Causes, consequences and solutions
The electricity grid must always be in balance to ensure a reliable power supply. An imbalance occurs when actual electricity consumption and production deviate from the predicted amounts. This imbalance is measured and priced on the imbalance market, where a new imbalance price is published every 15 minutes. This price reflects the cost of measures needed to rebalance the grid.
What is grid imbalance?
Imbalance on the power grid means that the supply and demand of electricity are not matched. This can occur due to an energy shortage or an energy surplus. Because large-scale electricity storage is not yet efficiently possible, power must be generated when it is needed. At peak times, when demand is high, there may be a shortage of power. On the other hand, on sunny or windy days, the production of a lot of green power may actually create an energy surplus. Both situations can destabilize the power grid.
Consequences of imbalance
Imbalance brings risks to both producers and consumers. The grid operator ensures a stable grid. In the event of an energy shortage, power shortages must be quickly replenished, often through the imbalance market, which entails additional costs. These costs are often passed on to the end consumer. A surplus of power can lead to overloading of the grid, which can cause infrastructure damage and high costs.
Increase in imbalance due to energy transition
The transition to renewable energy sources, such as wind and solar power, brings new challenges. Because these sources are weather-dependent, their production is more difficult to predict, which can lead to imbalance more quickly. With conventional fossil energy sources, energy production is more adaptable, whereas with renewable energy, fluctuations must often be taken into account.
How can we prevent imbalance?
Avoiding imbalance is essential for a stable power grid. There are several solutions to achieve this:
- Use of self-generated power: Self-consumption of green power helps relieve the grid and saves costs.
- Matching consumption to supply: By using energy when green power is plentiful, and reducing it during peak hours, the grid can be relieved.
- Energy Storage Systems (EOS): With storage systems such as batteries, excess power can be stored and used at a later time. This prevents overloading during peak renewable energy production and supports the grid when demand increases.
Energy storage systems as a solution
Energy storage systems (EOS) play a crucial role in the energy transition. They store excess energy from solar and wind farms, for example, so that this energy is available at times when demand exceeds production. EOS help make efficient use of renewable energy sources and support a stable power grid.
Curtailment: curbing energy production
In some situations, it may be necessary to limit the production of renewable energy to relieve the grid, a measure called curtailment. At times when there is an energy surplus, wind turbines and solar panels can be temporarily turned off to reduce congestion on the grid and ensure stability. While this comes at the expense of generators’ revenues, it helps prevent negative energy prices and protect returns.
The role of the imbalance market
The imbalance market provides energy producers and suppliers with a platform to respond to unexpected fluctuations in supply and demand. Here they can purchase or offer energy to balance the grid, which is very important for grid stability. The price on the imbalance market varies based on current supply and demand and can be significantly higher or lower than regular market prices.
In conclusion
Imbalance on the electricity grid is an increasing challenge, partly due to the energy transition. The efficient deployment of renewable energy, the use of energy storage systems and the flexible matching of consumption to availability are some of the measures that help maintain balance on the grid. These solutions contribute to a robust and stable power grid that brings us ever closer to a sustainable future.