Energy storage allows electricity to be stored and then released at specific times for consumption, helping reduce demand from inefficient fossil fuel power plants located near low-income and marginalized communities.
Current Energy Storage Solutions (ESSs) tend to rely heavily on lithium-ion batteries (lithium-ion being the predominant option). Other technologies used in energy storage systems (ESS) include flywheel short-term storage; compressed air energy storage (CAES); and thermal energy storage systems that heat molten salts or freeze ice for long-term storage solutions that tend to be centralised solutions.
Resilience
Energy storage provides the critical buffer between supply and demand that prevents outages during grid disturbances, and regulating voltage levels to avoid damaging equipment while keeping frequencies stable – an invaluable service in areas with high renewable penetration where stress on equipment decreases while improving power quality for customers.
Resilience has become an increasing focus for public power utilities. Many power outages occur in rural communities further from the grid that are vulnerable to climate impacts. Storage systems provide backup power and integrate into community microgrids for increased resilience and meeting local energy needs; these can be owned, leased or financed through power purchase agreements; some use liquid-to-vapor technology while others utilize thermal energy storage methods like molten salt or ice as storage methods.
Flexibility
Energy storage systems provide long-term electricity storage and discharge. They can be used to add flexibility and frequency regulation services to the grid, or as backup power sources in remote communities such as rural homes or islands that lack electrical grid access.
ESSs can assist the grid services provided by fossil fuel peaker plants, which typically operate during specific times of year when electricity demand peaks in dense urban areas. This can reduce air pollution and health impacts in these overburdened communities while increasing intermittent renewable electricity generation by storing solar and wind energy for use at times when it is most needed; this practice is known as load shifting.
Community resiliency
Community resilience entails creating social connections within local areas that enable rapid responses to disasters, whether natural or manmade. This may involve building familiarity and trust within organizations like food banks or providing at-risk individuals with strategies designed to protect their health.
One key element of community resilience is energy reliability. Emergency infrastructure like hospitals, cell phone towers and gas stations rely on electricity for operation; historically these facilities resorted to backup internal combustion generators in case there were power outages.
As energy storage costs decline, they can become an integral component of microgrids to help ensure continuity of service during extreme weather events and provide grid stabilization and power quality improvements in high demand periods.
Energy efficiency
Energy storage is a crucial element of green energy solutions. It can reduce fossil fuel power plant needs by providing backup power when required; additionally, energy storage helps mitigate solar intermittency issues.
Transmission congestion and grid efficiency are reduced while renewable energy integration increases through cheaper wind and solar sources during times of peak demand.
Energy storage can also help lower electricity prices through time-of-use pricing. Storing energy when prices are low and discharging it during periods of high demand can save families and businesses money in regions that experience price spikes during heat waves, while at the same time eliminating expensive transmission lines from need. Furthermore, renewable energy-producing homes may use this backup source of power.
Cost
Energy storage systems can be invaluable assets for homes and businesses located far from the grid, serving to reduce backup system costs while safeguarding against interruptions from the power source.
Battery storage technology has advanced quickly since its early days, with rapid factory scale-up and fierce competition driving costs down rapidly. Today, large long duration utility-scale BESSs can now be built for under $125/kWh in global markets outside China and the US.
BESS cost decreases are being driven primarily by lower core equipment costs, longer lifespans and greater efficiencies; financing costs have decreased, as have revenue models supported by auctions; non-equipment costs are also declining; however, their effects do not correspond directly with project size so are therefore less of a factor.