PORTLAND, Maine (WMTW) - A new document filed with the Maine Public Utilities Commission indicates 97,000 Central Maine Power accounts saw year-over-year month or average daily usage increases of more than 50 percent.
Over the winter, hundreds of CMP customers complained about large spikes in their bills. Some customers reported their bills doubling or tripling.
In a letter filed Tuesday in response to a request for information from the PUC, CMP's senior counsel said the company has determined 140,000 bills and 97,000 customers fit into criteria the PUC is asking for.
Specifically, the PUC has asked CMP for bills from December 2017 to February 2018 for monthly and average daily usage for "customers whose bills in that month indicate a year-to-year monthly or average daily use increase of 50 percent or more."
The PUC has asked for copies of all the bills and CMP's conclusion to the cause.
A 32-page document also given to the PUC indicates CMP knew about certain billing errors as early as November 2017.
The PUC has asked asked CMP for data regarding temperatures during the same period.
Last week, CMP said it had not found any problems to explain why hundreds of customers reported higher-than-average bills this past winter.
The company is standing by the new smart meter technology it installed last fall.
CMP said October's windstorm that knocked out power to hundreds of thousands of people and a cold winter resulted in increased usage.