Washington Gas Light Co. filed its plan for the next phase of the utility's 22-year natural gas infrastructure replacement program and to recover program-related costs.

The WGL Holdings Inc. company filed a five-year plan at the Maryland Public Service Commission that would continue progress in its Strategic Infrastructure Development and Enhancement, or STRIDE, initiative in Maryland, under which Washington Gas replaces aging pipelines in its natural gas system, according to a June 15 news release. Washington Gas proposed to replace 120 miles of pipeline and 14,400 services in the state from 2019 to 2023.

STRIDE also allows Washington Gas to recover costs as it makes investments, which speeds up the infrastructure replacement work, the utility said. Washington Gas expects to invest about $393 million under the plan.

If the plan is approved, residential heating customers would begin paying a surcharge of 37 cents per month starting in 2019.

The Maryland General Assembly enacted STRIDE into law in 2013, after which Washington Gas proposed its first plan. That plan is in its final year. Washington Gas replaced 66 miles of pipeline and 15,000 services in Maryland under the plan as of March.

Washington Gas serves over 1.1 million customers in Maryland; Virginia; and Washington, D.C.