The deal will see Eco2Solar taking on Galliford’s existing solar PV contracts plus all new work from this month.
Eco2Solar sealed the win following a tough bid competition with three rivals.
Managing director Paul Hutchens said: “I am both delighted and proud to be working in partnership with such a well-respected and prestigious client as Galliford Try.
“This is the start of an exciting period for our business. We now have a solid platform to build a strong sustainable renewable energy business, enabling us to broaden and further extend our Eco2 brand.”
The business has grown rapidly since 2007 to become one of the leading renewable energy firms in the Midlands.