Two operators printed two sizes for one loss, 1,600 MW in Tashkent and 1,516 in Astana, and 2 clocks 3 minutes apart, and both are the same event read from either end of a line. The plant is on test: a combined-cycle station of 1,573 MW still in commissioning, tripping during its tests, which is what commissioning is for; the grid it tripped on is the Central Asian ring, in which Uzbekistan, Kazakhstan’s south and Kyrgyzstan hang on the same frequency and Kazakhstan’s north feeds them through one transit. The surge crossed the border faster than any statement did.
Central Asia learned the mechanism on 25 January 2022, when a fault on that transit blacked out Tashkent, Almaty and Bishkek in a morning: a large block of generation falls out, the frequency drops, the flow from the north surges to fill the hole, the protection splits the transit to save the northern system, and the south is left to shed load. This time the split held 41 minutes, the shedding was 962 MW, and Uzbekistan’s restoration ran 2 hours and 22 minutes on other plants’ reserves and on the storage systems, the ministry’s phrase for the batteries it has been installing.
The surge crossed the border faster than any statement did.
What the morning measured is the size of the new plant against the ring that has to absorb it. A 1,600 MW unit removed at once by a test is the ring’s stress test as much as the plant’s; the ministry’s apology went to households and to farm pumps, the 2 loads that run at 5 in the morning in September. KEGOC’s transit split is the same mechanism as in 2022, and the answer it implies has not changed: more transit capacity, more reserve on the southern side, more batteries. The batteries were there this time. The transit was not.