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Sector coupling/smart energy system

by Linda Bertelsen
Smart energy system

Sector coupling is a key strategy for achieving a low-carbon and integrated energy system that can meet the growing energy demand and climate goals. Sector coupling can also create new opportunities for innovation, business models, and consumer choices.

Sector coupling is a term that describes the interconnection and integration of different energy sectors, such as electricity, heat, transport, and industry, to increase the efficiency and sustainability of the overall energy system.

Sector coupling can provide flexibility and stability to the power grid

Sector coupling can enable the use of renewable energy sources in sectors that currently rely on fossil fuels, such as heating and mobility, and thus reduce greenhouse gas emissions and enhance energy security. Sector coupling can also provide flexibility and stability to the power grid by using technologies that can convert, store, or use electricity and heat from variable renewable sources.

The use of excess electricity from renewable sources

Excess electricity from renewable sources can produce heat for buildings or industrial processes. For instance, electric boilers, heat pumps, or resistance heaters can convert electricity into heat and store it in thermal energy storage systems, such as water tanks or underground reservoirs. With more and more electricity produced from renewable sources such as wind and solar, electricity production becomes more volatile.

Sometimes, there is too much power production and wind power must be turned off to balance the power grid, and sometimes there is not enough power production from solar and wind – due to weather conditions. In a smart energy system with district heating, the heating sector can support the power sector in many ways.

CHP plants, based on green energy sources, can produce power if there is a lack of renewable electricity production and, at the same time, produce heat. The heat can be stored in thermal energy storage (TES).

Thermal energy storage

If renewable power production exceeds the use of electricity, the heating sector can produce heat from electrical sources such as heat pumps and electrical boilers. If this produces too much heat, it can be stored in thermal energy storage that can be used later. This is by far the cheapest approach to store energy.

Producing Power-to-X

Another opportunity is to produce Power-to-X: This is a general term that covers any technology that converts electricity from renewable sources into other forms of energy or products, such as chemicals, fertilizers, plastics, or metals. The waste heat in these processes can be used in district heating systems.

Waste heat from industrial processes

Using waste heat from industrial processes or power plants to provide district heating or cooling for buildings or communities.
This is also referred to as Smart Energy System. A smart energy system is a system that uses renewable energy sources, such as wind, solar, hydro, biomass, and geothermal, to produce electricity and heat for various applications. A smart energy system also uses technologies that can store, convert, or use energy in different forms and sectors, such as batteries, hydrogen, electric vehicles, or district heating and cooling.

A smart energy system

A smart energy system aims to optimize the overall energy system’s efficiency, reliability, and sustainability by using digital technologies, smart devices, and data analytics to monitor, control, and coordinate energy flows across different domains and regions.

A smart energy system can provide many benefits for the environment, the economy, and the society. Some of these benefits are:

      • Reducing greenhouse gas emissions and air pollution by avoiding the use of fossil fuels
      • Increasing the share of renewable energy in the energy mix and enhancing energy security and diversity
      • Lowering the energy costs and creating new business opportunities and jobs for the energy sector
      • Improving the power quality and resilience of the grid by providing flexibility and stability
      • Empowering the consumers and enabling them to participate in the energy market and benefit from dynamic pricing schemes.