CMP Ratepayers United, which has demanded that the state conduct a more thorough investigation into customers’ complaints of inflated CMP bills, also has been invited to join the lawsuit, said Sumner Lipman, the founding partner of Lipman and Katz.
CMP Ratepayers United has more than 4,800 members.
About 97,000 Central Maine Power customers‘ monthly bills increased 50 percent or more in December, January or February over the same month a year earlier, according to information the company provided to the Public Utilities Commission in April. The law firms contend that another 200,000 customers have been overcharged by up to 50 percent.
“As a result of our investigation, it is estimated that over 97,000 customers of Central Maine Power Company have been overcharged 50% or more on their utility bills, and another 200,000 customers have been overcharged up to 50%,” Lipman wrote in the announcement.