Sector coupling means using clean electricity to power more parts of the energy system, not just lights and electronics. Wind turbines, solar panels, batteries, and smart grids can supply electricity to machines that provide heat, movement, and fuels. This matters because heating buildings and moving people or goods are major sources of carbon dioxide when they rely on coal, oil, or gas.
Linking power, heat, and transport helps renewable energy replace fossil fuels across daily life.
Key Facts
- Electrical energy transferred is E = P t, where E is energy, P is power, and t is time.
- Efficiency is efficiency = useful output energy / input energy.
- Heat pumps can deliver 2 to 5 units of heat for every 1 unit of electricity, described by COP = heat output / electrical input.
- Electric vehicle energy use is often measured in kWh per km or kWh per 100 km.
- Battery storage helps match renewable supply with demand by storing energy when production is high and releasing it when needed.
- Sector coupling reduces emissions most when the electricity comes from low-carbon sources such as wind, solar, hydro, or nuclear power.
Vocabulary
- Sector coupling
- Sector coupling is the connection of electricity, heating, transport, and industry so energy can move between them in useful ways.
- Smart grid
- A smart grid is an electricity network that uses sensors, communication, and controls to balance supply and demand.
- Heat pump
- A heat pump is a machine that uses electricity to move heat from a cooler place to a warmer place.
- Electric vehicle
- An electric vehicle is a vehicle powered by an electric motor using energy stored in a battery or supplied by another electrical source.
- Power-to-X
- Power-to-X is the use of electricity to make another useful energy product, such as heat, hydrogen, or synthetic fuel.
Common Mistakes to Avoid
- Treating electricity as the only energy sector is wrong because heat, transport, and industry use large amounts of energy too.
- Assuming all electric machines are automatically zero-emission is wrong because emissions depend on how the electricity is generated.
- Confusing power with energy is wrong because power is the rate of energy transfer, while energy is the total amount used over time.
- Ignoring efficiency losses is wrong because every conversion, storage step, and transfer can reduce the useful energy delivered.
Practice Questions
- 1 A heat pump has a COP of 3.5. If it uses 4 kWh of electricity, how many kWh of heat does it deliver?
- 2 An electric bus uses 1.2 kWh per km. How much electrical energy is needed for a 75 km route?
- 3 Explain why charging electric vehicles during sunny or windy periods can help a renewable energy system work more smoothly.