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Glossary · Energy industry & energy transition

End use

End Use Energy Service Electrification heat mobility Industry

An end use is the specific purpose for which energy is used at the end of the conversion and supply chain. It refers not to the energy carrier itself but to the application that is run with it. Examples include space heating, hot water, process heat, cooling, lighting, mechanical drive, information and communication technology (ICT), transport, drying, compression and electrochemical processes. In the electricity system, this is the level at which delivered energy becomes a usable function. End use is not a uniformly defined legal term. In German energy statistics, the same thing is usually called Anwendungszweck or Anwendungsbereich (application purpose or application area).

This level matters because, depending on the end use, the same quantity of energy places very different demands on power, availability, controllability and infrastructure. A kilowatt hour of electricity in a heat pump has a different technical effect from a kilowatt hour in an electrolyser, a server, a tram or a lighting system. The physical unit remains the same; the impact on the system does not.

Distinction from final energy, useful energy and energy service

End use is often confused with final energy. Final energy is the quantity of energy that reaches the consumer: electricity from the socket, natural gas at the house connection, heating oil in the tank or district heating at the transfer point. The end use, by contrast, describes what this final energy is used for. Electricity is therefore not an end use but an energy carrier. Space heating, motive power or lighting are end uses. EU law defines final energy consumption in the Energy Efficiency Directive (EU) 2023/1791 by sector, not by purpose. It refers to the energy supplied to industry, transport, households, the services sector, agriculture and other end-user sectors.

End use also differs from useful energy. Useful energy is the energy that is actually available for the purpose after the last conversion: heat in a room, cooling, visible light or mechanical work at a shaft. The end use designates the purpose of use and the technical function behind it, even if several conversion steps are needed for it. One example is the heat pump: the final energy is electricity, the system additionally uses ambient heat, the useful energy is heat in the building, and the end use is space heating or hot water. How the ambient heat is counted depends on the accounting convention. The EU definition of final energy consumption in Directive 2023/1791 expressly excludes ambient energy.

One level further lies the energy service. In technical usage, this means the benefit that people or businesses actually demand: a warm home, a certain product quality, chilled food, mobility from A to B or an illuminated work surface. In EU law the term is defined more narrowly. Under Article 2, point 11 of Directive 2023/1791, an energy service is the physical benefit, utility or good derived from a combination of energy with energy-efficient technology or with action. It is provided on the basis of a contract and is intended to result in verifiable energy efficiency improvements or savings. Anyone using the term in legal contexts should bear in mind this contractual link. A German federal government draft bill of June 2026 transposing the directive refers to this EU definition for the German term. How far the procedure has progressed has not been checked here.

End uses in German statistics

In its application balances (Anwendungsbilanzen), the Arbeitsgemeinschaft Energiebilanzen (AGEB) breaks down final energy consumption into eight application areas: space heating, hot water, other process heat, air-conditioning cooling, other process cooling, mechanical energy, ICT and lighting. The energy balance proper does not show the conversion of final energy into useful energy, among other reasons because the underlying data are too uncertain. The application balances have therefore been prepared as a supplement since the 2014 reporting year, on behalf of the Federal Ministry for Economic Affairs. Their values are final energy, broken down by purpose, not useful energy.

As of October 2025, final energy consumption in Germany in 2024 was around 8,095 PJ. Of this:

  • just under 53 percent went to heat applications: space heating 27.4 percent, other process heat 20.4 percent, hot water 5.1 percent,

  • 38.2 percent to mechanical energy,

  • only a few percent to cooling, ICT and lighting.

The picture differs greatly by sector. Private households use around two thirds of their final energy for space heating. Industry uses about two thirds for process heat. In transport, around 98 percent is used for motive power.

For electricity, the distribution looks different. In 2024, electricity accounted for about 20.6 percent of final energy consumption, around 1,664 PJ or, converted, a good 460 TWh. About a third of it went into mechanical energy. Process heat, ICT, lighting and cooling each accounted for between just over 12 and just under 17 percent. Space heating and hot water together came to less than 8 percent. The figures are based partly on surveys and partly on model assumptions. In individual years they can be distorted by the weather and should therefore be read as orders of magnitude. The electricity shares for space heating in particular are likely to shift as electrification increases.

Why end uses shape the electricity system

In the classical electricity system, demand was largely regarded as a given load. Power plants and grids were planned so that they could meet this load at all times. With electrification, electricity takes over tasks previously performed by petrol, diesel, natural gas, coal or heating oil. End uses therefore determine when and where new electricity demand arises.

Heat pumps raise electricity demand mainly during the heating season. How much depends on the outdoor temperature, the building standard, thermal storage mass and user behaviour. Electric vehicles create charging demand at homes, workplaces, motorways and depots. How much they burden the grid depends on whether charging is uncontrolled in the evening or whether charging sessions can be shifted. Industrial process heat follows production schedules, quality requirements and temperature levels. Data centres need very high availability and, in addition, cooling. Each of these end uses creates its own load profile.

An annual quantity in kilowatt hours therefore says little about whether lines, transformers, generation capacity or storage will be particularly heavily loaded. What matters are timing, simultaneity and connection location. Two applications with the same annual consumption can contribute very differently to peak load. Conversely, a large quantity of energy can fit well into the system if it can be shifted in time or occurs at times of high renewable generation.

Flexibility arises in specific applications

The term end use helps to make blanket statements about flexibility more precise. Flexibility is not a general property of consumers. It results from technical processes, comfort limits, storage, production risks, metering and control technology, and economic incentives.

An electric car can charge flexibly if it is parked long enough and the desired state of charge is only needed later. In addition, the connection must be controllable, and a tariff or other signal must reward the shift. A heat pump can be shifted within certain limits if the building envelope, heating system and hot water storage are suitable for it. An industrial furnace does not become flexible simply because it is electrically powered: temperature control, product quality, shift operation and delivery obligations set narrow limits. For cooling, thermal storage can create room for manoeuvre; for lighting, hardly any.

Electricity consumption is therefore neither automatically a rigid load nor automatically flexible just because it is electric. The end use shows which technical degrees of freedom exist. Whether they take effect in the electricity system depends on institutional rules. These include metering systems, grid charges, dynamic tariffs, aggregation, data protection, connection conditions and clear responsibilities between supplier, grid operator, plant operator and user.

Typical misinterpretations

A common mistake is to equate rising electricity consumption from new end uses with rising total energy consumption. If an electric car replaces a combustion-engine vehicle or a heat pump replaces a gas boiler, electricity consumption rises while fuel use often falls significantly. The reasons are the more efficient conversion in the electric motor and the use of ambient heat in the heat pump. Whether and by how much the demand for primary energy falls, however, is not a fixed quantity. It depends on the electricity mix, the efficiency of the specific system and the accounting method. Anyone looking only at electricity consumption overlooks the shift between energy carriers and conversion chains.

A second oversimplification equates sector and end use. The buildings sector includes space heating, hot water, lighting, ventilation, cooling and appliances. Transport includes cars, buses, trains, trucks, ships, aviation and intralogistics. Industry includes low-temperature heat, high-temperature processes, motors, compressed air, electrolysis, drying and non-energy use. The AGEB tables show how differently the same purposes are distributed across the sectors. Sectors are useful for assigning responsibilities but do not explain the technical structure of demand.

A third misinterpretation looks at end uses only from the perspective of the device. A heat pump is part of a building, a heating system, a grid connection and a tariff relationship. A charging point is the interface between mobility demand, the distribution grid, metering, billing and, where applicable, grid-supportive control. The installation alone does not explain how it acts in the electricity system.

Institutional significance and system costs

End uses are often behind the meter, which makes them demanding for market rules. Grid operators usually see only the measured total load of a connection. Suppliers sell kilowatt hours but do not always know the flexibility of the devices. Manufacturers optimise for efficiency, comfort and cost, not necessarily for grid compatibility. Users expect a service, not participation in a complex electricity market. If flexible end uses are to help integrate solar and wind power, technical standards, price and tax signals, and consumer protection must fit together. An application can respond in a system-supportive way only if it is controllable, responsibility is clarified and the user does not bear an unreasonable loss of comfort or process reliability.

This level is also important for system costs. Costs arise not only from additional electricity quantities but also from connection capacity, simultaneity, grid reinforcement, metering and control technology, reserve requirements and market integration. An end use with high energy demand can be inexpensive to integrate if it can be shifted well. A smaller application can become expensive if it contributes strongly to local peak load or demands high security of supply at unfavourable times.

End use thus designates the point at which energy demand becomes concrete. The term separates the purpose of use from the energy carrier, from the quantity of energy delivered and from the desired service. For an electrified electricity system, this distinction is necessary. Only devices, usage patterns, market rules and grid infrastructure together determine what effect additional electricity consumption actually has.

Sources

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Edited by eCMS on 11.11.2026 19:45

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