The sites have a combined capacity of 38MW and will double REG's total wind power capacity to 72.2MW.
Gamesa will manufacture, erect and commission the turbines while also providing long term service and maintenance.
The cost of the projects is approximately £48 million.
The sites benefiting from the agreement are:
• French Farm (4MW)
• Rodbaston (4MW)
• Brackagh Quarry (6MW)
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• Mynydd Portref (12MW)
• Hallburn Farm (12MW)
Overall, the combined annual output will be 92,000MWh, which will increased REG's total annual wind power output to 183,000MWh.
The new projects are part of the company's plan to operate a portfolio of 300MW UK renewable energy projects including wind, solar and biopower within the next three years.
REG's CEO Andrew Whalley said: "REG is already a profitable, multi-divisional renewables company, and these five new projects will more than double our own-operated wind capacity in the UK to 72.7MW.
"Combined with our operational 26MW of bio-power projects, and the wind and solar assets we operate on behalf of third parties such as leading fund manager Blackrock, the total power generating capacity under our management will hit 150MW.
"At this point, we will be halfway towards achieving our stated objective to operate a portfolio of 300MW over the next three years across our wind, bio, solar and asset management divisions."
(LM/MH)
