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Figure A3.1. Disaggregation
into Sectors, Sub-sectors and End Uses
Key Terms
Useful Energy: Delivered energy minus losses estimated for boilers, furnaces,
water heaters and
other equipment in buildings; used for estimates of heat provided
in space and water heating.
Activity or Output: Basic unit of accounting for which energy is used; for
example, in space heating,
it is the area heated; in manufacturing, it is the
production measured as value-added in real terms as in the output in tonnes of steel
or number of widgets.
Energy Intensity: Energy ‘consumed’ per unit of activity or output.
Structure: Refers
to the activity mix; for example, modal mix (trucks, rail, ships) in
travel, energy end uses in households and the shares of each sub-sector in total
manufacturing value added.
Energy Services: Implies actual services for which energy is used: heating a given
amount of space to a standard temperature
for a period of time, etc. Here, a measure
of energy service demand in a sector is obtained from combined activity and
structure measures.
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