Daily load fluctuations of energy storage are too large

Is excessive energy storage a problem?

Spyros Foteinis highlights the acknowledged problem that an insufficient capacity to store energy can result in generated renewable energy being wasted (Nature 632, 29; 2024). But the risks for power-system security of the converse problem — excessive energy storage — have been mostly overlooked.

What happens if a power system has too much storage capacity?

Insufficient storage capacity may compromise power system reliability, including loss of load and generation curtailment, whereas excessive storage can lead to increased system costs and resource inefficiencies .

Why is energy storage oversupply a problem?

The expansion is driven mainly by local governments and lacks coordination with new energy stations and the power grid. In some regions, a considerable storage oversupply could lead to conflicts in power-dispatch strategies across timescales and jurisdictions, increasing the risk of system instability and large-scale blackouts.

What are the challenges in the application of energy storage technology?

There are still many challenges in the application of energy storage technology, which have been mentioned above. In this part, the challenges are classified into four main points. First, battery energy storage system as a complete electrical equipment product is not mature and not standardised yet.

Do energy storage technologies handle fluctuation and uncertainty in integrated energy systems?

The fluctuation and uncertainty in integrated energy systems are quantitatively defined. Various energy storage technologies for handling fluctuations and uncertainties are overviewed. The capabilities of various energy storage technologies for handling fluctuations and uncertainties are evaluated.

How flexible is the energy storage system?

To address these challenges, the future power system must have sufficient flexibility. The Energy Storage System (ESS) is an important flexible resource in the new generation of power systems, which offers an efficient means to address the high randomness, fluctuation, and uncertainty of grid power.