permit, a contract, or a guarantee that a project will be built; most projects in every queue are eventually withdrawn. Figures are reproduced as published, are provided for informational purposes only, and carry no warranty of accuracy or completeness. Always verify against the ISO's own report before relying on any figure.