Unitil Corp. has filed for a rate increase for its natural gas customers in Maine, the company announced Wednesday.

Unitil also provides natural gas to customers in New Hampshire and Massachusetts, but the rate increase would apply only to Maine customers.

If the rates are approved, a typical residential gas heating customer would see a monthly increase of $8.66 or about 9 percent. Charges to individual customers will depend on their rate class and usage.

The rate increase is proposed to take effect July 17, but could be delayed by the Maine Public Utilities Commission. Unitil serves about 104,300 electric customers and 79,900 natural gas customers.

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