The developers of a controversial proposed 180-mile long transmission project through New Hampshire are delaying the announcement of a new route until they do more outreach with the public and local officials.

The Northern Pass project, which would bring hydro­electric power from ­Quebec to Southern New England, has sparked wide outcry from residents and environmentalists, many of whom say its transmission towers will destroy an unbroken landscape of rolling hills, forest, and farms in northern New Hampshire.