- The conversion of a coal-fired power plant into a renewable generation plant with thermal storage, considering the planned coal phase out, is proposed as an alternative to make use of its strategic location, existing facilities and electrical infrastructure. This could speed up the exit of coal combustion for the power generation in Chile. The objective of this technology is to take advantage of renewable energy to store that energy in the form of heat.
- There are currently two technologies: using electrical resistances that heat and melt salts, thereby storing the heat (Carnot Battery) and a second that uses hot air and volcanic rocks (Hot Rock). In both cases the stored thermal energy is converted into steam to be used by a conventional thermoelectric cycle (turbine, electric generator, cooling tower, etc.).
- The advantages of this type of technology are its contribution to the decarbonization of the energy matrix while maintaining the existing infrastructure, its operation, and jobs. Also, it contributes to the elimination of local pollutants.
Conversion of thermoelectric power plants
- Chile, according to the Energy Policy, must reach carbon neutrality by 2050. In this context and given that coal-fired generation represents 30% of CO2 emissions, the goal is to eliminate coal-fired power generation by 2040.
- The technology of converting coal-fired power plants into thermal energy storage plants, powered by renewable energies, would provide inertia, flexibility and reliability to Chile’s electricity system..
- Since 2019, GIZ, together with the German Aerospace Center (DLR), has been working on a pre-feasibility study for the first conversion of a coal-fired plant, with the Carnot Battery approach using experiences from the CSP plants and the disposals of salts, in northern Chile.
Animation Converted power plant
Video Converted power plant