The Spanish market and competition regulator on Friday opened probes into potential breaches of power sector rules as part of a wider investigation into last year's blackout in the country. Spain's grid buckled on April 28, 2025, leaving the country, most of Portugal, and, for shorter periods of time, parts of France, without electricity. Investigations and multiple reports have found over the past year that the immediate cause of the worst blackout Europe has ever seen in modern times was a surge in voltage. On Friday, the Spanish market and competition…