future investments in the heat sector
Also in the heat sector the Energy [R]evolution scenario would require a major revision of current investment strategies in heating technologies. Especially the not yet so common solar, geothermal and heat pump technologies need enormous increase in installations, if these potentials are to be tapped for the heat sector. Installed capacity needs to be increased by a factor of 70 for solar thermal and even by the factor of 510 for geothermal and heat pumps. Capacity of biomass technologies, which are already rather wide spread still need to remain a pillar of heat supply.
Renewable heating technologies are extremely variable, from low tech biomass stoves and unglazed solar collectors to very sophisticated enhanced geothermal systems and solar thermal district heating plants with seasonal storage.Thus it can only roughly be calculated, that the Energy [R]evolution scenario in total requires around $ 3,896 billion to be invested in renewable heating technologies until 2050 (including investments for replacement after the economic lifetime of the plants) - approximately $ 97 billion per year. Due to a lack of (regional) information on costs for conventional heating systems and fuel prices, total investments and fuel cost savings for the heat supply in the scenarios have not been estimated.