The 49.9MW scheme on Anglesey will generate enough electricity to power around 15,500 UK homes or 14,000 electric vehicles every year.
Developed by Countryside Renewables, the project is expected to help save around 612,000 tonnes of carbon over its 30-year lifetime.
Managing Partner John Dunlop said: “The installation will be the first in Wales of a new generation of cutting-edge solar photovoltaic projects that includes an option for energy storage. This capability enables the project to be a ‘peaker plant’, storing electricity generated during the day and releasing it at times of peak demand.
“It can also provide frequency response services to the grid. This storage option combined with the economies of scale from the size of the project allow it to deliver the government’s three objectives of secure, clean and affordable energy supplies.”