The monsoon season represents the most significant hurdle for India’s transition to solar energy, as prolonged periods of heavy cloud cover can create substantial gaps in the power supply. While modern battery technology successfully manages the daily cycle of storing afternoon sun for use at night, it currently lacks the capacity to bridge the multi-day stretches of low light common during rainy months, according to the authors of the newly released report.
The report highlights that “the main challenge is not shifting solar generation from day to night with batteries but maintaining supply during extended periods of weak solar output, especially during the monsoon.” The analysts further clarify that while batteries are effective for short-term needs, they “cannot carry large amounts of solar output across extended cloudy spells.”
To understand this, think of solar panels as a tool to catch sunlight and batteries as a storage tank. On a normal sunny day, you catch enough energy to fill the tank for use overnight. However, during the monsoon, the flow of sunlight slows to a trickle for several days or weeks. Because the tank is typically sized to hold a single day’s worth of power, it quickly runs dry if it isn’t being constantly refilled by strong sunshine, leading to a shortage of electricity.
The report “Battery storage is now cheap enough to unleash India’s full solar potential” was published by the energy think tank Ember on April 7, 2026. It was prepared by a team of analysts led by Kostantsa Rangelova and Duttatreya Das.
