Britain last year became the first G7 country to commit to reaching net-zero emissions by 2050, which will require an increase in renewable power generation.
"Onshore wind is now one of the cheapest ways of generating renewable or low-carbon energy, and Garn Fach (wind farm in Wales, Britain) will be developed without the need for public subsidy," said French utility EDF's renewables arm.
EDF Renewables will begin a feasibility study before submitting a planning application at the end of 2020.
The business already owns and operates two onshore wind farms in Wales, with a combined capacity of almost 25 MW.
Britain's largest onshore wind farm is Iberdrola Scottish Power's Whitelee in Scotland, which hosts 215 turbines capable of generating a combined 539 MW of electricity.
(Reporting by Susanna Twidale; Editing by David Goodman)