Electricity support firm Omexom, formerly known as Powerteam, has won three contracts worth a total of £3m.
The Belfast firm secured deals for onshore wind farms in west Devon in England, Lockerbie in Scotland, and Monaghan.
Omexom, which is owned by French firm VINCI Energies, works on power generation, transmission, transformation and distribution.
The deals mean the company now has more than 50 electricity grid-lined wind farms.
Jonathan Greer, business unit general manager at Omexom UK Renewables, said: "We are thrilled to have won the new contracts, following a highly competitive tender process.
"Omexom will be responsible for high voltage electrical solution design, the procurement and installation of electrical equipment, cabling works and overall project management.
"These are significant wins for our business, and they help establish our position as one of the leading electrical infrastructure providers in the UK."
The Devon contract begins in January and runs for five months. The project will generate 18MW of electricity for Renewable Energy Systems after it has finished.
And from February to August, Omexom will work with civil contractor I&H Brown on a wind farm for Scottish Power Renewables.
Finally, work on Old Mill, in Co Monaghan in the Republic of Ireland, with contractor NRS Group, will run from November to May next year, and will generate 17MW of electricity for Storm Energy.
Alastair Dawson, managing director of Omexom, praised the deals and said the company's future looked bright.
He added: "It has been an exciting year for the company, most notably being welcomed into the Omexom brand."
Omexom recently took part in the RenewableUK 2015 Annual Conference in Liverpool. It had been part of ESB, following the southern firm's acquisition of NIE in 2010, before being sold to VINCI Energies in 2013.