The deal gives Element Power the potential to incorporate a selection of Coillte sites within clusters of wind farms being developed for the Greenwire project across the counties of Kildare, Laois, Meath, Offaly and Westmeath.
Greenwire has a link to the UK National Grid in place, having earlier in the year secured two connection points in Wales.
Chief executive of Element Power Ireland Tim Cowhig says: “This is another great milestone for Greenwire.