A story that seems hard to believe claims a California man just discovered he's been paying the wrong power bill for up to 18 years.

A man from California got the shock of his life when he discovered that he had been shouldering the electicity expenses of someone else for almost 20 years. In a report by CBS affiliate KOLD-TV, Ken Wilson recounted how he started to get suspicious of his electicity bill when he noticed that he was being charged higher than usual in recent months.

A Bay Area man recently discovered he had inadvertently been paying his neighbor’s electricity bill for nearly two decades, which Pacific Gas and Electric Co. termed an “oversight.” Ken Wilson, a resident of the same Vacaville apartment since 2006,