LOWELL — Vermont’s largest electric utility has finished work on the last of its 21-turbine wind power project on Lowell Mountain in time to meet an end-of-year deadline to receive federal tax credits for the project.

Green Mountain Power Vice President Robert Dostis said the final turbine was hooked up to the electric grid Tuesday night.

He said testing will continue for the next couple weeks, but the project has met its end-of-the-year deadline.

Dostis told Vermont Public Radio that the $40 million tax credits will help lower the cost of power for customers.

The Lowell Mountain project was criticized by some who felt it would scar what was once a pristine ridgeline in Vermont’s Northeast Kingdom.