CONCORD, N.H. — New Hampshire’s congressional delegation is calling for an open and transparent process before a final decision is made about a proposed natural gas pipeline route in the state.

Texas-based Kinder Morgan wants to construct about 70 miles of pipeline through southern New Hampshire. About 90 percent of the project would be along an existing power line corridor.

In letters to Kinder Morgan and the Federal Energy Regulatory Commission, Sens. Jeanne Shaheen and Kelly Ayotte and Reps. Frank Guinta and Annie Kuster requested that New Hampshire residents have ample opportunity to express their views.

The letter, dated Wednesday, notes Kinder Morgan filed its latest proposal Dec. 8, which shifts much of the pipeline out of northern Massachusetts into a number of southern New Hampshire towns.

The towns include Winchester, Richmond, Troy; Fitzwilliam, Rindge, New Ipswich, Greenville, Mason, Milford, Brookline, Amherst, Merrimack, Litchfield, Londonderry, Hudson, Windham, Pelham and Salem.

The delegation requests “that Kinder Morgan provide the public, municipal officials in potentially affected municipalities, and our offices with additional information on the timeline for the current pre-filing phase.”

It also urges the company “to extend that timeline to ensure that New Hampshire’s residents have a full and equal opportunity to understand, assess, and comment on this project before any decisions are made finalizing the project or its route.”