ROBERT MOSES POWER DAM

Operating

Hydro power plant

Capacity
912 MW
Primary fuel
Hydro
County
St. Lawrence County
Operator
NEW YORK POWER AUTHORITY
Status
Operating
Commissioned
1958
EIA plant ID
2694
Generators
16
Technology
Conventional Hydroelectric
Net generation (2024)
7,369 GWh
Capacity factor (2024, EIA nameplate)
92%
Data vintage
EIA-860 2024 final; EIA-923 2022-2024 final
Coordinates
45.0039, -74.7995

See it on the map

ROBERT MOSES POWER DAM, a 912 MW Hydro power plant in St. Lawrence County, New York. Operated by NEW YORK POWER AUTHORITY, commissioned 1958.

How ROBERT MOSES POWER DAM compares

With 912 MW of capacity, ROBERT MOSES POWER DAM ranks 12th among the 320 operating power plants Bywatts maps in New York and 3rd of the 153 operating Hydro plants in the state. It accounts for about 16% of New York's operating Hydro capacity and 2.4% of all operating capacity in the state. Nationally it is the 24th-largest of the 1,243 operating Hydro plants in the database. Commissioned in 1958, it is older than 67% of the 312 operating New York plants with a recorded commissioning year. Its operator, NEW YORK POWER AUTHORITY, runs 19 operating plants in New York totaling 5,870 MW. It shares St. Lawrence County with 37 other operating plants, including MASSENA ENERGY FACILITY and COLTON.

EIA-860 lists 16 generators at the site with 912 MW of nameplate capacity, all conventional hydroelectric technology. Net generation was 7,369 GWh in 2024 (a 92% capacity factor), up 1% from 2022. Its generators came online between 1958 and 1959.

Grid neighborhood

The nearest named substation is MOSES (230 kV), about 0.2 miles away; the closest transmission line found within 10 miles is a 230 kV line owned by NIAGARA MOHAWK POWER CORP., under 0.1 miles away. Another 10 operating power plants totaling 132 MW sit within 25 miles; the largest is MASSENA ENERGY FACILITY (104 MW, Natural Gas).

Computed by Bywatts from HIFLD power plant, substation and transmission line records and EIA-860/923 survey data; distances are straight-line. Sources and methodology

Weather peril exposure

ROBERT MOSES POWER DAM is a 912 MW hydro power plant in St. Lawrence County, NY, operated by NEW YORK POWER AUTHORITY, commissioned in 1958. St. Lawrence County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.0 of 5 at the 1st national percentile. Earthquake is the leading peril, rated Relatively Low by FEMA at the 79th percentile.

The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a hydro plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.

1.0 of 5Modeled catastrophe exposure
LowExposure band
EarthquakeLeading peril
Relatively LowFEMA county risk rating

St. Lawrence County hazard ratings

PerilFEMA ratingNational percentilePeril scoreEvents per year
EarthquakeRelatively Low79th4.2 of 5<0.01
Ice stormRelatively High76th4.0 of 50.66
Riverine floodingRelatively Moderate62nd3.5 of 50.96
Winter weatherRelatively High53rd3.1 of 519.7
HurricaneRelatively Low43rd2.7 of 5<0.01
LightningRelatively Moderate34th2.4 of 523.7
Strong windRelatively Low26th2.1 of 50.54
TornadoVery Low8th1.3 of 50.10
WildfireVery Low6th1.2 of 5<0.01
Heat waveVery Low4th1.2 of 51.3
HailVery Low2nd1.1 of 50.34

Perils not assessed in St. Lawrence County

These perils carry no usable National Risk Index figure for this county, so they are excluded from the scoring rather than scored zero. A zero would claim the peril was assessed and found benign.

PerilWhy it is not scored
Coastal floodingFEMA rating is "Not Applicable" for this county

Model hail, wind and flood exposure for St. Lawrence County in the weather risk calculator

Ratings are the FEMA National Risk Index county hazard ratings; the peril score is a Bywatts transform of the FEMA national percentile. Full data sources and the solar vulnerability methodology are in the weather risk calculator.

Modeled estimate for screening and negotiation. Built from FEMA National Risk Index county hazard data and a solar vulnerability layer documented above. Not a quote, a binder, or actuarial advice, and not a substitute for a carrier's own model. Hazard data: FEMA National Risk Index December 2025, synced 2026-07-24. Resolution is county level, not site level.