MADRID, Feb 12 (Reuters) - Spanish power grid operator REE did not have enough conventional plants in its energy mix planning, creating risks that may have led to the nationwide blackout on April 28 last year, the CEO of utility Endesa told a Senate hearing on Thursday.
Jose Bogas said that Endesa's power plants complied with rules and did not disconnect improperly that day, adding that another blackout was possible under similar conditions.
(Reporting by Pietro Lombardi; Writing by David Latona; Editing by Andrei Khalip)
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