The contract was awarded after a tender process and builds on the company's existing relationship with Aurora Energy.
The agreement formalises the current working relationship between Unison Contracting Services and Aurora Energy, which began when Unison Contracting Services was selected to partner with Aurora Energy to undertake its Fast Track Pole Programme in 2016.
That programme focused on the replacement of overhead assets within the region and upon completion of the initial programme in December 2017, Unison Contracting Services was invited to remain in the area to assist Aurora Energy with other essential work.
"Unison Contracting Service's performance and the positive relationships we built during that time positioned us well for a long-term partnership with Aurora Energy, which has been recognised by Unison Contracting Services being appointed as an additional service provider after a competitive process," Unison Networks Group chief executive Ken Sutherland said.
While Unison Contracting Services' initial involvement with Aurora Energy was limited to overhead poles, the formalised agreement covers a much wider range of service provision, including design.
"The agreement we have reached with Aurora Energy exemplifies the capabilities of our group and our ability to collaborate and work with other Network Companies," Sutherland said.