Documents show 97,000 Maine power customers saw their bills double between December 2017 and February 2018.
WMTW-TV reports Central Maine Power filed documents with the state Public Utilities Commission Tuesday that showed 140,000 bills for monthly and average daily usage in that time period saw increases of more than 50 percent.
The state launched an audit into Central Maine Power after about 1,500 customers contacted the commission about high winter power bills.
The utility previously said an October windstorm that caused blackouts and cold winter temperatures led to the usage increases. CMP says it expects the audit will determine if it provides "accurate measurements of customer usage."
The commission ruled April 4 power customers disputing their bills have to pay at least a portion of the cost.