TC Energy said it detected a natural gas leak at the Saunders Creek Regulator Station in West Virginia around 8:35 a.m. ET and "immediately activated emergency response procedures."

The company said it reduced the pressure of natural gas to isolate the station, and notified customers of delivery impacts. The situation was confined to the Saunders Creek station, TC Energy added.

The outage sent natural gas futures higher, with the October contract on the New York Mercantile Exchange settling up 9.1% at $3.297 per million British thermal units, a three-month high.

Natural gas futures have been gradually rising as a warmer-than-usual September kept up power-sector demand through the tail end of summer, limiting inventory builds. The U.S. Energy Information Administration reported a 53 billion cubic foot injection into storage for last week, a sixth consecutive below-average build that reduced the surplus over the five-year average to 95 Bcf from 118 Bcf the previous week.