CHEYENNE, Wyo. (AP) — The owner of an eastern Wyoming oil well that blew out, causing 50 people to flee their homes, has not been fined in the year since the accident.

The Wyoming Oil and Gas Conservation Commission concluded that human error played a role in the drilling accident last April 24 but also that Chesapeake Energy didn't violate any commission rules. Wyoming interim Oil and Gas Supervisor Bob King says Chesapeake will not be fined.

The blowout released an estimated 2 million cubic feet of explosive natural gas and up to 31,500 gallons of oil-based drilling mud. A team of specialists plugged the spewing gas three days after the blowout began.

Jill Morrison with the Powder River Basin Resource Council calls it "disconcerting" Chesapeake faces no penalties for the blowout and pollution.