The Reading Municipal Light Department’s Board of Commissioners last month unanimously approved a three-year contract for Coleen O’Brien to become the department’s new general manager. She is scheduled to begin work Monday. O’Brien comes to Reading with more than 30 years of experience with utilities, most recently as the electric utility director at the Danvers Municipal Light Plant, a position she was appointed to in 1998 after serving for three years as the director of engineering and operations. A graduate of Northeastern University, O’Brien holds a bachelor’s degree in electrical engineering. “We had three extremely qualified candidates apply to head the RMLD, but Coleen’s work history and approach stood out,” said John Stempeck, chairman of the department’s Board of Commissioners, in a written statement. “We look forward to working with Coleen and anticipate a smooth transition. The board would also like to thank interim general manager Kevin Sullivan, who has done an excellent job.” Established by a Town Meeting vote in 1894, the light department serves 29,000 customers in Reading, North Reading, Wilmington, and Lynnfield.