A board of high-ranking Maryland officials on Wednesday rejected a proposed TransCanada pipeline across the western part of the state that would carry natural gas produced in Pennsylvania to West Virginia.

The Board of Public Works voted 3-0 against an easement for Calgary-based TransCanada's pipeline. It would run under the Potomac River near Hanover, Maryland, and extend 4.8 kilometres from the Columbia Gas network in Pennsylvania to Mountaineer Gas distribution system in West Virginia.

Comptroller Peter Franchot, a Democrat, cited testimony that the pipeline could bring Maryland environmental problems without economic benefits. The board also includes Maryland Gov. Larry Hogan, a Republican, and Treasurer Nancy Kopp, a Democrat.

Maryland banned fracking

Environmentalists and residents have been vocal in opposing the pipeline.

"Marylanders and many of their leaders have consistently opposed the threats fracked gas pipelines pose to our health, water, climate, and communities," said Josh Tulkin, Sierra Club Maryland chapter director.

The board's vote came after more than 60 lawmakers sent a letter urging board members to reject the proposal. The lawmakers noted that Maryland approved a law, which Hogan signed in 2017, to ban the hydraulic fracturing drilling process known as fracking in Maryland. The process is used to extract natural gas. Maryland was the first state where a legislature voted to bar the practice that actually has natural gas reserves.

"Given that Maryland has banned fracking, it defies our state's existing energy policy to bring the same public health risks to our residents by way of a pipeline," the letter said. "Moreover, enabling fossil fuel production runs counter to our state's goals of increasing renewable energy production."

Concern over streams, wetlands

The letter, which was sent this week, also noted that the pipeline would affect at least 10 wetlands and 19 streams, in addition to the Potomac River.

While the board delayed a vote on the easement at its last meeting, Hogan said the unanimous vote would have happened without the letter from lawmakers.

"It had nothing to do with any letter from the legislature," Hogan said at Wednesday's board meeting.

Anne Havemann, an attorney for Chesapeake Climate Action Network, said she hopes the board's vote marks an end to the proposal.

"We'll see if [the Federal Energy Regulatory Commission] gets involved or the courts get involved, but for now it's a welcome delay and we hope a permanent end to this pipeline," Havemann said shortly after the vote.