Because growth in home solar without local storage creates significant grid challenges, Ember’s findings suggest that targeted financial incentives to speed up battery use in homes would reduce pressure on India’s electricity grid.  

India reached 164.6GW of total installed solar capacity in July 2026, with rooftop systems making up 30.7GW. Driven by fast home adoption, this rooftop share has tripled from 6% in 2019 to 19% nationwide. According to the Ember report, titled Plugging storage into India’s rooftop solar revolution, 10 Indian states hold over 85% of the national rooftop solar capacity, with Gujarat and Maharashtra leading the sector through massive numbers. Other top states include Uttar Pradesh, Rajasthan, Kerala, Tamil Nadu, Haryana, Madhya Pradesh, Karnataka and Andhra Pradesh.

The Ember report highlights that a targeted battery subsidy delivered through the ‘PM Surya Ghar: Muft Bijli Yojana’ scheme can turn the home solar boom into a local power resource. The scheme is a Government of India initiative launched in 2024 to provide free electricity up to 300 units per month for 10 million households through rooftop solar installations.

Homes typically use less electricity during the day and draw peak power after sunset. As a result, those equipped with rooftop solar panels send large amounts of solar power back to the local grid during daytime. System operators find these exports hard to predict or control. At scale, they create voltage challenges and steep evening spikes for power companies. Ember’s research says managing these surges requires quick local action. Adding storage addresses the mismatch between when homes generate power and when they use it.  

Battery storage captures excess daytime electricity and stores it for evening use. However, Ember says that current rules remove financial incentives for household storage investments. This policy mismatch discourages families from buying home batteries.

According to Ember, home users now account for half of India's rooftop solar capacity and under PM Surya Ghar, home capacity reached 14.9GW across five million households by July 2026. Adding a 5kWh battery to a 3kW rooftop system cuts daytime solar power transfers by 85–90%, based on the Ember findings. This reduction relieves daytime pressure on local power transformers and lines. Voltage stability improves greatly across residential power loops.

Despite technical benefits, current costs discourage battery adoption. High upfront costs stop average homeowners from buying storage. Without subsidies, adding a battery stretches a household payback period from around 3.3 years for solar alone to over nine years. A 50% subsidy for battery storage under PM Surya Ghar changes this math, as highlighted by Ember. The subsidy brings the household payback period back down to under seven years.  

To prevent these financial hurdles from stalling adoption, policy frameworks must also address wider network pressures. Unmanaged daytime exports risk local overvoltage issues and waste renewable power, as power networks experience reverse power flows which older transformers handle poorly, the Ember report points out. Without local storage, engineering teams face costly upgrades to local grid equipment just to handle extra solar power.

Aligning consumer costs with wider power systems requires phased policy changes. Metering rules need updates to reflect the true value of electricity at different times, prompting regulators to design new settlement rules that protect local network health.

Ember adds that time-of-day tariffs would reward households for storing or using electricity locally during peak solar hours. The authors report that price signals encourage behavioural changes among residents, while financial incentives guide electricity use toward better times for the system.

Moving to managed flexibility requires close teamwork among federal ministries, state regulators and power utilities. Ember suggests that subsidy distribution costs must stay low to keep consumers engaged and ensure smooth programme execution. Banks must also develop special loan products covering both solar panels and battery storage units. Low-interest green financing can bridge the affordability gap for middle-income households, enabling commercial banks to expand lending for local renewable assets.

In addition, Ember recommends setting up monitoring tools to track live battery use and drops in grid exports across participating states. Data transparency allows regulators to adjust subsidy structures as needed, with continuous data collection guiding future policy changes.

India's rooftop solar revolution proves consumer-led energy transitions can grow fast, Ember’s report concludes. It goes on to argue that adding storage will secure momentum and build a strong foundation for clean electricity, providing a basis for long-term energy planning which depends on flexible local resources.