The firm has whittled down 18 bidders to eight firms to carry out works on substations ranging from 132KV to 11KV.
The latest framework arrangement lasts three years with the option to extend by two years and will cover the east and west Midlands.
Winning firms include: North Midland Construction, Alun Griffiths (Contractors), Manning Construction, Palmer Construction, Whitehouse Construction, Alpha Construction, Barhale and Sienna Construction