A crew works in 2015 to replace a gas line in Portage Park. [Heather Cherone/DNAinfo Chicago]

Although it has been a relatively mild winter in Illinois and natural gas prices are low, residents gas bills haven’t budged — due in part to the cost of ongoing efforts to replace decades-old natural gas pipes.

A years-long dispute over the pipe replacement project between consumer groups and the utility companies heated up this week with the introduction of two bills.

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