BANGOR, Maine — An across-the-board electric power transmission rate increase went into effect Friday for Bangor Hydro-Electric Co. customers, according to a company press release.

A residential customer will see a 1.36 percent increase, or about $1.10 on an average monthly bill of $81. The rate changes for commercial, industrial and transmission-level customers will vary for each company, according to the press statement.

The rate change, which affects residential, commercial and industrial consumers, is the result of an annual transmission rate adjustment that normally occurs this time of year, the company said. Transmission costs are about 15 percent of the average residential and small business customer bill. They are associated with the conveyance of the electricity from power-generating plants across high-voltage lines to the company’s distribution substations.

The Federal Energy Regulatory Commission regulates transmission rates.