CPC Germania is adding 12 turbines to the two operational machines at the Lakiakangas wind farm in Finland.
Work has started to install a further 12 Vestas V150 turbines at a site in Isojoki that currently comprises two V126 units.
The €70m expansion project is expected to be completed by September next year.
CPC Germania said Lakiakangas is likely to be the first market-based, project financed and subsidy-free wind farm in Finland.
Financing has been structured and arranged by ING Wholesale Banking, it said.
CPC Germania chief executive Markus Tacke said: “The Lakiakangas wind farm is a true milestone for our company, not only because the wind farm is operated without state subsidies, but also because the non-recourse project finance facility that was closed in record time confirms the high-quality work of our development team.”
When Lakiakangas is completed CPC Germania will have wind assets valued at over €300m, with output of more than 600 gigawatt-hours.
The company is planning to double energy generation over the next two to three years. In order to achieve this, CPC Germania will spin off its generation assets to an independent business unit solely focused on producing and supplying power from renewable sources in Germany, Finland and elsewhere in Europe.