(c) Accelerating the optimization of building energy consumption structure We will work deeply to promote the use of renewable energy in buildings, and expand the integration of photovoltaics into buildings. We will actively promote clean energy heating in regions with cold and severe cold conditions. We will promote central heating with combined heat and power, and speed up the large-scale application of residual heat from industrial processes in heating systems. We will launch demonstrations of nuclear heating in an active and prudent manner, and promote clean, low-carbon heating using heat pumps, biomass, geothermal energy, and solar energy according to local conditions. We will guide regions with hot summers and cold winters in procuring heating through rational, clean, and highly efficient means based on their conditions. We will increase proportion of buildings energy consumption on electricity, and construct buildings integrating photovoltaic power generation, energy storage, DC power distribution, and flexible power consumption. By 2025, renewable resources will account for 8% of the alternative to conventional energy used in buildings, and we will strive to reach 50% photovoltaic coverage on the roofs of newly constructed public buildings and factories. (d) Promoting a low-carbon transition in rural development and energy consumption