After announcing Stage 3 load shedding earlier, Eskom's now moving it up to Stage 4 from 12:00 on Saturday.
The power utility says this is due to the loss of an additional 900MW capacity from Mozambique.
A statement issued earlier reads: the situation remains tight and volatile.
It's promised regular updates on the power system.
#POWERALERT 3— Eskom Hld SOC Ltd (@Eskom_SA) March 16, 2019
Date: 16 March 2019
Rotational loadshedding moves to Stage 4 from 12h00, due to loss of additional capacity from Mozambique @TimesLIVE @ewnupdates @eNCA @SABCNewsOnline @CityPowerJhb @City_Ekurhuleni @CityTshwane @CityofCT @eThekwiniM pic.twitter.com/kN9eQRUlpr