West Virginia's Allegheny Highlands have some of the darkest skies in the eastern United States. A proposed gas-powered data center between Davis and Thomas, at the head of Canaan Valley, would put an industrial light source in the middle of them. How far would the glow reach?
Astronomers rate night skies from Class 1 (pristine) to Class 9 (inner city). Most Americans live under Class 7 to 9 skies. The West Virginia highlands are one of the last Class 2 refuges between Chicago and the Atlantic.
Class ranges follow commonly used sky quality meter (SQM) conversions (mag/arcsec²). They are approximate.
Pick a lighting scenario, then tap a place on the map or in the table to see its sky. The model uses Walker's Law, the standard astronomy rule of thumb that skyglow fades with distance to the 2.5 power.
Schematic map plotted from approximate coordinates. Rings mark 5, 15, 30 and 50 miles from the site.
| Place | Miles | Bortle today → projected |
|---|
"Added glow" is artificial light added on top of the natural sky, measured 45° up and facing the site. Near the horizon it is several times stronger.
This zone takes the direct hit. Under typical industrial lighting, Blackwater Falls could drop from roughly Class 3 to suburban-level skies. Canaan Valley's wildlife refuge could lose about a full Bortle class, and Dolly Sods' horizon picks up a visible dome. These are the places that sell Tucker County's night-sky tourism.
At the zenith, one facility adds only a few percent to the sky brightness, so Spruce Knob stays Class 2. Looking north toward Tucker County, though, a full unshielded build-out could leave a faint glow low on the horizon. That matters to astrophotographers shooting wide fields and to the Spruce Knob Mountain Center's observing programs.
At this distance the optical impact is negligible: Green Bank, Cass, Watoga and Calvin Price stay Class 2. Green Bank also has a radio concern, since data centers are dense sources of electrical noise. This site sits well outside the state's 10-mile Radio Astronomy Zoning Act zone, but it is still inside the National Radio Quiet Zone.
The bigger risk is precedent. West Virginia's 2025 "microgrid" law (HB 2014) lets data centers with their own power plants be built with limited local say. One plant 31 miles from Spruce Knob barely registers. Several plants built closer, in Pendleton, Randolph or Pocahontas counties, would. Skyglow from multiple sources adds up, and nothing in state law protects these skies today.
Walker's Law assumes a clear, dry sky. The Highlands are rarely that.
Canaan Valley is one of the cloudiest, foggiest places in the East. In rural areas, overcast skies reflect artificial light back down and can make the ground-level glow many times brighter than on a clear night.
Cooling and exhaust plumes rising over floodlit grounds act like glowing columns. They scatter light upward and can be seen for miles on a still night.
Tall exhaust stacks may need aircraft-warning lights. Anything sited on high ground at the head of the valley is visible from much of the valley and from surrounding ridges.
Fundamental Data buys the 291-acre tract from Western Pocahontas Properties.
The legislature passes HB 2014, the "microgrid" law, over objections from local residents and conservation groups.
WV DEP approves the air-quality permit. Turbine counts and emissions detail are redacted.
DEP confirms the company had legal site control when the permit was approved.
The state appeals court dismisses environmental groups' lawsuits over the plant.
Fully shielded, downward fixtures at 3000K or warmer, motion-activated security lighting, and a published lumen cap for the site.
Measure sky brightness now at Blackwater Falls, Canaan Valley NWR, Dolly Sods and Spruce Knob, so any change can be documented.
Extend dark-sky safeguards to the Monongahela highlands, building on the three existing International Dark Sky Parks.
Coordinate with Green Bank Observatory on electrical noise from any large facility inside the Quiet Zone.
added glow = 0.01 × P × d−2.5, where P is the equivalent population of a lit town and d is the distance in km. The result is the fraction added to natural sky brightness, 45° up, facing the source. The law is most reliable at about 10–50 km, so treat numbers inside 5 miles as order-of-magnitude.This is an illustrative planning model, not a measurement. Its purpose is to show where on-the-ground monitoring matters most.