Why are bills not going down despite all the shedding?

 In a domestic household the geyser normally contributes about 60-70% of the total bill. The stove and heating requirements in winter normally contribute another 15-20%. The balance is used for lighting, pumping and other uses. Even if ZESA switches the geyser off, it will make up the time it lost by heating the water up to a present temperature at another time of the day. Hence the energy is still consumed but at a different time of the day. Cooking a little earlier or a little later, whilst inconvenient, still consumes the same power. So despite not having power when we want it, energy is still consumed, as refrigerators and deep freezers catch up on chilling their contents, geysers warm the water to the preset temperature and water pumps top up emptied reservoirs.
 The electricity meter only measures the power that passed through it and since the power is still used but at a different time, the monthly bill does not change much.