Mechanicville Hydroelectric Plant
Why it's listed
Mechanicville Hydroelectric Plant sits on the Hudson River south of Mechanicville, New York. Built in 1897-98 by the Hudson River Power Transmission Company, it combines a brick, gable-roofed powerhouse with an earth embankment, a concrete non-overflow dam and a long concrete overflow dam running to the eastern bank. Inside, seven General Electric generators, original to the 1897-99 installation, are driven by turbines that were replaced in 1902 with larger units by S. Morgan Smith. The plant was designed to send alternating current to customers including the General Electric works at Schenectady, at a time when long-distance transmission was a new technology. It has operated continuously since construction and is described as the oldest extant hydroelectric plant in the state. The nomination values it for industrial development, engineering and architecture, noting that the building and equipment remain remarkably close to their original appearance. Later additions include a 1901 boiler house and 1950s frequency converters.
Significance in brief: The nomination argues the plant is the oldest extant hydroelectric plant in New York State in continuous use since 1897. It is an outstanding example of large-scale industrial architecture of the early hydroelectric industry and an intact example of sophisticated generation engineering. Its powerhouse, dam and machinery are among the earliest remaining in the nation.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 89001942, listed November 13, 1989. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | At NY 32 on Hudson River, Mechanicville |
|---|---|
| County | Rensselaer County |
| Listed | November 13, 1989 |
| Reference number | 89001942 |
| Resource type | District |
| Period of significance | 1897, 1902 |
| Architect / builder | A.C. Rice, Engineer/Architect; Stillwell-Bierce and Smith-Vaile, Builder |
| Architectural style | Industrial, Queen Anne |
| Criteria |
|
| Areas of significance | Industry, Engineering, Architecture |
| Level of significance | State |
| Status (as stated in the nomination) | Still operating as a hydroelectric power plant; the concrete of the western abutment and waste gates on Bluff Island is severely deteriorated (1989). |
| Acreage | 18.3 |
| Within district | New York State Barge Canal |
| Coordinates | 42.87808, -73.67930 (NPS GIS) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 89001942.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q14706930
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.