Northeast Blackout (2003)
A software bug at FirstEnergy's control room in Ohio caused a cascade of transmission line failures that blacked out 50 million people across the northeastern U.S. and Ontario. The blackout caused an estimated $6 billion in economic losses and lasted up to four days in some areas.
Congress passed the Energy Policy Act of 2005, making grid reliability standards mandatory and enforceable for the first time.
The blackout exposed how fragile coordination is between separate grid operators, a structural problem that persists in the limited transfer capacity at seams like PJM-MISO.
The PJM-MISO seam congestion Indiana's grant targets is the same class of inter-operator coordination problem that contributed to the 2003 cascade. Weak seams between independently operated grids remain the grid's most vulnerable points.
