Human error caused Jan 9 blackout: report SOPs not followed during maintenance working, NA panel told The power division spokesperson also appealed to the masses to display patience. PHOTO: FILE ISLAMABAD: The Power Division has informed a parliamentary panel that an inquiry committee probing into last month’s countrywide blackout has held some Guddu Thermal Power Plant officials responsible. “The problem occurred due to a human error at the Guddu power station. The error led to the tripping of the entire power system. The fault occurred as some officials did not follow SOPs [standard operating procedures] during maintenance work,” said Secretary Power Ali Raza Bhutta on Monday.