The agreement covers 264 GE turbines at eight different wind projects. GE said it is its first service agreement signed for a complete fleet of turbines.
In addition to on-site maintenance, GE will aim to increase production. There will also be an availability guarantee at the Utah, Maine and Hawaii projects.
Michael Alvarez, president and chief financial officer of First Wind said: "GE is focused on improving the performance of our installed base of 1.5 MW turbines. We believe this long term service agreement with GE will help us to optimise annual energy production and reduce the overall cost of electricity, both key factors for success in today's challenging wind-energy industry."