The calculation of savings plays a key role in assessing the extent to which energy and climate targets are being achieved. Among other things, these calculations are needed to monitor and control political support schemes, i.e., to assess their impact and to avoid "flying blind".
- Savings can relate to the use of goods or services and/or the release of pollutants into the environment (e.g., carbon dioxide emissions).
- The calculated savings depend on a large number of assumptions.
- A very important assumption regarding the system boundary is the choice of calculation method: Depending on whether an energy-saving measure is considered over a short period of time, a long period or over its entire lifetime, the savings can be substantially different. Each of these different calculation methods have their place, but their appropriateness depends on the objective and perspective.
- In addition to the calculation method, the established reference basis (e.g., the legal minimum standard), the time of analysis (e.g., estimation for planning as opposed to monitoring after implementation), and the assumptions about service life and the duration of impact play an important role.
- In addition, adjustments for distorting influences are necessary. If a publicly funded measure, for example, was implemented without the funding, it could only be taken into account proportionately. In most cases, both unadjusted gross savings and adjusted net savings are reported.
- For the calculations data from different sources (grant applications, surveys, statistics, etc.) can be used which may vary in quality.
- In the context of energy policy, energy savings in particular are often used to determine additional values, especially emission reductions and energy cost savings.
- Overall, caution should be exercised when comparing savings. It helps to have a transparent calculation methodology and an awareness of the possible assumptions which have been made.
Calculating savings for funding schemes (EN) or
Einsparberechnungen für Förderinstrumente (DE)