Busbar fault at Insukamini substation triggers nationwide blackout in Zimbabwe
Jan 2024Published 15 Sept 2026Responsible editor: Chief Editor
- Where
- Insukamini 330kV substation, Bulawayo, Zimbabwe
- Operator
- ZETDC, part of ZESA
- What
- Busbar fault triggered system surge and nationwide blackout
- Cause
- Busbar fault at the Insukamini 330kV substation
- Outcome
- Power restored to most parts; full restoration continuing
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Companies named in the reporting of this entry (being named is not a finding of fault): Zimbabwe Electricity Transmission
What happened
On the morning of 4 January 2024, the Zimbabwe Electricity Transmission and Distribution Company (ZETDC), part of the Zimbabwe Electricity Supply Authority (ZESA), reported a system surge on the national grid at 05:22, triggered by a busbar fault at the Insukamini 330kV substation in Bulawayo. The fault caused a loss of power across the whole country. ZESA stated that technical teams were dispatched to the site and that power was subsequently restored to most parts of the country, with full restoration work continuing.
The incident occurred against a backdrop of pre-existing power shortages in Zimbabwe, where peak demand of around 1,850 MW exceeds available generation capacity of below 1,200 MW from major stations, exacerbated by ageing equipment, reduced hydro output and coal supply issues.
Contributing factors
The stated cause was a busbar fault at the Insukamini 330kV substation, which triggered a system surge across the national grid. The report also notes broader systemic vulnerabilities in Zimbabwe's electricity supply, including ageing power station equipment and constrained generation capacity, though these were not identified as direct causes of the substation fault itself.
Lessons learned
- A busbar fault at a 330kV substation can trigger a system surge and total national blackout, so operators must verify protection settings and redundancy at critical nodes.
- Technical teams must reach high-voltage substations quickly after a fault to limit outage duration on stressed grids.
More lessons on electrical protection and isolation, outages, backup supply and restoration, from every incident on the register.
Not yet known
- Exact cause of the busbar fault
- Duration of full power restoration
- Cost of damage and lost supply
This entry is updated when these are reported. Get an alert for the next one like it.
Source
Published 2026-09-15. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.
