The outage resurrected memories of other massive power blackouts , including one in 1977 that left about 9 million people without electricity for 25 hours .
The outage resurrected memories of other massive power blackouts , including one in 1977 that left about 9 million people without electricity for 25 hours .
A power cut in New York in 1977 left 9 million people without electricity for up to 25 hours .