Sustainable Energy Storage for the Electricity Grid

Sustainable Energy Storage for the Electricity Grid

Sustainable energy storage is crucial for unlocking renewables’ full potential to power our world.sustainable energy storage At a grid-scale level, it can provide the flexibility necessary to balance fluctuating solar and wind generation with consistent demand, reduce expensive peaker plant operation, and smooth out power supply volatility. Storage can also help defer the need for new transmission infrastructure or other costly investments in fossil fuel-based energy resources, and it can deliver electricity faster than traditional plants.

Energy is stored all around us in different forms: The fizzy water in your refrigerator holds energy under pressure, while an avalanche or volcanic eruption releases energy through rapid movement.sustainable energy storage But the kind of energy storage needed for the electricity grid is much more complex. This type of energy storage must be fast-responding and pack a lot of power into a small space.

Battery technology is currently the most popular way to store large amounts of electricity, and with significant innovation it may be capable of providing the energy services that grids need without reliance on fossil fuels.sustainable energy storage But it is still very expensive, and its usefulness may be limited by its need to operate at a very high temperature. Alternatively, thermal energy storage—using surplus electricity to chill ambient air until it liquifies—is another possibility. When it’s time to use the electricity again, the liquified air expands and powers turbines that generate electricity.

Pumped hydro storage is a more long-term solution that can store energy for up to 100 hours, and it is already being used in some countries. These facilities are awe-inspiring: For example, the Bath County Pumped Storage Station in Virginia consists of two sprawling lakes connected by a series of canals among tree-covered slopes. However, pumped hydro requires large amounts of land and water that are often in remote locations. And its construction is expensive and challenging.

Energy storage can also reduce the need for existing fossil fuel-burning peaker plants to run during limited times throughout the year to meet high electricity demands, like heat waves. These plants are often located in urban areas, and they produce a lot of pollution. By storing excess renewable energy, storage can enable these plants to retire and reduce electricity prices for customers during peak demand periods.

Grid-scale energy storage can also improve the efficiency and reliability of existing grid infrastructure by responding quickly to changes in supply or demand, regulating voltage, and reducing congestion. It can also allow a greater share of variable renewables to be added to the grid, and it can avoid the need for backup generation.

Energy storage can be combined with community solar or aggregated home and commercial rooftop projects to create community-level microgrids or resiliency hubs, which can meet local electricity needs in the event of natural disasters. This is a powerful approach to building a clean, resilient, and affordable energy system, and it can play an important role in helping communities achieve their net zero energy goals. The key is to build the right energy storage systems for the conditions, needs, and uses of each community.