Business Green: Two of the UK’s leading renewable energy firms announced yesterday that they are to team up as part of a pioneering project that could serve to slash the carbon footprint of low-carbon technologies. In what is being hailed as a world first, wind energy provider Ecotricity confirmed it is working with Cardiff-based solar cell manufacturer G24 Innovations (G24i) to install a 120-metre tall wind turbine at the company’s Wentloog plant. The company said the turbine will be up and …