From a distance Steel Farm looks like a traditional Northumberland farmhouse, with its sandstone exterior and cluster of outbuildings. But inside, it is something very different.

Ever since the seminal Agenda 21 was endorsed by 150 nations including Ireland in 1992, increasing lip service has been paid to sustainable development in everything from government policy to manufacturers’ claims. However, as John Hearne describes, in Tralee Town Council’s Rath Oraigh housing development, local action has been taken with not only local, but global benefits that embody the principles of sustainable development.

John Hearne spoke to a number of independent energy experts to develop an impartial view of the main sustainable heating options.