The power utility said it continued with loadshedding throughout the night in an effort to build up necessary water reserves in the pump storage scheme.
Eskom revealed in a statement that even with the implementation of stage 4 loadshedding on Saturday, it experienced a further decline in water reserves, which was used to supplement generation capacity.
The power utility said stage 4 loadshedding was necessitated by loss of capacity which included imports from Mozambique due to cyclone Idai.
Stage 4 means loadshedding will occur 12 times over a 4 day period for 2 hours at a time, or over an 8 day period for 4 hours at a time.