The IPO – seen as a reflection of the inability of stretched European utilities to buy existing renewables assets – would eclipse the £260m raised by Greencoat UK Wind when it floated on the London Stock Exchange in May.

Last month UK solar investor Bluefield Partners announced plans to raise £150m on the LSE this summer.

Like both of those investors, RIG – backed by RES and London-based infrastructure investor InfraRed Capital Partners – will use the capital raised to buy existing renewables projects.

RIG