Electro-Thermal Energy Storage (ETES) not only allows bulk energy storage in the hundreds of MWh, but also combines industrial, commercial and domestic sectors and their distinct energy needs for economic benefit and efficiency.
The trigeneration energy-management system based on the use of CO2 (R744) at supercritical conditions as the working refrigerant is the only large-scale energy storage capable of using, storing and distributing heat, cold and electricity simultaneously. With ETES, heating needed for food processing and district heating can meet cooling for applications like data centers, warehousing and large commercial buildings, as well as electricity storage capabilities to support grid balancing and renewable energy optimisation – all in a single system.
Although conceived with renewables in mind, any source of electricity can be used to energise ETES. Consequently, margins may be found in some markets by ‘time-shifting’ energy from low-cost night time power to peak load daytime markets. Using ETES, there are clearly multiple opportunities available from peaking markets and other power system functions such as grid balancing.
At the heart of the system is a reversible patented thermodynamic cycle for the conversion of electrical energy into thermal energy in the form of hot water and ice. The stored thermal energy can be directly distributed or reconverted into electrical power depending on demand. Scalable and site-independent, the closed CO2 cycle, which is compressing and expanding through turbomachinery and storing or extracting the resulting heat and cold in insulated water tanks, is low risk, has high resilience (similar to a fridge) and has a low environmental impact.
ETES achieves the goal of increasing the renewable energy contribution and coupling the heating, cooling and power sectors, cutting across today’s silo mentality of the industry.
EHPA invites everyone to submerge themselves in the possibilities that heat pumps are capable to offer in several industrial sectors. To read more stories the updated booklet is currently available on EHPA’s website.