Wyoming
Six cases of measles confirmed by Wyoming Department of Health
TETON COUNTY, Wyo. — The Wyoming Department of Health recently confirmed two additional cases of measles in Teton County, bringing the statewide total to six cases, with five cases having occurred in Teton County.
A release from the WDH states that one recently-confirmed case is an adult with no identified links to the previous three Teton County cases, while the other case is also an adult, who had direct exposure to a previously identified case.
“This underscores the highly contagious nature of the measles virus,” the release states.
According to the release, the public may have been exposed to measles at the following locations and times:
Target Jackson Hole, 510 S Highway 89, Jackson, Wyoming 83001
- July 5, 2026, 7:00 AM through 7:00 PM
- July 6, 2026, 7:00 AM through 7:00 PM
- July 7, 2026, 7:00 AM through 7:00 PM
Smith’s Food and Drug, 1425 South Highway 89, Jackson, Wyoming 83001
- July 8, 2026, 9:00 AM through noon
“Measles is very contagious and can cause serious illness, including pneumonia, encephalitis, hospitalization, and death,” the release states. “Vaccination is the best way to prevent measles infection.”
For more information on measles, including case counts, exposure locations, and guidance on what to do if exposed, visit the Wyoming Department of Health website.
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Wyoming
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.
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.
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Wind turbines near Cheyenne poke into a colorful sunrise in January 2025. (Tennessee Watson/WyoFile)
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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