Rhyl Flats wind farm is 8km off the north Wales coast in average water depth of eight metres. It has been fully operational since March 2010 and consists of 25 Siemens 3.6MW turbines with a total capacity of 90MW.
Greencoat UK Wind has also bought a 24.95% interest from RWE, following its stock market flotation.
By selling a minority stake in Rhyl Flats, RWE will raise new capital which it plans to invest in other renewable energy projects in the UK.
GIB chief executive Shaun Kinsgbury said: "The UK Green Investment Bank is delighted to announce this important investment in the UK offshore wind sector, which is a priority sector for us. Rhyl Flats was an ideal investment for us as it helps to develop the market for buying and selling operating offshore wind assets, allowing the release of capital back to the original developers, which will be invested in new renewable projects in the UK. At the same time as developing a market, this investment will deliver a commercial return to the bank."
The UK Green Investment Bank was formed in May 2012 with £3b of public money to invest in energy projects.
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