After a temporary malfunction that cut generation, the eighth boiler at TPP-4 has been repaired and the plant has returned to full operation, officials said.
A fault affecting TPP-4’s eighth boiler, combined with coal freezing on the feeder side at the Buuruljuut power plant, previously reduced generation capacity, reportedly dropping output from 300 MW to 120 MW and prompting two days of electricity restrictions in Ulaanbaatar.
As of January 21, 2026, the repair work on the eighth boiler was completed and TPP-4 is now operating at its rated capacity of 670 MW. All turbines and generators are running at full output, authorities said.
Officials warned the public that the plant has limited backup equipment and that any new damage to the aging facility could again force supply restrictions. The eighth boiler’s repair had originally been scheduled for summer 2026.
After a temporary malfunction that cut generation, the eighth boiler at TPP-4 has been repaired and the plant has returned to full operation, officials said.
A fault affecting TPP-4’s eighth boiler, combined with coal freezing on the feeder side at the Buuruljuut power plant, previously reduced generation capacity, reportedly dropping output from 300 MW to 120 MW and prompting two days of electricity restrictions in Ulaanbaatar.
As of January 21, 2026, the repair work on the eighth boiler was completed and TPP-4 is now operating at its rated capacity of 670 MW. All turbines and generators are running at full output, authorities said.
Officials warned the public that the plant has limited backup equipment and that any new damage to the aging facility could again force supply restrictions. The eighth boiler’s repair had originally been scheduled for summer 2026.