Internal documents now show that central Maine power has been aware of the problems with their billing system for months.

According to the Portland Press Herald, the company has had the billing problems since it switched from its 27-year-old mainframe system on October 30, 2017, which was the same day high winds knocked power out to over 400,000 customers.

More than 250 pages of internal records were filed with the Maine Public Utilities Commission, including documents showing efforts by CMP and Avengrid, their parent company, to track down the problems. Some of the problems included customers who were enrolled in auto-pay being de-enrolled, estimated bills that were higher than usual, bills reporting double usage of power with zero cost, and customers of the simple-pay program being dropped for non-payment of a minimal amount.

Company officials previously said the new system was not the cause of the unusually high bills, which affected approximately 1500 customers. However, since November, hundreds of complaints have been filed against them.