Dear Riaan,
I am sure there must be special provisions for your grandfather – check the NMBM policies. Best is to contact the council and make an application to them for a special arrangement if he is the home owner. Electricity tariffs are designed to penalise you for higher usage, the reasons being to incentivise less consumption and the assumption that if you use more you can afford more. It’s not always a matter of somebody getting more electricity for “free”, they are just paying less for what they use as the kwhr rate is lower.
Typically there are policies that do not allow council to install prepayment in homes where there are medical equipment installed operating off electricity that could cause a life threatening situation if power is disconnected.
Phone the NMBM Customer services at 041 506 5555 and find out what the procedure is for such an application. Get a copy of the applicable tariff and check if there are alternative option e.g. changing to a more practical tariff etc.
In the mean time consider way to reduce the general consumption in the household by using CFL’s etc. to try and get the consumption down.
Hope you come right.
Jacques Wright (Pr.Eng)
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