South African electric utility City Power from Johannesburg this morning encrypted all its systems, including databases and applications. The incident affects one of the largest power suppliers in Johannesburg, owned by the city municipality. At the same time, customers reported multiple power outages on Twitter [1, 2, 3] but it has not been confirmed if they are related. Ransomware attacks have targeted a whole slew of other cities during the last two weeks. La Porte County, Indiana, had to pay $130,000 to recover data on encrypted computer systems.
Source: https://www.bleepingcomputer.com/news/security/ransomware-attack-cripples-power-company-s-entire-network/