Grid Stability
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Typhoon Champi: Taipower Reports Yilan Residential Supply Restored
Taipower reports that affected residential customers in Yilan were restored by 4 p.m. local time on October 25 after Typhoon Champi. The milestone does not describe island-wide restoration.
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Inside the Control Room: Operator Decisions Before and During the Collapse
Before the April 2025 Iberian blackout, transmission-system operators were managing oscillations, cross-border power transfers and changing voltage conditions. This investigation examines their documented actions, the operational constraints they faced and the difficult interaction between oscillation damping and voltage control.
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Storm Boelo Disrupts Northern Scotland’s Electricity Supply as Restoration Crews Mobilize
SSEN reported just over 47,000 customers awaiting restoration in northern Scotland at 3 p.m. British local time on October 25. Crews, vegetation teams and control-room switching staff are responding to Storm Boelo.
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The Final 90 Seconds: How the Iberian Grid Collapsed
The Iberian blackout unfolded in less than 90 seconds. ENTSO-E’s investigation documents a cascade of generation disconnections, rising transmission voltages, falling frequency and the eventual separation of Spain and Portugal from Continental Europe. This engineering reconstruction examines the sequence that brought down the grid.
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The Grid Before the Blackout: Generation, Topology and Voltage Control
Before the Iberian blackout of April 28, 2025, Spain’s transmission system was exporting electricity to neighboring networks while operators managed oscillations and changing voltage conditions. This engineering investigation examines the network configuration, generation resources, reactive-power capabilities and operating decisions that shaped the system’s vulnerability.
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Spain’s 2025 Blackout: How a Voltage Crisis Brought Down the Iberian Grid
On April 28, 2025, the electricity systems of mainland Spain and Portugal collapsed in a rapid cascade. Drawing on the ENTSO-E investigation, this engineering analysis examines the voltage-control failures, oscillations, generation disconnections and operational challenges behind one of Europe’s most consequential blackouts.
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Protection-Relay Settings Contributed to Koeberg Nuclear Unit Shutdown, Operator Reports
Koeberg Unit 1 has returned to service after an October 16 electrical disturbance. Eskom identifies a conservative relay setting as a contributor and says protection operated as designed.
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Texas Adds New Grid Stability Constraint Following Generation Expansion in Nueces County
ERCOT has announced a new bidirectional transmission constraint for the Nueces County 138-kV area, effective November 4. The operator links the change to new generation resources.
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New Technical Evidence Sheds Light on Britain’s June Grid Disturbances
Ofgem has published NESO’s preliminary account of June’s heatwave operating conditions. Frequency records, demand forecasts and network constraints provide evidence for a review whose regulatory conclusions remain pending.
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Nigeria’s Grid Generation Fell Nearly 88%. What Really Happened?
Nigeria’s electricity generation fell nearly 88% between reported readings on October 19 as multiple 330-kV transmission lines tripped. The system operator says the disturbance was partial. What do the engineering facts reveal—and what remains unknown?