Energy storage enables us to make renewable sources more reliable for grid operation while making electric vehicles financially feasible and accelerating decarbonization across both transport sectors and homes.
Batterie storage technologies include lithium-ion (such as in your cellphone), lead acid, sodium-sulfur and flow batteries. Other forms of storage may include pumped hydro storage systems or thermal and mechanical energy storage solutions.
1. Reliability
Energy storage helps balance supply and demand on the grid by quickly responding to changes or drops in electricity by discharging power in fractions of seconds, helping reduce costly upgrades to transmission and distribution lines that cannot handle peak electricity loads.
Battery energy storage solutions can serve as backup power in homes and businesses that cannot afford standby generators, rural communities experiencing wildfires or flooding, microgrids or resiliency hubs for localized backup power needs during high demand times, as well as helping prevent price spikes for electricity customers during peak pricing periods.
2. Flexibility
Energy storage devices capture electricity from the grid when prices are lower, saving it for times when prices are higher. Such systems can include lead-acid and lithium-ion batteries, kinetic (pumped hydro storage), or thermal energy storage technologies like ice and chilled water tanks.
Behind-the-meter battery storage solutions allow organizations to become more flexible about when and how they consume energy, helping to decrease energy bills while increasing renewable use – especially solar!
Energy storage provides grid services currently provided by fossil fuel peaker plants that operate intermittently during periods of high demand, making an important contribution toward clean, reliable, affordable electric power. Furthermore, storage devices help balance supply and demand on an hour-to-hour basis to improve power quality, reliability, and security.
3. Cost
The Energy Storage Grand Challenge (ESGC), spearheaded by the Department of Energy, seeks to double annual gigawatt-hour installations by 2030 – with cost being one of the major barriers in reaching this goal.
To achieve this goal, the ESGC has broken down the unit cost of energy storage into levelized costs of power and electricity services, similar to Levelized Cost of Energy (LCOE). This metric captures investors’ average per-kWh price in order to break even over its lifecycle, provided no one exceeds rated capacities during charging or discharging and that duration values of systems are optimally chosen.
4. Security
Electricity storage helps balance supply and demand, improving power quality (avoiding momentary spikes, sags or outages). Furthermore, electricity storage provides essential ancillary services that keep power grid frequency constant on an hour-by-hour basis. Popular energy storage solutions include pumped hydro, batteries (lithium-ion are the most popular nowadays), flywheels compressed air energy storage solutions or thermal energy storage such as molten salts or ice.
Localized energy storage can replace fossil fuel peaker plants in providing grid services, relieving stress on the system and mitigating price spikes during heat waves or periods of peak demand for electricity. These systems may be deployed alone or combined with community solar projects or aggregated home and business rooftop solar projects in order to form resilience hubs within communities.
5. Renewable Energy
Energy storage devices (ESSs) can help renewable energy sources better match electric power demand by smoothing their output and helping align it more closely. In grid applications, ESSs respond quickly when energy demands from the grid increase by charging during periods of excess renewable generation and discharging when peak demand occurs – both charging and discharging when requested by supply request from the grid.
Storage technologies come in various forms, from the rechargeable batteries in your mobile phone to large pumped hydro storage systems with enormous energy storage capacities. Other forms include fossil fuels such as coal and natural gas storage as well as thermal storage using molten salt for concentrated solar power systems.
Residential, commercial, and industrial electricity consumers alike can utilize ESSs to reduce demand during peak periods, which in turn helps them lower their electricity bills. This form of storage is commonly known as behind-the-meter solar.