North Carolina’s Republican-majority lawmakers on Tuesday overturned Gov. Roy Cooper’s (D) veto of House Bill 600, which would streamline water quality requirements for the extension of the Mountain Valley Pipeline (MVP).

The move gives a boost to MVP’s extension plans, known as the MVP Southgate Project. North Carolina regulators denied a water quality permit for the project in the past, citing the unfinished status of the MVP mainline.

“House Bill 600 is a good-faith effort to help reduce the regulatory burden on North Carolinians and their businesses,” Rep. Jeff Zenger (R-Forsyth), the bill’s sponsor, was quoted as saying.

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Earlier this year, MVP...