ANOOP SAXENA
NEW DELHI: In the labyrinthine lanes of Dharavi, where the skyline was once a chaotic mesh of tangled electrical wires and ‘hooking’ cables, a new architecture is rising. The rusted corrugated tin roofs that define Mumbai’s informal settlements are disappearing beneath a sleek, blue-black armour of solar panels.
Meet Abdul Sheikh, a 42-year-old tailor, whose family has lived here for three generations. For decades, his biggest overhead wasn’t the price of silk or the maintenance of his sewing machines; it was the unpredictable, spiralling cost of electricity. Today, Abdul isn’t just a consumer; he is a ‘prosumer’. Thanks to the massive push of the PM Surya Ghar: Muft Bijli Yojana, Abdul’s roof has been transformed into a miniature power plant.
“Last month, my bill was negative Rs 450,” Abdul says, gesturing to the bi-directional net meter installed outside his workshop. “I didn’t just get free light; the grid bought electricity from me,” he says with pride.
A policy masterclass
India’s journey to United Nation’s Sustainable Development Goal (SDG) 7, i.e., Affordable and Clean Energy, took a radical, decentralised turn in late 2024. While the massive solar parks of Rajasthan and Gujarat grabbed global headlines for years, the real revolution is now happening on the ‘last-mile’ rooftops of urban India.
As of March 2026, India has added a record 22GW of residential rooftop solar in just 24 months. To put that in perspective, that is roughly equivalent to the entire power generation capacity of several small European nations combined, all harvested from the tops of homes, shops, and small factories.
The catalyst for this explosion was the ‘saturate and subsidise’ model. Unlike previous iterations that were bogged down by red tape, the 2024-25 policy shift offered a staggering 60 per cent direct subsidy for low-income households for systems up to 2kW.
But the real ‘secret sauce’ was the solar aggregator framework. These are nimble startups that lease roof space from residents, install the panels at zero upfront cost, and share the revenue from the power sold back to the distribution companies (discoms).
Virtual power plant
The story of the ‘grid flippers’ isn’t just about individual homes; it’s about the power of the collective. In the Sion-Dharavi belt, the Sion Solar Cooperative has turned a block of ten chawls into India’s first urban virtual power plant.
As of March 2026, India has added a record 22GW of residential rooftop solar in just 24 months, which is roughly equivalent to the entire power generation capacity of several small European nations combined
By linking 200 individual rooftop systems via a smart AI-driven micro-grid, the cooperative provides a steady, aggregated stream of 500kW to Mumbai’s main grid during the punishing peak afternoon hours.
When the city’s air conditioners are humming at full blast, it is the sunlight captured on the roofs of the poor that is keeping the high-rises of South Mumbai from facing blackouts.
“This is the ultimate democratisation of energy,” says Dr. Ananya Sen, an urban economist. “For a century, power flowed from massive, central plants to the people. Now, the people are the plant. When a low-income family saves Rs 2,000 a month on electricity, that money goes directly into better nutrition, healthcare, or school fees. It’s a silent, massive wealth transfer from the sun to the pocket of the common man.”
The grid challenge
However, this sun-kissed dream has introduced a new, high-stakes technical challenge for the country’s power engineers – the ‘duck curve’. During the day, when solar generation is at its peak, the demand for traditional coal-powered electricity drops precipitously. But as the sun sets and millions of people turn on their lights and stoves, the demand ramps up with a vertical intensity that can strain even the most robust grids.
In North Indian cities like Ghaziabad and Noida, residents have begun reporting ‘voltage jitters’. The local distribution transformers, many of them decades old, were not designed to handle power flowing backward from homes into the substation.
“We are essentially asking a one-way street to suddenly become a high-speed two-way highway,” explains Vikram Singh, a senior grid manager. “The solution lies in BESS (Battery Energy Storage Systems). We need to store that mid-day sun to use it at 8:00 PM.”
‘Silicon Valley’ of slums
The economic ripple effect of this transition is creating a new class of ‘green-collar’ workers. In the narrow alleys where mobile repair shops used to be the primary tech hub, ‘solar care’ clinics are popping up.
Cleaning a solar panel might sound simple, but in India’s dust-heavy atmosphere, soiling can reduce energy efficiency by up to 30 per cent in a single week. This has birthed a micro-entrepreneurship boom.
Small teams of “Suryamitras” (Friends of the Sun) now roam neighborhoods with specialised telescopic brushes and de-ionised water sprays, charging a nominal fee of Rs 50 per panel per month.
Beyond the economics, there is a profound environmental victory. Dense urban areas like Mumbai and Delhi suffer from the ‘urban heat island’ effect – where concrete and asphalt trap heat, making cities up to 5°C hotter than the surrounding countryside.
New studies from the IIT-Bombay Climate Hub (2026) suggest that the massive installation of rooftop solar is having a ‘shading effect’. By intercepting the sun’s rays before they hit the concrete roofs, solar panels are naturally cooling the top floors of buildings by 3-4°C.
As India marches toward the 2030 SDG deadline, the ‘grid flippers’ of 2026 are providing a blueprint for the Global South. The model proves that green energy doesn’t have to be a luxury for the elite; it can be a survival tool for the marginalised.
SDG 7 Affordable and clean energy
This UN goal aims to "ensure access to affordable, reliable, sustainable and modern energy for all" by 2030. It focuses on universal electricity access, increasing the share of renewable energy, and doubling energy efficiency improvements, along with expanding infrastructure in developing countries.
