Wyoming

Proposed Seminoe pumped storage project draws criticisms at Wednesday public meeting

Published

2 months ago

May 28, 2026

Proposed Seminoe pumped storage project draws criticisms at Wednesday public meeting

CASPER, Wyo. — A proposed pumped storage hydroelectric facility at Seminoe Reservoir drew strong criticism Wednesday at a public meeting in Casper that featured dozens of community members, conservationists and elected officials. The event was hosted by a number of organizations, including Friends of the North Platte, Trout Unlimited, the Wyoming Wildlife Federation and the Wyoming Wild Sheep Foundation.

In an April presentation to the Natrona County Board of County Commissioners, representatives from rPlus Hydro — the company behind the proposed project — said the facility would generate 970 megawatts of power. The planned system would pump water from Seminoe Reservoir to a new 120-acre upper reservoir during periods of surplus energy, releasing it back down through turbines when demand peaks to provide up to 12 hours of full-output energy storage. The project requires the construction of an access bridge, an underground powerhouse, a main access tunnel and a 29-mile transmission line to the Aeolus substation.

However, community members at the meeting voiced a wide range of concerns about possible drawbacks to the project.

Trout Unlimited representative Jim Hissong said the project could have serious impacts on the fish populations of Miracle Mile, a 5.5-mile tailwater stretch of the North Platte River located about 50 miles southwest of Casper, where the project is planned to be built.

Hissong said the impact on fish and insects will be twofold. First, he said the facility is expected to raise water temperatures, which would endanger the fish.

“Trout, when it’s about 68–70 degrees — when you hook them, the stress on the fish will be so great that it’ll kill them,” he said. “That’s why Game and Fish puts on the restrictions where once it hits a certain temperature, you pick up your rods and go home.”

Hissong added that the expected increase of sediment in the water could kill insects like mayflies and stoneflies, as well as suffocate trout eggs.

However, the project could impact more than just the aquatic species in the area, Wyoming Wild Sheep Foundation Executive Director Katie Cheesbrough said. According to Cheesbrough, the area’s bighorn sheep population — which she said is the biggest in the state and critical for the species’ health in the region — could also be harmed.

“For those of you who don’t know, you have a very special bighorn sheep herd above and around the Miracle Mile,” she told attendees at the meeting. “It’s a huge success for bighorn sheep conservation. This is a reintroduced herd and it went from 13 sheep maybe in 2003 to close to 400 sheep now. That effort came with a lot of partnerships, funding and work. Currently, it’s the healthiest bighorn sheep herd in the state. … This is the only bighorn sheep herd that we can use to reintroduce sheep to their native range in other parts of Wyoming or other parts of the country.”

But it wouldn’t be the impacts to the water that would pose the largest threat to the sheep. Instead, Cheesbrough said, the sheep would likely be driven away by blasting that is expected to take place over several years as the project gets underway.

When the sheep are driven out, Cheesbrough said they will migrate east to the Pedro Mountains in Carbon County, though they are not allowed to live there and will be subsequently removed. From there, she said, the animals will likely die.

“Removal is killing,” she said.

With impacts to the animals and environment expected, Trout Unlimited Wyoming Government Relations Director Patrick Harrington said impacts to outdoor recreation and tourism would follow. Citing a draft environmental impact study, Harrington said the area is projected to see roughly 117,000 lost recreation visits during the five-year construction period. Once completed, he said, the disturbance to the water, wildlife and landscape would likely continue to affect recreational visits.

“I think we’ll see a decline in the fishery, first initially in construction, when we may see large fish kills from large plumes of sediment going downstream. But over time, through consistent operation, we’ll see what was once a world-class fishery decline into just an average fishery,” Harrington said.

Sen. Larry Hicks, who represents Wyoming’s 11th district, said that the electricity generated by the project likely won’t be used by Wyomingites.

“This is going to go out of state, folks. We don’t need this electricity in Wyoming,” Hicks said, adding that 75% of the energy consumed in Wyoming is generated by oil and coal. “Let’s just make that clear: We’re a net exporter right now.”

“It isn’t going to be the people in Las Vegas or southern California or Phoenix that suffer the impact — it’s you and your family. Sometimes you just have to know what’s not for sale,” Hicks added, drawing applause from attendees.

On Thursday, the Travel, Recreation, Wildlife & Cultural Resources Committee of the Wyoming Legislature will meet at 8:35 a.m. at the Thyra Thomson State Office Building, 444 W. Collins Drive, to discuss the project.

Harrington urged those in attendance to attend the Thursday morning meeting, and said he was encouraged by the turnout at Wednesday’s event.

“This is a community that cares about their river and their wildlife, and it was awesome to see so many turn out to support it,” he said.

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Wyoming

Bison tosses man into the air in Yellowstone national park – video

Published

10 hours ago

July 14, 2026

Press Room

Bison tosses man into the air in Yellowstone national park – video

Carl McDaniel, 65, from Washington state suffered broken bones after he was charged by a 2,000lb (900kg) bull during a visit to Yellowstone with his grandson on Friday. The encounter was recorded by Mike MacLeod, a professional photographer, who said the animal was ‘agitated, pissed off and charging anything and everything’

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Wyoming

July 13 recap: Wyoming news you may have missed today

Published

22 hours ago

July 14, 2026

Press Room

July 13 recap: Wyoming news you may have missed today

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Wyoming

Wyoming authorities call on Rocky Mountain Power to explain role in massive November power outage

Published

1 day ago

July 13, 2026

Press Room

Wyoming authorities call on Rocky Mountain Power to explain role in massive November power outage

by Dustin Bleizeffer, WyoFile

The massive, multiple-utility power outage last fall that left some 250,000 customers across parts of Wyoming, South Dakota and Montana without electricity was the result of miscommunication and inadequate procedures during planned maintenance that required de-energizing a power line in southcentral Wyoming, according to a report.

The Nov. 13 incident left thousands of homes and businesses without power for 9.5 hours — longer, in some cases — and knocked out a coal-powered generator outside Glenrock. The unit at the Dave Johnston Power Plant remains offline, leaving Rocky Mountain Power to backfill some 300 megawatts of electricity — enough to power about 225,000 homes.

The Dave Johnston coal-fired power plant, pictured on the afternoon of Nov. 13, 2025. (Dustin Bleizeffer/WyoFile)

Without expressly assigning blame to any one party, the report — conducted by the Western Electricity Coordinating Council and the North American Electric Reliability Corporation — indicates a series of communication breakdowns between PacifiCorp (parent company of Rocky Mountain Power), the Western Area Power Administration and, to some degree, electrical grid coordinating teams.

While it’s unclear whether authorities such as the North American Electric Reliability Corporation might pinpoint fault and assess penalties, the Wyoming Public Service Commission has called on Rocky Mountain Power to appear at a hearing scheduled for 2:30 p.m. Wednesday. The commission wants to hear from the utility about “the specifics and details of the event and report,” a public notice announced, and it “may consider and take any action that is in the public interest.”

The hearing at the Public Service Commission’s office located at 2515 Warren Avenue, Suite 300, in Cheyenne, will also be livestreamed at this link.

What happened

According to the 49-page report published in June, PacifiCorp and the Western Area Power Administration were coordinating maintenance on their respective systems that, together, required temporarily de-energizing PacifiCorp’s Aeolus–Clover 500 kilovolt line, which runs east-west and is anchored, in part, by a substation near Medicine Bow.

The effort also required curtailing some local wind energy from feeding the grid, according to the report. But on the day of the planned maintenance, Nov. 13, there was confusion about whether the Western Area Power Administration would scrap its work, so wind energy wasn’t curtailed as originally planned.

The report indicates that modeling tools might have failed to accurately measure local grid conditions, so when the power line was de-energized, “power flow rapidly redistributed throughout the northeast portion” of the local grid. “Within six seconds,” according to the report, “an electrical island formed and collapsed, causing widespread effects across that portion of the interconnection.

“The disturbance,” the report continues, “culminated in the loss of more than 4,800 [megawatts] of generation from coal, natural gas, photovoltaic and wind resources.”

The cascading power failure began at about 12:45 p.m. on a Thursday, dragging down portions of service territories operated by Rocky Mountain Power, Black Hills Energy, Montana-Dakota Utilities and some rural electric co-ops.

The report points to failures in communication, process deficiencies and inadequate modeling tools. Wind energy was not “identified as a contributing factor,” according to the report. It credits both battery storage and wind energy throughout the impacted area for supporting “a faster frequency recovery across the interconnection” and for providing “readily available capacity during system restoration.”

This article was originally published by WyoFile and is republished here with permission. WyoFile is an independent nonprofit news organization focused on Wyoming people, places and policy.

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