20 April 2015.  Utah's oldest coal-fired power plant is no longer in operation. Rocky Mountain Power shut down its 60-year-old Carbon Power Plant near Helper on Wednesday, a day before stricter federal mercury-pollution rules took effect.

BRADENTON HERALD

http://www.bradenton.com/2015/04/19/5754779/utahs-oldest

At industryabout.com: Carbon Coal Power Plant (Shutdown)

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