nef has also been active in the area of renewable energy and, in particular, with integrating it into buildings and assisting local authorities and other bodies to create the right environment for a wider uptake of sustainable energy. since 2015, it has operated the formerly independent yougen website, targeted mainly at uk households wishing to install small-scale renewable energy measures. historically, it also provided secretariat functions to trade associations such as the solar trade association and the ground source heat pump association, as well as running from 2010-15 the green energy supply certification scheme that implemented ofgem's guidelines for marketing "green" electricity.