These are the first prototypes for passivhaus homes at Ebbw Vale in Wales, to be on show at the Eisteddfod in July this year. 700 homes are planned for the site over the next few years. Wales is going zero carbon on all new homes from next year (2011) and it is possible that they will define zero carbon as based on the Passivhaus standard of energy efficiency. This is a definition of zero carbon that is 3 times more ambitious in terms of specific heat requirements than the English definition of zero carbon to be applied to new homes in England in 5 years time.