From the first suburban train before dawn to the last office tower lit after midnight, Mumbai is in constant motion. Millions of people rely on its transport, hospitals, industries and businesses every hour of every day.
It is a city built on one simple expectation - that everything keeps moving.
Local trains begin carrying millions before most cities have had breakfast.
Every trading day, decisions made here ripple through businesses across the country.
The region was running dangerously close to its limits. Power demand surged while the infrastructure carrying electricity into the city struggled to keep up.
Mumbai consumes between 3,500 and 4,000 MW of electricity during peak demand.
But the four existing 400 kV lines feeding the city were already nearing their limit — together capable of delivering only about 2,600 MW safely.
Only about 1,800 MW is generated inside the city itself.
For a city that powers, India’s largest financial institutions, its busiest port systems, a rapidly growing data-center ecosystem, this vulnerability was unacceptable.
On 12 October 2020, Mumbai came to a standstill.
Local trains halted between stations. Traffic signals failed. Hospitals switched Covid wards to diesel generators. High-rise buildings lost water pumps. Businesses, homes and essential services all discovered the same thing at once: a modern city only works when electricity never stops.
Businesses, homes and essential services plunged into darkness
Local trains halted between stations
Mumbai didn't run out of electricity.
It ran out of ways to deliver it.
Mumbai's energy demand kept climbing faster than forecasts.
By 2024, peak demand crossed 4,300 MW—two years earlier than expected. Yet the city's ability to import electricity had barely changed.
The consequences reached far beyond reliability.
Without enough transmission capacity, utilities depended on older, more expensive generating stations located within the city. That translated into some of India's highest electricity tariffs.
It also limited Mumbai's clean-energy future.
Most renewable power is generated hundreds of kilometres away. Without long-distance transmission lines, affordable solar and wind energy simply cannot reach the city.
The answer became Mumbai Urja Marg—three high-capacity transmission corridors designed to strengthen Mumbai's connection to the national grid.
Nearly every tower location required negotiations, approvals or redesign.
Land prices had also risen far beyond the government compensation rates used for infrastructure projects. In many locations, the official valuation no longer reflected reality.
Over four years, Resonia faced very different forms of resistance.
Rather than applying one solution everywhere, every situation was approached differently.
Ambernath
old market rates
Residents challenged outdated compensation rates in court.
Instead of treating them as opponents, Resonia worked with the government to revise the compensation framework itself.
Once market-linked rates were introduced, the dispute ended.
PANVEL
broken trust
Communities had lost trust after earlier infrastructure projects.
Rather than holding large public meetings, teams identified actual landowners, verified records and built relationships one family at a time.
Trust returned through transparency.
chindran
the hunger strike
Villagers wanted the route shifted away from private land. Resonia kept the approved alignment intact but introduced a technically viable diversion that addressed their main concern.
The compromise added three towers—but unlocked construction.
Developer Corridor
township planning
A major township developer opposed several tower locations.
After months of discussion, government agencies facilitated a joint redesign that allowed both the township and the transmission corridor to coexist.
Parts of the transmission route run through hilly terrain and forested areas where road access is limited. Moving heavy construction material to tower locations could have required building temporary roads — an approach that would slow the project and disrupt local ecosystems.
Helicopters were used to airlift materials directly to tower locations, reducing construction time and avoiding ground disruption.
Each flight carried heavy loads — steel, cement, sand — directly to remote locations that would otherwise take hours to reach.
flying hours
professional operators
tonnes of steel towers, cement, sand and water
tonnes of material
For the construction teams working in extreme temperatures, it also meant avoiding long transport routes and reducing the time taken for the build.
Narrow-base towers allowed longer spans between foundations, reducing the number of private properties affected.
In one urban corridor, 22 monopoles were even placed along the median of a planned road—sharing existing infrastructure instead of consuming new land.
Rather than cutting new roads through forests, helicopters transported nearly 880 tonnes of material directly to construction sites.
Mumbai Urja Marg became operational in September 2024.
Import capacity into Mumbai has more than tripled.
Around 1,800 MW of additional power flows into the region.
A major substation, idle for more than a decade, is finally connected.
The grid can now withstand the loss of a major transmission corridor without triggering a city-wide blackout.
The impact extends beyond reliability.
