Could Solar Plus Storage Supply 90% of India’s Electricity Demand?
India’s energy transition is entering an important new phase. Solar power has grown rapidly over the past decade, but one fundamental limitation remains: the sun does not generate electricity after sunset.
Battery storage could change that equation.
New modelling from Ember suggests that solar plus battery storage could supply up to 90% of India’s electricity demand at a competitive levelised cost of electricity of around ₹5.06 per kWh. The analysis also estimates that solar-plus-storage systems could meet between 83% and 92% of electricity demand across India’s ten largest electricity-consuming states.
The findings highlight an important shift in how India can think about renewable energy. The opportunity no longer revolves only around installing more solar panels. India also needs to store, manage and deliver that electricity when consumers need it.
How Solar Plus Storage Works
Solar panels generate electricity when sunlight reaches them. During strong daylight hours, a solar installation can produce more electricity than a home, commercial building or grid needs at that moment.
Instead of allowing that excess energy to go unused, a battery energy storage system can store it.
Later, when solar generation falls, the battery can release the stored electricity.
This creates a simple energy cycle:
Solar generates during the day → batteries store excess electricity → storage supplies electricity when solar output falls.
This capability makes solar much more flexible. Businesses can use stored electricity during evening demand periods, while households can shift more of their solar consumption beyond daylight hours.
Why Battery Storage Matters for India
Solar power already offers India a major domestic energy resource. The country has vast solar potential, and solar generation can reduce dependence on conventional power generation and imported fuels.
However, electricity demand does not follow the sun perfectly.
People return home in the evening. Commercial facilities continue operating after sunset. Industrial facilities may require electricity around the clock. The grid therefore needs resources that can respond when solar generation declines.
Battery storage provides that flexibility.
Ember’s modelling estimates that reaching the 90% national electricity-demand share would require around 930 GW of solar capacity and 2,560 GWh of battery storage.
Falling battery costs have also improved the economics of this approach. According to reporting on the Ember analysis, global turnkey battery costs fell sharply in 2024 and again in 2025, helping make storage-backed solar increasingly competitive.
The Monsoon Challenge
Solar plus storage does not eliminate every challenge.
India’s monsoon creates an important test for renewable energy systems. Batteries can easily help shift electricity from sunny afternoons into evenings, but consecutive days of weak sunlight create a much larger challenge.
When solar output remains low for several days, batteries have fewer opportunities to recharge. The Ember analysis identifies extended periods of low solar output, particularly during the monsoon, as a major constraint. During the July monsoon period, solar and batteries could meet only around 66% of demand in the modelling.
This does not weaken the case for solar. Instead, it highlights the importance of building a diverse and flexible clean-energy system.
Wind, hydro, longer-duration storage, transmission infrastructure and other flexible resources can complement solar when generation patterns change.
What Does This Mean for Indian States?
The state-level findings make the opportunity even more interesting.
The modelling estimates that solar plus storage could supply 83–92% of electricity demand across India’s ten largest electricity-consuming states. Seven of those states could reach at least 90% under the modelled configuration.
This variation matters because every state has different electricity-demand patterns, solar resources and weather conditions.
States with strong solar resources and demand patterns that align well with solar generation can capture significant benefits. Other states may need more complementary generation and storage to manage seasonal mismatches.
That means India does not need one identical renewable-energy model everywhere. Regional planning can help each state combine solar, storage, transmission and other clean-energy resources according to its needs.
What Solar Plus Storage Means for Homes
For households, solar plus storage can increase the value of rooftop solar.
Instead of using solar electricity only while the panels generate it, homeowners can store excess daytime generation and use it later.
That can help households:
- Increase their use of self-generated solar electricity
- Shift solar consumption into evening hours
- Improve resilience during certain grid disruptions
- Reduce dependence on grid electricity
The exact financial benefit depends on electricity tariffs, system size, battery costs, solar generation, household consumption and local regulations.
What It Means for Businesses
Businesses can potentially gain even more from combining solar with storage because commercial facilities often have substantial daytime and peak-hour electricity demand.
A solar-plus-storage system can help businesses use renewable electricity beyond daylight hours and manage when they draw power from the grid.
Potential benefits include better energy management, greater resilience, reduced exposure to electricity-price volatility and improved use of onsite solar generation.
For businesses with critical operations, storage can also form part of a broader energy-resilience strategy.
The Bigger Picture
India’s clean-energy opportunity goes beyond generating more electricity from renewable sources.
The country needs to make renewable electricity available when demand requires it.
That requires more than solar panels. It requires batteries, flexible generation, stronger transmission networks, better grid management and technologies that can respond to changing supply and demand.
The Ember modelling shows how far solar plus storage could potentially take India, but the 90% figure should not become a claim that solar and batteries alone can solve every energy challenge. The modelling itself highlights the need for complementary resources during prolonged low-solar periods.
The real opportunity lies in building an energy system where different technologies work together.
Solar can generate the energy. Storage can shift it. The grid can deliver it.
For Indian homes and businesses, that shift could make renewable energy more practical, flexible and resilient.
For India as a whole, it could become an important step toward a more secure and cleaner energy future.
Nirvahana is working toward that future by helping homes and businesses explore smarter energy solutions built around solar and clean-energy technologies.
