Saudi electricity utility SEC says that generating capacity available to supply the Saudi national grid amounted to 74.3GW at the end of 2016, an increase of 7.4% from the 69.2GW available for supplying customers at the end of 2015.

SEC is by far Saudi Arabia’s largest generator, with total capacity of 55GW at end-2016. The remainder is capacity available from some of the 16 other companies with their own power plants, some of which have agreements to deliver excess generated power to...