Ukraine has scored a series of successes since Russia invaded on Feb. 24, forcing Moscow's commanders to abandon an advance on the capital Kyiv before making rapid gains to drive them from Kharkiv, Ukraine's second-biggest city.
"Both stations were shut down due to damage to the main gas pipeline in the Kharkiv region as a result of hostilities," the operator said in a statement, adding that the damages have now been repaired.
Some 54 gas distribution stations in seven regions of Ukraine remain shut down, the operator added.