MOUNT SAINT MARY'S
OperatingSolar power plant
- Capacity
- 14 MW
- Primary fuel
- Solar
- County
- Frederick County
- Operator
- CONSTELLATION SOLAR HORIZONS LLC
- Status
- Operating
- Commissioned
- 2012
- EIA plant ID
- 57758
- Coordinates
- 39.6750, -77.3450
MOUNT SAINT MARY'S, a 14 MW Solar power plant in Frederick County, Maryland. Operated by CONSTELLATION SOLAR HORIZONS LLC, commissioned 2012.
Weather peril exposure
MOUNT SAINT MARY'S is a 14 MW solar power plant in Frederick County, MD, operated by CONSTELLATION SOLAR HORIZONS LLC, commissioned in 2012. Frederick County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.2 of 5 at the 30th national percentile. Hurricane is the leading peril, rated Relatively Low by FEMA at the 65th percentile.
Frederick County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Share of modeled loss | Events per year |
|---|---|---|---|---|---|
| Hurricane | Relatively Low | 65th | 3.6 of 5 | 8% | 0.09 |
| Lightning | Relatively High | 51st | 3.0 of 5 | 1% | 37.3 |
| Earthquake | Relatively Low | 47th | 2.9 of 5 | <1% | <0.01 |
| Hail | Relatively Moderate | 45th | 2.8 of 5 | 80% | 3.8 |
| Winter weather | Relatively High | 34th | 2.4 of 5 | <1% | 14.3 |
| Tornado | Relatively Moderate | 27th | 2.1 of 5 | 4% | 0.45 |
| Strong wind | Relatively Moderate | 21st | 1.8 of 5 | 1% | 7.7 |
| Wildfire | Very Low | 20th | 1.8 of 5 | <1% | <0.01 |
| Ice storm | Relatively Low | 14th | 1.6 of 5 | <1% | 1.0 |
| Riverine flooding | Relatively Moderate | 8th | 1.3 of 5 | 5% | 4.7 |
| Heat wave | Relatively Moderate | 0th | 1.0 of 5 | <1% | 4.2 |
Perils not assessed in Frederick 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.
| Peril | Why it is not scored |
|---|---|
| Coastal flooding | FEMA rating is "Not Applicable" for this county |
Hail exposure and deductible structure
Hail scores 2.8 of 5, which sits in the 2% to 5% percentage deductible range carriers are quoting for that exposure. Named windstorm and severe convective wind score 3.6 of 5, indicating a 2% to 5% wind deductible. Ranges, not single figures. The final structure is set by the carrier.
Percentage hail deductible range: 2% to 5% of insured value. Wind deductible range: 2% to 5%. These are the structures commonly seen at this exposure, not an offer and not a rate.
Modeled annual loss for a 14 MW solar array
At an assumed replacement value of $0.90 per watt, or $12.3M insured, the modeled expected annual loss for a fixed tilt ground mount array in Frederick County is $5,622 a year, $410 per MW, 0.05% of insured value.
Heat is modeled as a production risk rather than a property loss: 0.0% of annual yield in this county.
Insurability signal: Standard. Named windstorm and severe wind at 3.6 of 5.
Model hail, wind and flood exposure for Frederick 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, and the modeled loss applies the Bywatts solar vulnerability layer. 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. The solar vulnerability layer that turns FEMA building loss into modeled solar loss was derived by Bywatts and revised on physical reasoning. It has not been reviewed by a practising underwriter.