Mumbai builds its smart layer under duress. A court order forced sensors onto its construction sites; an arbitration ended its attempt to map and meter the water network; a blackout sent its forty-year-old grid-islanding scheme back to the drawing board. What the city has delivered by choice tends to arrive complete and then wait for demand — a fully underground metro carrying a twentieth of its forecast, a single ticket for eleven operators that still does not cover the commuter rail most people actually use.
The atlas documents 7 projects in Mumbai, the earliest dating to 1981: 1 documented failure, 6 still running without a verdict. Every entry carries an evidence grade — the strongest here is independent (1 entry) — and links its sources.
Three entries that show what Mumbai is actually doing.
Computed from the 7 entries below — a profile, not a score.
Mumbai's oldest entry here predates the vocabulary. Since 1981 the city has run a grid islanding scheme: automatic relays that cut Mumbai loose from Maharashtra's transmission network when a disturbance arrives outside, leaving generation inside the city to carry the load. On the utilities' own count it rode out 27 of 37 major disturbances. It is engineering of a kind Mumbai has always been good at — physical, autonomous, unglamorous — and it belongs to a city whose civic body, the BMC, is among the wealthiest in India.
The instrumentation attempts that followed have a harder record. In 2014 the corporation hired a contractor under a 275 crore rupee programme to GIS-map a water network nobody had properly documented, split it into metered zones and move two wards to round-the-clock supply. By the July 2019 deadline the national audit found 18.6 per cent of the contract value executed; the contractor went to arbitration and the city wound the programme up in 2021. Then on 12 October 2020 the islanding scheme itself failed in public: the island separated as designed but collapsed within minutes, roughly 1,394 MW of local generation against more than 2,800 MW of demand, and parts of Mumbai stayed dark for up to fifteen hours. India's power minister blamed human error; the state's energy minister blamed a cyberattack; the security firm whose report started that theory said the link was unsubstantiated.
What the city has built since divides into two kinds. There is what it chose: electrifying the BEST bus fleet from 2017, the climate action plan of March 2022 — India's first with a net-zero target, and since 2024 the first city budget tagged against one — the Aqua Line, India's first fully underground metro, opened in stages from October 2024, and the Mumbai One app of October 2025, one QR ticket across eleven operators. And there is what it was made to build: since a Bombay High Court order in January 2025, every active construction site must run its own dust sensors, show the readings on a board and stream them to the municipal command centre.
The gap between capability and use is the through-line. The Aqua Line's signalling covers unattended train operation, but MMRC has kept drivers aboard pending safety clearance, and over its first 136 days the opened section carried under 20,000 riders a day against a 400,000 forecast. Mumbai One integrates eleven operators but not suburban season passes, which moved to a separate railway app in March 2026. The climate department created to run the plan had four of its 41 posts filled in June 2025, while the same corporation won permission that December to fell about 45,675 mangroves for a road. And in its December 2025 affidavit to the court, the BMC reported that 662 of roughly 1,954 active construction sites still had no working monitor.
On a time axis, by the year each one started — 1981 to 2025. Pick a dot to read what it was.
✔ Every published entry is checked against the public sources it cites before publication.
Editorial links between Mumbai's own entries — the city as a system, not a list.
Plans and announced trajectories — not yet documented results.
Mumbai is the city in this atlas where the honest answer is thinnest, and the reason is worth stating: not that little is happening, but that little of it can be verified. Four candidates researched for this entry were held back — the climate plan's own tracking portal, the flood-warning system, the police camera network and the traffic-control system all failed either a currency check or a sourcing check, because the municipal, police and ministry portals that would confirm them are unreachable while the numbers in circulation come from vendor blogs and aggregators. That is a finding about Mumbai's transparency, not only about our reach. Where independent scrutiny does exist, it has been decisive: a national audit ended the water programme, a peer-reviewed reconstruction explained the blackout, and a court is the reason dust sensors exist at all. The near-term question is whether the court-supervised enforcement outlasts the court's attention, and whether the metro finds the riders it was built for.
Where Mumbai appears in the atlas's own analysis.
Three cities the atlas reads next to Mumbai — the reason first, then the entries it rests on. Chosen by hand from the Mumbai threads below, not counted out of them.
India's two biggest builders working the same problems from opposite ends: Delhi regulates a whole airshed from one index, Mumbai meters each building site — and both opened metros billed as driverless that kept a driver aboard.
The same three problems, two Indian answers: Mumbai chased its lost water through one big contract that collapsed, Bengaluru went after the demand instead — and both opened metro lines rated to run unattended with a driver still aboard.
The same generation of CBTC line and the opposite fate of the same water contract: Mumbai's leak programme collapsed a fifth of the way in, Ho Chi Minh City's is the counter-case that kept going.
Every editorial link from Mumbai's entries into another city, strongest first. Each one is a statement about two projects, not about two cities — the three above are the ones the atlas is willing to make at city level.
1001 Smart Cities (2026). “Smart-city projects in Mumbai, India.” The Smart City Atlas. https://1001smartcities.org/cities/mumbai/ (last verified 2026-07-26). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.