Clean energy from sun and wind is growing in India.
Power must be saved for times when the sun isn’t shining.
Batteries that store energy for many hours are called long‑duration storage.
These batteries are currently expensive, making them hard to use widely.
To keep the lights on at night, the country needs batteries that can store electricity for more than six hours.
Short‑duration batteries work for only a few hours and are not cheap enough for this job.
Long‑duration storage can help, but it costs a lot right now.
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