File photo of high-voltage power lines are pictured in the western town of Nierderaussem November 9, 2011. (REUTERS/Ina Fassbender /file)

You think your hydro bill is confusing? A Connecticut woman got a cheque for more than $10,000 from the power company after she realized they'd been overcharging her for 25 years.

Grace Edwards, of Cheshire, paid about $20 a month extra on her electricity bill to illuminate "9500 Lumen HP Sodium" and "6300 Lumen HP Sodium" — two streetlights down the road from her house — the Hartford Courant reports.

"(The charges had) no more relevance to me than any other line items on the bill," she told the paper.

But when she recently requested her billing history for a prospective home buyer, she discovered Connecticut Light & Power's statements showed lower charges than what she'd paid.

CL&P agreed to remove the streetlights from future bills but wouldn't reimburse her. She took her case first to the state Public Utilities Regulatory Authority — who were "rude," she told the Courant — then to the state consumer protection agency.

A quarter century after she moved in to the house, Edwards got a cheque from CL&P for the approximately $5,800 she'd overpaid plus interest, totalling $10,491.21. She also received an apology.