Is there a big space for power storage

5 terawatts (about 85-140 terawatt-hours) of long-duration energy storage capacity globally by 2040, which would mean that about 10% of electricity generated would have been stored at some point. Energy from fossil or nuclear power plants and renewable sources is stored for use by customers. Grid energy storage, also known as large-scale energy storage, is a set of technologies connected to the electrical power grid that store energy for later use. While battery capacity continues to grow (mostly from lithium-ion batteries), there is also focus on developing longer-term options that could provide stored energy.