At 05:05 on Friday 25 September a commissioning test at the newest power plant in Central Asia, 1,573 megawatts of gas-fired capacity at Bayavut in Uzbekistan's Syrdarya region, ended with 1,600 megawatts of generation leaving the grid, by the energy ministry's count, and households and pumps in several Uzbek regions lost power. Within a minute Kazakhstan's grid operator saw the surge, its north-south transit split, and 962 megawatts of load in southern Kazakhstan was shed. Parts of two Bishkek districts stayed dark until 09:24, and Tajikistan's protection systems tripped and steadied its grid in minutes.
Three days earlier, on Tuesday 22 September, the president of Uzbekistan had approved a plan to take his country's generating capacity to 57.2 gigawatts by 2035.
The plan counts what will be built: 46.1 gigawatts by 2030, 57.2 by 2035, 26 storage projects of 4.2 gigawatts, almost 5,000 kilometres of new lines, and a rule that projects follow "the long-term needs of the economy". Friday counted what happens when one of those plants is switched on.
Uzbekistan's grid does not fail alone. It sits in a ring that Soviet planners built as one system for five republics, and the ring is why a test in Syrdarya region cut power in southern Kazakhstan and Bishkek. Turkmenistan left the ring; Tajikistan came back to it; Kazakhstan's south hangs on it, and on a single north-south transit that carries the north's coal power down to the south's cities.
What has changed is the size of the pieces plugged into the ring.
The mechanism has a name in the dispatchers' Russian, a surge of power flow, and it has a record. On 25 January 2022 a sudden imbalance in the Uzbek and Kyrgyz systems threw such a surge onto the same 500-kilovolt transit, which KEGOC then called north-east-south; the automation separated it, about 1,500 megawatts were cut, and Almaty, Shymkent, Taraz and Turkestan, Bishkek and Osh, Tashkent region and the Fergana valley lost power on one morning, in the account KEGOC and the Uzbek energy ministry gave that day.
On 14 August this year two generators at Toktogul in Kyrgyzstan tripped and Kazakhstan's south went dark again. The inquiries multiplied on each side of the border; the joint one existed only in Bishkek's appeals. Friday was the third such morning in less than 5 years, and the second in 6 weeks.
The paradox sits in the plan's own numbers, unstated. A grid's resilience is measured against its largest single failure: the biggest unit that can drop out at once, and what the rest of the system must absorb in the seconds after.
In 2022 the surge that broke the ring cut about 1,500 megawatts of load. On Friday one plant that is not yet in commercial operation dropped 1,600 megawatts of generation, and 962 megawatts of load went with it in Kazakhstan alone. Every plant Uzbekistan adds on the way to 57.2 gigawatts is a candidate for the next largest single failure, and the newest are the biggest, unless the wires, the storage and the dispatch grow with them.
The ring's physics have not changed. What has changed is the size of the pieces plugged into the ring.
The lines and the storage are the plan's answer. Almost 5,000 kilometres of lines and 4.2 gigawatts of storage are the part of it that generates nothing; they are the part that decides whether a trip at dawn stays a trip or becomes a blackout across four countries.
On Friday, Uzbekistan's energy ministry said, reserves at other plants and the storage systems were brought in and every consumer in Uzbekistan was back by 07:27. Storage is the fastest fix the region has, and it is the part of the plan that can arrive first.
The second-order effect is political, and it is already visible in Astana. A country whose southern cities can be switched off by a test across the border does not stay in the ring for love of the Soviet map. It stays because leaving costs more: new north-south lines, new generation in the south, or a fence at the border that turns a shared reserve into a national one.
Every dawn trip makes the fence cheaper to argue for and the ring harder to defend, in Astana first and in Bishkek after it.
Five years is enough time for the argument to be settled either way. In one direction, the region treats the ring as the asset it is: a common reserve larger than any national one, run by a dispatch centre trusted with real authority to cut load in one country to save another, with storage placed where the surges hit and a market that pays for reserve as well as for energy.
In the other, each country builds its own margin, Kazakhstan doubles its north-south wires, Uzbekistan keeps its storage for itself, and the ring survives as a set of interconnectors that everyone tries not to lean on. The first is cheaper for the region and dearer for each government's pride; the second is the reverse.
The pieces coming are large. Rogun's third unit is due in Tajikistan in 2027; Kambar-Ata-1, 1,860 megawatts on the Naryn, has three governments and the World Bank at the table; Uzbekistan's 57.2 gigawatts include plants the size of Bayavut and larger.
Each will be tested, as Bayavut was, at the hour when the load is lowest and a trip hurts least. Each test asks the ring what Friday asked.
The plan answers how much capacity Uzbekistan will have in 2030 and 2035. It does not say who decides, once the automation has separated the transit in the first second, which city stays dark for the next hour so that the others do not, or whether that person sits in Tashkent, Astana or nowhere at all.