Theay we gather and consume the energy needed for our buildings and infrastructure is changing fast.Fossil fuel demand is declining, while renewables are more widespread than ever – and look set to rise further.

But while we might be generating it more cleanly, reducing the amount of energy we use, without heavily disrupting our lives, is another challenge altogether.With buildings a huge contributor to carbon emissions, solutions in this area are becoming ever-more critical as we work towards a zero-carbon future.

Some projects, however, have already reached a goal that until recently would have seemed far too ambitious – creating more energy than they use through state-of-the-art technology.