The UK Green and Sustainable Waste and Energy Investment Limited Partnership (UKGSWEI), is investing £11 million to hold a minority stake in the plant. The UKGSWEI fund, in which GIB is a cornerstone investor, is managed by Greensphere.

Co-investment was sourced by Greensphere from Signia Wealth Management and Stobart PLC.

"This investment will secure the long-term future of an important Welsh renewable energy plant and will improve its efficiency and sustainability.

The Greensphere fund was set up, in part, to help support the UK's waste wood biomass sector and its first acquisition of an operational asset is an important step."

The plant, Western Bio-energy Limited, is a 14.7 MW biomass facility and was the first commercial-scale power station of its kind in Wales. It has been operational since 2008 and currently produces enough electricity to power over 28,000 homes.

The investment in the Port Talbot plant will see a number of upgrades implemented. These will include an increase in Grade A waste wood as a fuel source, and refurbishment of the plant. This is expected to improve operational efficiency and reduce operational risk.

Greensphere has negotiated a contract to provide feedstock for the lifetime of the plant with Stobart Biomass, which will significantly increase feedstock reliability and reduce costs.

The Greensphere-managed fund forms a key part of GIB's investment strategy into the waste and bioenergy sector, one of its investment priorities. GIB initially awarded the competitive fund mandate to Greensphere to drive investment into small scale waste to energy projects. This is the fund's second investment since it was set up in July 2012.

Divya Seshamani, Managing Partner, Greensphere Capital LLP, added:

"We see the Port Talbot plant as a cornerstone of the waste-wood-to-energy platform we are building in this sector."