What to know about the electrical grid failure that plunged Cuba into darkness  The Associated PressCuba Suffers Second Power Outage in 24 Hours, Realizing Years of Warnings  The New York TimesCuban electrical collapse causes island-wide blackout, paralyzes economy  The Washington PostCuba Struggles to Restore Power as Islandwide Blackout Persists  BloombergCuba power outage: Entire island goes dark, 10 million affected after electrical grid fails  NBC News