Consumers Energy is working on a summer construction programme to replace 135 miles of century-old cast-iron and steel pipelines across 15 communities in the US state of Michigan.

As part of the Natural Gas Delivery Plan, the programme will upgrade the company’s statewide natural gas system, affecting over 1.8 million customers.

More than 600 employees and contractors are engaged in the effort, ensuring the natural gas system can withstand all seasons.

Consumers Energy natural gas engineering and supply vice-president Holly Bowers stated: "These projects are a visible demonstration of Consumers Energy's commitment to delivering natural gas safely, affordably and reliably to our friends and neighbours who count on us.

"We focus on work that will have the most impact, ensuring that our natural gas system will be reliable for many more years."

The construction is spread across various regions and includes an 18-mile stretch in Livonia and Warren, and smaller projects in Bloomfield, Pontiac and Royal Oak in southeast Michigan.

Flint will see 10 miles of upgrades, with additional work in Owosso and Fowlerville. Saginaw/Bay City, Kalamazoo, Lansing and Midland are also on the list.

These projects complement the ongoing Four Cities metro pipeline replacement in southeast Michigan, part of a broader initiative that will extend throughout the decade. Local pipeline upgrades are also being conducted statewide.

The modernisation is expected to keep household costs below $3 a day. It will provide affordable natural gas and stimulate the economy through job creation in the coming years.

Bowers added: "We appreciate the patience of our customers as we carry out these upgrades in the coming months and continue to deliver natural gas reliably and affordably, regardless of what Mother Nature throws at us."