The couple alleges that companies and others, including maintenance technicians named in the suit, didn't properly maintain the transmission pipeline that ruptured.
NiSource said in a statement Friday that it had settled lawsuits with and provided compensation to more than 40 families impacted by the explosion. It also said the company took immediate action after the blast and ensured things like housing and food were provided for those affected.
"As we have since the moment this incident occurred, we are committed to working with those families in a fair and reasonable manner," the company said in the statement.
The case has been assigned to Kanawha Circuit Judge Charles King.
Last month, six of seven other separate lawsuits filed in Kanawha County over the blast were settled for undisclosed amounts.
Only a lawsuit filed by Sissonville resident Margaret Johnson remains. Mediation in that case has been unsuccessful, her attorney, Bobby Warner, previously said.
Johnson's lawsuit says she was sitting in her home at 7345 Sissonville Dr. when the explosion occurred.
"Feeling the heat from the flames and seeing the flames around her home soon after the loud boom of the explosion, [Johnson] ran from her home barefoot and in her pajamas fearing that she would be killed if she remained in the home," that suit states.
The heat from the blast blistered Johnson's feet and she injured her hand trying to escape in her car, her suit alleges.
Reach Kate White at kate.wh...@wvgazette.com or 304-348-1723.