Ontario had ample opportunity to learn from past experience and its Renewable Energy Subsidy Policy is on the whole quite good.However one part of the FIT program which gave a very generous 80.2c/KwH to micro installations of solar projects under 10 KW was faulty.It led to 160 MW of project applications which were ground mounted with very high production as they used trackers.There was no discrimination between roof and ground mounted micro installations leading to this problem.Note its not possible to install trackers on roofs which can increase the energy by 30-35%.The large number of applications were not factored in by the Ontario Power Authority (OPA) which proposed to retroactively cut those tariffs by 27% for ground plants.