We have that, too. But highly insulated houses have new problems: air quality can be bad and houses need an extensive fresh air supply system. Moisture needs to

We have that, too. But highly insulated houses have new problems: air quality can be bad and houses need an extensive fresh air supply system. Moisture needs to be removed from the air, too. But if coal&oil, now gas and future electricity would be cheap, there would be little incentive to develop working solutions. There are also concepts like 'virtual power plants': a virtual power plant consists of a bunch of renewable electricity producers (solar, wind, ...) and a gas power plant for back up. The gas power plant would then also provide the heat for homes in a centralized fashion. The efficiency of such a gas power plant could then very high. This would work for residential areas. The gas could also in the future be produced from local renewable energy sources.