At thirteen seconds past one on the afternoon of Tuesday, 31 July 2012, a relay at Bina, in Madhya Pradesh, sees what looks like a fault. It guards the Bina end of a 400-kilovolt line that runs north to Gwalior and on to Agra. It is set to trip when current is high and voltage low together, which is how a short circuit announces itself. The line is carrying 1,254 megavolt-amperes, and the voltage at Bina has slumped to 362 kilovolts.
There is no short circuit. The recorders show no fault and no swing on the line, and the enquiry committee later names what the relay has mistaken: “load encroachment”, a line so heavily loaded that it looks, to a relay, like a line in trouble. The relay trips, as its settings tell it to.
One line should not matter this much. Its twin, Bina–Gwalior 2, has been out of service since 27 July. Other lines in the corridor are out as well. Two minutes before, at 12:58, two smaller lines at Badod tripped on overload, after a 250-megawatt unit at Suratgarh in Rajasthan went off the system at about 12:50. By the committee’s account, this one circuit is, in effect, the only main alternating-current link left between the western grid and the northern. At half past twelve the north was generating 29,884 megawatts and demanding 33,945, and the missing 4,061 was being imported.
The relay opens. The north comes loose from the west. Power now tries to reach it the long way round, through the east, and the network begins to swing. By the time the swing has run its course, the northern, eastern and north-eastern grids are down, and the Ministry of Power’s own report puts the load affected at about 48,000 megawatts.
It was the second collapse in two days. The northern grid had failed at 02:33 on Monday, 30 July, with 36,000 megawatts of load on it, and the first cause was the same: the same line, tripped by the same relay setting, with no fault on it. That morning the Union power minister, Sushilkumar Shinde, told the BBC he had been informed at 5.30, and appointed a committee to report in a fortnight.
The mechanism is worth stating plainly, because it recurs. When the Bina line opens, the northern load does not vanish. It is met by power taking the long route from west to east to north, and that route is too long to carry it steadily. The machines in the north begin to slow against those in the rest of the grid, and the angle between the two sides keeps growing until lines trip along the seam. On 30 July the north was cut off and collapsed on falling frequency. On 31 July the centre of the swing lay in the east, so the east went down too, and then the north-east. A few pockets survived on both days, among them three units at Delhi’s Badarpur station, with about 250 megawatts of load.
- 1400 kV Bina–Gwalior–Agra · one circuit. The relay at Bina opens it.
- 2Its twin: second circuit out since 11:47, 28 July, for upgrade to 765 kV.
- 3South: linked, not yet synchronised.
- 4≈13:01:32 · north cut off from east.
- 5North, already failed once, 02:33, 30 July.
≈48,000 MW of load lost
≈620 million people
One heavily loaded line tripped, and three of India's five grids went dark
A schematic, not a map; line thickness in 2012 is illustrative. With one circuit of the Bina–Gwalior–Agra line out for an upgrade, the other was in effect the only main AC link from west to north. When it tripped, the north, east and north-east collapsed and the west and south survived. Switch to see the single national grid that followed.
Source: Report of the Enquiry Committee on the grid disturbances of 30 and 31 July 2012; AP; PIB power-sector fact sheet (February 2025); Business Today
See the numbers
| When | What happened | Figure |
|---|---|---|
| 28 Jul 2012, 11:47 | One circuit of the 400 kV Bina–Gwalior–Agra line taken out for upgrade to 765 kV | |
| 30 Jul 2012, 02:33 | Northern grid collapses | ≈36,000 MW load |
| 30 Jul 2012, 16:00 | Northern grid restoration completed | |
| 31 Jul 2012, 13:00:13 | 400 kV Bina–Gwalior line trips at Bina on zone-3 protection; no fault on the system | 362 kV at Bina end |
| 31 Jul 2012, ≈13:03 | Northern, eastern and north-eastern grids collapse; western and southern survive | ≈48,000 MW load; ≈620 million people |
| 31 Jul 2012 | Major part restored: north ≈5 h, east ≈8 h, north-east ≈2 h | |
| 31 Dec 2013, 20:25 | 765 kV Raichur–Sholapur line synchronises the southern grid with the rest | |
| 2013–14 | Inter-regional transfer capacity | 36 GW |
| 2024–25 | Inter-regional transfer capacity | 119 GW |
By the BBC’s count, around 600 million people lost power on 31 July, in 20 of India’s 28 states. The Guardian, counting everyone who lived in the affected area, said more than 700 million. It was a blackout the Guardian ranked among the world’s worst. Hundreds of trains stopped, from Kashmir to Nagaland. Surgeries were cancelled, and at one hospital outside Delhi nurses ran life-saving equipment by hand when the generators failed. Some electric crematoriums stopped mid-cremation.
The Delhi Metro halted at lunchtime. The committee noted that at any moment about ten of its trains are inside tunnels. If the supply fails, batteries keep the lights and fans running for about half an hour, and the doors cannot be opened. On 30 July the Metro had been spared, because the first collapse came when the trains were not running. Around 200 miners in West Bengal were trapped underground when the lifts failed. All the state’s government workers were sent home after the chief minister said power would take ten to twelve hours to return.
On the day of the second collapse, the government announced that Shinde was being promoted to home minister. The power portfolio passed to the corporate-affairs minister, who already had a job. Shinde’s own explanation, given that day, was that the states had been taking more than their share.
A blackout counts only those who had power to lose. In 2012, by the World Bank’s count, 79.9 percent of Indians had access to electricity. For China the figure was 99.9. About one Indian in five lived outside the grid, and about one Chinese in a thousand.
In 2012 one Indian in five had no electricity at all; by 2024 almost everyone had a connection
Share of the population with access to electricity. The line counts connections, not hours of supply, which is why the 2018 milestone and the outages that followed can both be true.
Source: World Bank, World Development Indicators (EG.ELC.ACCS.ZS), fetched 21 October 2026; CEEW, State of Electricity Access in India (2020)
See the numbers
| Year | India (% with access) | China (% with access) |
|---|---|---|
| 2000 | 60.3 | 96.7 |
| 2001 | 62.0 | 97.0 |
| 2002 | 62.3 | 97.2 |
| 2003 | 65.4 | 97.4 |
| 2004 | 64.4 | 97.7 |
| 2005 | 68.8 | 97.9 |
| 2006 | 67.9 | 98.2 |
| 2007 | 72.3 | 98.5 |
| 2008 | 74.1 | 98.8 |
| 2009 | 75.0 | 99.1 |
| 2010 | 76.3 | 99.7 |
| 2011 | 79.5 | 99.9 |
| 2012 | 79.9 | 99.9 |
| 2013 | 83.1 | 100.0 |
| 2014 | 85.1 | 100.0 |
| 2015 | 88.0 | 100.0 |
| 2016 | 89.6 | 100.0 |
| 2017 | 91.8 | 100.0 |
| 2018 | 95.7 | 100.0 |
| 2019 | 95.9 | 100.0 |
| 2020 | 96.5 | 100.0 |
| 2021 | 99.6 | 100.0 |
| 2022 | 99.2 | 100.0 |
| 2023 | 99.5 | 100.0 |
| 2024 | 99.9 | 100.0 |
Power is the floor under every step of the staircase. A shoe factory can work around a bad road. It cannot work in the dark, and a factory that cannot trust the grid must buy a generator and pay for its power twice.
That floor gave way in layers, and the committee wrote the layers down. At the top was the corridor, weakened by planned and forced outages at the same moment. Below it lay discipline: some northern utilities drew more than their schedule, and the state control rooms did not respond adequately to the instructions to cut it. On the morning of 30 July the northern states had been told to shed load to relieve the line, and the committee judged the load they shed “insignificant”.
The committee’s list of what might have saved the system is a list of dull things. Outages of lines should be planned together, so that several are not taken out at once while the corridors between regions are depleted. Generators should respond automatically to a falling frequency, and utilities should shed load automatically when it drops. Control rooms should have faster tools for seeing the state of the grid, and relays should stop tripping healthy lines that are merely heavily loaded. It asked for a review of Unscheduled Interchange, the charge a utility pays for drawing more or less than its schedule, which had been brought in during the early 1990s to impose discipline on a grid whose frequency had wandered between 48 and 51.5 hertz. And it said, in plain words, that the present mechanism was sometimes endangering the grid. It also recommended that the penal provisions of the Electricity Act of 2003 be reviewed, so that the instructions of the load despatch centres were better obeyed.
Restoration was slow for its own reasons. On 30 July the northern grid was restored by four in the afternoon. On 31 July the committee heard that most of the north came back in about five hours, the east in eight and the north-east in two. It observed that on both days some generating units took unduly long to restart once start-up power was available. It also looked into the rumour of an attack, and found no evidence of a cyber attack on either day. That leaves a failure with no enemy in it, which is harder to fix than one with an enemy: the committee asked for islanding schemes for essential services such as railways and the Delhi Metro, for more autonomy for the load despatch centres, and for proper telemetry before any new line or generator is commissioned.
Cutting load in a hot July means switching off customers. Below the control room sits the money.
The route from a farmer’s pump to a blackout is long, and it passes through one state’s tariff. In 1988 Gujarat gave its farmers a flat tariff, charged by the horsepower of the pump, not by the unit of power used. The tariff was not revised on time, and farmers installed more tube wells. Demand for electricity from farms rose sharply, and the state’s distribution companies were in severe financial stress. Gujarat answered by rationing, and before 2001 it supplied rural areas for twelve to fourteen hours a day.
Its way out was to separate the wires. The Jyotigram scheme, announced in 2006, gave villages a 24-hour three-phase supply and gave farmers their own feeder lines, so the farm load could be limited without darkening the village. In 2011 the Government of India accepted it as a flagship scheme for the Twelfth Plan.
Elsewhere, politics went through the meter. The political scientists Brian Min and Miriam Golden studied four decades of annual data from Uttar Pradesh, India’s most populous state, and ten years of local data. They found that electricity supplied but never billed tends to rise before state assembly elections, peaking just before the 2002 and 2007 polls. Where the losses grew, the party in power was more likely to keep the seat. Their reading is that parties steer scarce power towards flat-rate and unbilled users. It is the bread-or-freedom question of Chapter 9 run down a single wire: a farmer who needs his pump, a politician who needs the farmer and a utility that cannot refuse either.
In 2013–14 the distribution companies lost 22.62 percent of the power they handled, to leaky wires, theft and unpaid bills; the technical name for it is aggregate technical and commercial loss. In the same year the sector as a whole lost Rs 67,962 crore.
2013Sriperumbudur, Tamil NaduSix months later, in January 2013, income-tax officials carried out a survey at Nokia’s handset factory at Sriperumbudur, near Chennai, and at its offices in Gurgaon. The plant employed more than 9,000 people, 55 percent of them women. On 31 January an interim report said the company should pay Rs 13,000 crore, Rs 3,000 crore of it tax and Rs 10,000 crore over transfer pricing. Nokia said it was cooperating. The figure was the department’s claim, not a court’s finding. A later chapter returns to what India had to change before it could assemble phones at scale. This chapter is only about the floor.
2013In May 2013 the United States Federal Reserve signalled that it would taper its asset purchases, and money began to leave emerging markets. On 28 August the rupee fell to 68.36 to the dollar. The current-account deficit had been 4.7 percent of GDP in 2012–13.
The repair was fast and it came from officials with room to act. The Reserve Bank opened a swap window for banks’ foreign-currency deposits and overseas borrowing, which mobilised $34 billion. By 2013–14 the deficit had fallen to 1.7 percent of GDP. In 1991 the country had pawned its gold (Chapter 10); in 2013 it taxed gold imports at up to 10 percent to defend its reserves. The repair of the money took months. The repair of the wires, as the next pages show, took years.
2013BeijingAcross the border, the Communist Party’s Central Committee closed its third plenum on 12 November 2013, and three days later published a 60-point decision. It said the market should play a “decisive” role in allocating resources, where the phrase until then had been “basic”. Arthur Kroeber, writing for Brookings, thought the change potentially significant, because capital, energy and land were still allocated by the government, to well-connected state actors, at low prices. He warned that the state-enterprise complex would remain. Energy was still a price the state set. The next paragraphs show what that could cost.
China has had its own dark nights, and they have a different shape. In late September 2021, the BBC reported, China was short of electricity, and power cuts hit homes and businesses in Guangdong in the south and in Heilongjiang, Jilin and Liaoning in the north-east. Demand for Chinese goods was surging as the world reopened. Rules imposed from Beijing as it sought carbon neutrality by 2060 had slowed coal production, while coal still gave more than half of the country’s power. And with the government strictly controlling electricity prices, coal-fired plants were unwilling to run at a loss. Goldman Sachs estimated that as much as 44 percent of industrial activity had been affected, and cut its growth forecast for 2021 from 8.2 to 7.8 percent.
In August 2022 it happened again, from another cause. Sichuan relies on dams for about 80 percent of its electricity, and that summer the rivers dried up. The provincial government chose to protect homes, and ordered industrial users in 19 of the province’s 21 cities to suspend production. A Foxconn plant in the province stopped work, according to Taiwan’s Central News Agency.
Notice the shape of the failures. India’s blackout came from below, from many hands each drawing a little more than its share, with the control rooms not stopping them in time. China’s came from above, from a price held down by the state and a province deciding who would go without. The remedies differ too: the Indian committee asked for penalties and tools for the control rooms; the Chinese cuts followed a price and a ruling that a state had set.
India’s answer to 2012 was quieter, and it held. On 31 December 2013 a 765-kilovolt line between Raichur and Sholapur tied the southern grid to the rest of the country. The Press Information Bureau’s phrase for the result was “One Nation, One Grid, One Frequency”. The second line was completed on 30 June 2014, and with both in service the ministry counted a single synchronous grid of 249 gigawatts, among the largest in the world.
Then the villages. On 27 April 2018, between five and six in the evening, the switch was flicked on in Leisang, a hamlet in the hills of Manipur, and a bulb hanging from the village chief’s porch came on. The government counted it as the last unelectrified village in the country. It lies just over 80 kilometres from Imphal, and its last three kilometres are a steep climb over a rocky path that a bike or a person on foot can manage. Thirteen Kuki families, 70 people, live there, with no school or health facility. The village chief said that every other village in the neighbourhood had been connected in 2017, and that when Leisang asked, it was told it was “not in the plan”.
A year later the BBC’s Geeta Pandey found the supply erratic. On a good day the village had five to six hours of power, a small fault took at least three days to mend, and once it had gone dark for three months because the repair team could not reach it. A senior Manipur power official confirmed the three-month outage, and disputed that the supply was only six hours.
The wires reached everyone, in the end, but a wire is not a supply. Burlig and Preonas studied the national programme, RGGVY, which reached over 400,000 villages. It meaningfully expanded access to electricity. But they found it generated limited economic impacts after three to five years. In small villages the programme reduced welfare; in large villages the authors estimate a 33 percent internal rate of return.
The other change was in the books of the distribution companies. By 2024–25, losses to theft, unpaid bills and technical waste had fallen to 15.04 percent, and the sector’s profit after tax, in a first, turned positive: Rs 2,701 crore, against a loss of Rs 67,962 crore in 2013–14. But the accumulated losses of the distribution companies rose, from Rs 5.5 lakh crore in 2020–21 to Rs 6.47 lakh crore in 2024–25, and their debt reached Rs 7.26 lakh crore. The Survey ascribes this to tariffs that do not cover costs, state subsidies paid late and the losses themselves. The grid is national now. The bill is still local.
Demand then did what demand does. On 21 May 2026 India met a record peak of 270.82 gigawatts, in a heatwave, when the country was cooling itself.
In 2025 China added solar capacity equal to more than half of India's entire power system
Areas are proportional to installed generating capacity: what a system could produce at full output, not what it actually produces. China's solar and coal additions are for calendar 2025; India's totals are for 31 March 2014 and July 2026.
Source: China National Energy Administration via pv magazine; Centre for Research on Energy and Clean Air and Global Energy Monitor; Government of India via IANS; PIB
See the numbers
| Country | What | When | Gigawatts |
|---|---|---|---|
| India | Total installed capacity | 31 March 2014 | 249 |
| India | Total installed capacity | July 2026 | 552 |
| China | Solar added in one year | 2025 | 315 |
| China | Coal plants commissioned in one year | 2025 | 78 |
| China | All solar | End of 2025 | 1,200 |
| China | Total installed capacity | End of 2025 | 3,890 |
Remember what failed on that afternoon in July 2012. A relay saw a fault that was not there, on a line that was carrying too much because the lines beside it were out and the states on the end of it were drawing more than they had been scheduled to take. No single decision blacked out half of India; the committee found that no single factor was responsible. Each hand took a little. The floor India has poured since is wider and better monitored, and it still rests on distribution companies that owe more than they earn.
The committee could say what had failed, and it asked for stronger penalties so that the load despatch centres’ instructions would be obeyed. A recommendation is not yet an order carried out, and a state that wants to climb has to be able to make its own instructions stick.