WASHINGTON (AP) — District of Columbia Mayor Vincent Gray wants to move up to 60 major power lines underground at a cost of $1 billion to prevent extended outages in the future.

The mayor on Wednesday accepted a task force’s recommendation that the lines be moved underground. The task force was convened after a severe storm last summer that knocked out power to some Washington-area residents for a week or more.

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Customers of the city’s electric utility, Pepco, would pay for the majority of the project through higher bills. City officials say rates for residential customers would increase by $1.50 a month at first. The increase would top out at $3.25 per month by 2020.

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The plan would have to be approved by the D.C. Council and the district’s Public Service Commission.

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