This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
The polaric warp conduit was a successor to the plasma warp conduit.
In 3189, Commander Jett Reno came close to fully replacing the plasma conduits with the polaric conduits aboard the USS Discovery when she noticed that the power in her backup cells had been drained. She traced the cause to Lieutenant Commander Paul Stamets' team, who had eminent allocation clearances from Captain Saru for powering the long-range sensors so they could hack into the KSF Khi'eth. (DIS: "Terra Firma, Part 2")