from 1993–2001 nef worked closely with the energy saving trust, setting up the uk's network of energy efficiency advice centres (eeacs) on their behalf, and managing the network for the first five years. but as domestic energy efficiency moved more into the mainstream, nef expanded its interests into renewable energy (from 1995) and non-domestic energy efficiency, through its management of the energy efficiency accreditation scheme from 1998 onwards. in 2005 this scheme was transferred to the carbon trust but still managed by nef; in 2008 it was relaunched as the carbon trust standard with some nef administrative involvement until 2013. nef's current focus includes post-occupancy building performance evaluation, as well as identifying strategies to minimise the performance gap between the design and in-use energy consumption of buildings. it also works with housing stock owners (such as uk local authorities and housing associations) to minimise tenants' housing use, and operates a number of regional programmes to combat fuel poverty.