How does your measured or expected maximum demand relate to your reserved (contracted) capacity? Enter both values and the tool calculates utilisation, headroom and any exceedance. It is not a bill or tariff calculation — free, no sign-up; the calculation runs only in your browser.
The colour indication (below 80 % · 80–100 % · above 100 %) shows utilisation of the capacity you entered — not a distribution operator's tariff band.
Have several maximum demand values, such as monthly maxima over a year? Compare them with the same reserved capacity at once.
| Measurement | Maximum [kW] | Utilisation [%] | Indication |
|---|
Interval data shows how often and why demand approaches or exceeds the capacity — and what makes technical sense to do about it.
Reserved (or contracted) capacity is a contractually or technically defined power against which the actual load of a supply point can be compared.
The exact definition, how it is measured and its financial consequences depend on the country, the distribution operator, the voltage level, the tariff and the contract. This tool does not know or calculate them — it only compares the two values you enter.
The tool uses only these relations:
utilisation [%] = P_max / P_res × 100 headroom [kW] = P_res − P_max (if P_max ≤ P_res) exceedance [kW] = P_max − P_res (if P_max > P_res) exceedance [%] = exceedance / P_res × 100
Maximum demand is most often the 15-minute average power. If you only have the energy per interval, convert it first in the 15-minute demand calculator.
A single maximum or a single exceedance does not on its own tell you:
A decision needs the time profile, how often peaks occur, how long they last, their cause and the operating context.
This tool is a technical estimate for orientation. It is not a calculation of a distribution bill or of a penalty, tariff advice, a legal interpretation of a contract, an energy audit or an automatic recommendation to change the reserved capacity.
An exact assessment must be based on the current terms of the specific distribution operator and the specific supply point.