Discussing the grid friendliness of carbon dioxide energy storage.

In recent years, China's new energy has developed rapidly, with a steady increase in installed capacity. The proportion of new energy power supply in the power system has been continuously increasing, and a new type of power system has gradually taken shape. As an indispensable component of the new power system, the grid friendliness of energy storage technology determines its potential for development in the future electricity market.

What is grid friendliness? Why is grid friendliness so important?

Grid friendliness refers to the degree to which the characteristics and functions of energy storage technology are adapted to the operation and scheduling of the power grid. In short, it means whether the power grid is willing to call on facilities that use a certain energy storage technology route. Grid scheduling directly affects the profitability of the energy storage sector, which in turn affects the market potential of energy storage technology routes.

From the current existing energy storage technology routes, carbon dioxide energy storage is one of the most grid friendly energy storage technology routes, mainly reflected in the following four points:

System efficiency, power, and capacity stability Exa Energy Tech

The power grid is the artery that connects the power supply side and the load side. Therefore, the safe and stable operation of the power grid is the ultimate goal of all scheduling plans. With the increasing proportion of new energy electricity, problems such as low inertia, high fluctuation, and weak support have brought huge challenges to the smooth operation of the power grid. Therefore, the efficiency, power, and capacity of the energy storage system must be able to remain stable and cannot have significant attenuation throughout the entire life cycle. Otherwise, the scheduling plan of the power grid will deviate due to this attenuation, affecting the operation of the power grid.



The main power equipment of the hundred kilowatt hour carbon dioxide energy storage system adopts currently mature mechanical equipment, and the operating efficiency has been verified in the market for decades, which can ensure that the efficiency and power of the system will not have typical attenuation during the life cycle. Moreover, the system operates in a closed cycle, and the system capacity will not have typical attenuation.

Rotational inertia supports Exa Energy Tech

The moment of inertia is an important support for the power grid to cope with sudden load fluctuations. As the proportion of new energy electricity increases, the proportion of power generation with moment of inertia gradually decreases. When the power generation with moment of inertia is below a certain level, the power grid needs additional moment of inertia support.



The operating principle of the 100 kWh carbon dioxide energy storage system unit is similar to that of thermal power units, both of which are rotating machinery and therefore have their own moment of inertia. The carbon dioxide energy storage system in grid connected state can not only provide stable power dispatch support for the power grid, but also provide rotational inertia support for the power grid.

Operational Stability in Different Seasons Exa ˣ Energy Tech


China has a vast territory with significant differences in environment and climate across different regions throughout the year. Different environmental and climate conditions not only test the safe and stable operation capability of the power grid, but also pose huge challenges to the operation of energy storage facilities. Only energy storage technologies that can maintain stable output under different environmental and climate conditions can provide strong support for the safe and stable operation of the power grid.

The 100 kWh carbon dioxide energy storage system is designed with an insulation and pressure maintenance mechanism, and the system adopts a closed cycle. Therefore, the system operation is not affected by external environmental and climatic conditions, and its efficiency can be fully guaranteed. It can stably output under different geographical environments and climatic conditions.

Adaptability to Grid Dispatch Scenarios Exa Energy Tech

The intermittency of new energy power requires a large amount of energy storage to solve the problem of circular supply. Therefore, in the actual operation of the power grid, energy storage units are required to have the ability of fast charging and slow discharging or slow charging and fast discharging for different application scenarios, in order to meet the different scheduling needs of the power grid.



The power unit and capacity unit of the 100 kWh carbon dioxide energy storage system are designed to be decoupled, which enables the system to be independently expanded on one side. The power of the system's expandable charging unit enables fast charging and slow discharging; It can also expand the power of the discharge unit to achieve slow charging and fast discharging; At the same time, individual capacity units can also be expanded to achieve free expansion of energy storage duration. The system can be configured differentially according to different grid scheduling needs to meet different scenario requirements.