NStar, the Boston utility, plans in two weeks to begin building a $106 million electric transmission line to improve the reliability of the power supply in Southeastern Massachusetts and on Cape Cod.

The project will stretch 26 miles from Carver to West Barnstable and is expected to be finished next summer. The company is providing online updates on the project at www.nstartransmission.com.

“This is a major electricity reliability project for the southeastern part of our state,” Werner Schweiger, president of NStar Electric, said in a statement Wednesday.

The line’s construction is a result of recommendations made in a study by grid operator ISO New England. As part of the project, NStar will build new transmission towers and install a 345,000-volt line spanning the width of the Cape Cod Canal, as well as 18 miles of high-voltage electric lines. The work is expected to result in 100 construction and utility trade jobs.

NStar serves more than 1 million electric customers in 81 of the state’s communities.