Recently work on yields is published in Renewable and Sustainable Energy Reviews (Powell and Rutten, 2013). Its philosophy is in line with GTAP, namely low entry barriers for CGE analysis, whereas its modular set up facilitates working in (cross-institutional) modelling teams and allows to build in dedicated modules linking it with other models (for example the IMAGE model). Currently the system is used at LEI-WUR, JRC-IPTS and TI (previously known as vTI).