Wyoming's $4B pumped-storage project divides energy savings and environmental risks
A controversial $4 billion pumped-water storage project near Seminoe Reservoir has sparked debate over its environmental and economic impacts. Critics warn the facility could harm the Miracle Mile trout fishery and disrupt local wildlife, while supporters claim it will cut electricity costs by millions each year.
The Federal Energy Regulatory Commission (FERC) is overseeing the permitting process, with stakeholders raising concerns about long-term consequences for the North Platte River and surrounding ecosystems.
The proposed project involves constructing a 13,400-acre-foot reservoir in the Bennett Mountains above Seminoe Reservoir. Water would be pumped uphill when electricity demand is low, then released to generate hydroelectric power during peak times. However, opponents argue that the system would result in a net energy loss rather than the grid enhancement promised by developers.
Wildlife officials have warned that five years of blasting and heavy industrial traffic could threaten the Ferris-Seminoe bighorn sheep herd. This herd plays a key role in supporting bighorn populations across Wyoming. Meanwhile, anglers and conservationists fear warmer water releases from the project could damage the Miracle Mile’s trout fishery, a prized stretch of the North Platte River. Casper Mayor Ray Pacheco testified that the river is vital to the city’s drinking water, wastewater treatment, and tourism economy. He stressed that any disruption could harm local businesses and residents. In contrast, rPlus Hydro’s Deputy General Counsel Kevin Baker claimed the project would save ratepayers $200 million annually by stabilising electricity prices. Environmental groups and local leaders have urged FERC to carefully weigh the risks before approving the plan. The agency’s decision will determine whether the project moves forward or faces further delays.
The outcome of the permitting process will shape the future of the North Platte River’s ecosystem and Casper’s water supply. If approved, the facility could alter water temperatures, disrupt wildlife, and reshape energy costs for the region. FERC’s final ruling will decide whether the economic benefits outweigh the environmental concerns raised by opponents.
