Utilisation Hours

Utilisation hours are a technical, business-economic indicator in energy management. They are derived from the ratio of annual electricity consumption (kWh) to the peak demand (kW) of a consumer over the course of a year. The indicator shows how evenly a consumer loads the grid throughout the year.

How are utilisation hours calculated?

The calculation is carried out using the following formula:

Utilisation hours = annual consumption (kWh) ÷ peak load (kW)

Example: A company consumes 1,000,000 kWh per year and has a maximum power draw of 500 kW. The utilisation hours then amount to 2,000.

Why are utilisation hours important?

Utilisation hours not only provide information about how constantly a consumer loads the grid, but are also a decisive variable within the 2,500h rule of the German Electricity Grid Fee Ordinance. Here, grid fees are structured differently depending on the number of utilisation hours.

How do utilisation hours influence grid fees?

In the usual tariff logic, the relative shares of the demand price and the energy price are adjusted at higher utilisation hours. Consumers with an even load profile can thereby move into a more favourable grid-fee structure than those with strong peak loads.

Utilisation hours in energy management

In energy management and in strategies for grid-fee optimisation, utilisation hours are a central indicator. They help to identify peak loads and to plan measures such as peak shaving or battery storage strategies in order to optimise grid fees.

Frequently Asked Questions (FAQs)

How are utilisation hours calculated?

Utilisation hours are calculated by dividing the annual electricity consumption (kWh) by the maximum power draw (kW). They indicate how evenly a consumer loads the grid over the year.

Why are utilisation hours important?

Utilisation hours provide insight into a consumer’s load profile and in many cases determine how grid fees are calculated – for example within the 2,500h rule.

How do utilisation hours influence grid fees?

Grid fees are structured differently depending on the number of utilisation hours. High utilisation hours can lead to more favourable energy prices, as the grid load is distributed more evenly.

What role do utilisation hours play in energy management and storage strategies?

They help companies optimise load profiles and develop suitable storage concepts or load-management strategies in order to reduce grid fees.

How are utilisation hours and the 2,500h rule connected?

The 2,500h rule uses utilisation hours as a reference value in order to apply different grid-fee models depending on the level of utilisation hours.