Cos Cob Power Station
A selected, source-based research collection for New Haven and Fairfield counties. Includes credited photographs where reusable images were located, historical interpretation and links to supporting records. It is a growing inventory, not an exhaustive survey. Photographs retain their individual dates and reuse terms; images do not establish present access conditions.

id: CT070-S01
title: Cos Cob Power Station: history and source bibliography
kind: Sources & research leads
date: Source reviewed September 2026
institution: Cos Cob Power Station
summary: Supporting source for the collection’s history, chronology and research notes. Engineering photographs preserve a lost power station central to railroad electrification.
url: https://en.wikipedia.org/wiki/Cos_Cob_Power_Station
credit: Cos Cob Power Station
notes: External source; the full publication remains with its publisher. The archive provides an original educational summary and a link. See the collection history for the claims supported by this record.
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id: CT070-S02
title: ASME: New Haven Railroad electrification landmark
kind: Sources & research leads
date: Source reviewed September 2026
institution: Cos Cob Power Station
summary: Supporting source for the collection’s history, chronology and research notes. Engineering photographs preserve a lost power station central to railroad electrification.
url: https://www.asme.org/about-asme/engineering-history/landmarks/76-ac-electrification-new-york-new-haven-hartford
credit: ASME
notes: External source; the full publication remains with its publisher. The archive provides an original educational summary and a link. See the collection history for the claims supported by this record.
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id: CT070-P01
title: Cos Cob Power Plant, Cos Cob, (Fairfield County, Connecticut)
kind: Photographs
date: 1977-04
institution: Cos Cob Power Station
summary: Aerial view of Cos Cob Power Plant, April 1977.
url: https://commons.wikimedia.org/wiki/File:Cos_Cob_Power_Plant,_Cos_Cob,_(Fairfield_County,_Connecticut).jpg
credit: Jack Boucher / Public domain
notes: Public domain in the United States (source file license). Image supplied at web resolution; no editorial changes to the source image.
file: images/cos_cob-11082423.jpg
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accessed: 2026-09-12
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external_image_url: https://upload.wikimedia.org/wikipedia/commons/1/19/Cos_Cob_Power_Plant%2C_Cos_Cob%2C_%28Fairfield_County%2C_Connecticut%29.jpg
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id: CT070-P02
title: View looking northwest from turbine hall roof at two 600,000 gallon reservoirs for boiler feed water.
kind: Photographs
date: 1993
institution: Cos Cob Power Station
summary: Two boiler feed-water reservoirs at Cos Cob Power Plant, viewed from the turbine hall roof, 1993.
url: https://commons.wikimedia.org/wiki/File:VIEW_LOOKING_NORTHWEST_FROM_TURBINE_HALL_ROOF_AT_TWO_600,000_GALLON_RESERVOIRS_FOR_BOILER_FEED_WATER._-_New_York,_New_Haven_and_Hartford_Railroad,_Cos_Cob_Power_Plant,_Sound_HAER_CONN,1-GREWI,15A-9.tif
credit: Jet Lowe / Historic American Engineering Record / Public domain
notes: Public domain U.S. National Park Service photograph (PD-USGov-NPS). LOC: No known restrictions on images made by the U.S. Government. Image supplied at web resolution; no editorial changes to the source image. Original repository record: https://www.loc.gov/pictures/item/ct0568.photos.383634p
file: images/cos_cob-33841945.jpg
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accessed: 2026-09-12
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external_image_url: https://upload.wikimedia.org/wikipedia/commons/4/40/VIEW_LOOKING_NORTHWEST_FROM_TURBINE_HALL_ROOF_AT_TWO_600%2C000_GALLON_RESERVOIRS_FOR_BOILER_FEED_WATER._-_New_York%2C_New_Haven_and_Hartford_Railroad%2C_Cos_Cob_Power_Plant%2C_Sound_HAER_CONN%2C1-GREWI%2C15A-9.tif
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id: CT070-P03
title: VIEW OF REMAINS OF ORIGINAL 1907 CONTROL PANEL, LOCATED ON NORTH WALL OF EAST END OF CONTROL ROOM. PORTIONS OF THIS PANEL REMAINED IN USE UNTIL THE PLANT CLOSED. THE METERS HAER CONN,1-GREWI,15A-52
kind: Photographs
date: 1993
institution: Cos Cob Power Station
summary: Remains of the original 1907 control panel at Cos Cob Power Plant, photographed in 1993.
url: https://commons.wikimedia.org/wiki/File:VIEW_OF_REMAINS_OF_ORIGINAL_1907_CONTROL_PANEL,_LOCATED_ON_NORTH_WALL_OF_EAST_END_OF_CONTROL_ROOM._PORTIONS_OF_THIS_PANEL_REMAINED_IN_USE_UNTIL_THE_PLANT_CLOSED._THE_METERS_HAER_CONN,1-GREWI,15A-52.tif
credit: Jet Lowe / Historic American Engineering Record / Public domain
notes: Public domain U.S. National Park Service photograph (PD-USGov-NPS). LOC: No known restrictions on images made by the U.S. Government. Image supplied at web resolution; no editorial changes to the source image. Original repository record: https://www.loc.gov/pictures/item/ct0568.photos.383677p
file: images/cos_cob-33842353.jpg
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accessed: 2026-09-12
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external_image_url: https://upload.wikimedia.org/wikipedia/commons/2/21/VIEW_OF_REMAINS_OF_ORIGINAL_1907_CONTROL_PANEL%2C_LOCATED_ON_NORTH_WALL_OF_EAST_END_OF_CONTROL_ROOM._PORTIONS_OF_THIS_PANEL_REMAINED_IN_USE_UNTIL_THE_PLANT_CLOSED._THE_METERS_HAER_CONN%2C1-GREWI%2C15A-52.tif
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id: ED-H2-HT-SP-023
title: Turbogenerator hall looking west-northwest
kind: Photographs
date: 1993
institution: Cos Cob Power Station
summary: Turbogenerators inside the former Cos Cob power station. Units 1–3 in the foreground and frequency converters behind them show how electric power generation occupied the turbine hall.
url: https://www.loc.gov/pictures/item/ct0568.photos.383667p/
credit: Jet Lowe / Library of Congress
notes: HAER CONN,1-GREWI,15A--42. Catalog identifies photographer/date; direct URL not inferred when unobserved. Weathered machinery matches; film identifier CT-142-A-63 visible. Display copy optimized for the web with proportional resizing and compression. The linked repository identifies the original image. Reuse: LOC HAER: no known restrictions; US government documentation.
file: images/ED-H2-HT-SP-023.webp
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accessed: 2026-09-12
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external_image_url: https://cdn.loc.gov/service/pnp/habshaer/ct/ct0500/ct0568/photos/383667pv.jpg
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id: ED-H2-HT-SP-024
title: Westinghouse Parsons turbine No. 2
kind: Photographs
date: 1993
institution: Cos Cob Power Station
summary: Turbine No. 2, installed in 1925, appears in the station's 1993 engineering survey.
url: https://www.loc.gov/pictures/item/ct0568.photos.383665p/
credit: Jet Lowe / Library of Congress
notes: Available at the linked repository; image or full record is not included in this download. HAER CONN,1-GREWI,15A--40. Catalog identifies photographer/date; direct URL not inferred when unobserved. Reuse: LOC HAER: no known restrictions; US government documentation.
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id: ED-H2-HT-SP-025
title: LeBlanc jet condenser under turbine No. 3
kind: Photographs
date: 1993
institution: Cos Cob Power Station
summary: The condenser below turbine No. 3 records the equipment supporting steam turbine operation.
url: https://www.loc.gov/pictures/item/ct0568.photos.383669p/
credit: Jet Lowe / Library of Congress
notes: Available at the linked repository; image or full record is not included in this download. HAER CONN,1-GREWI,15A--44. Catalog identifies photographer/date; direct URL not inferred when unobserved. Reuse: LOC HAER: no known restrictions; US government documentation.
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id: ED-H2-HT-SP-026
title: Exciter generator C below the control room
kind: Photographs
date: 1993
institution: Cos Cob Power Station
summary: The exciter supplied direct current to the field coils, connecting the control room to the generators.
url: https://www.loc.gov/pictures/item/ct0568.photos.383674p/
credit: Jet Lowe / Library of Congress
notes: Available at the linked repository; image or full record is not included in this download. HAER CONN,1-GREWI,15A--49. Catalog identifies photographer/date; direct URL not inferred when unobserved. Reuse: LOC HAER: no known restrictions; US government documentation.
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