I'm going to save that 31.3% by pre-purchasing as much electricity as I can afford before 01July2009.
Once I've purchased all that electricity, I'll want to make it last as loooong as possible - I'll do that by checking where the biggest savings can be made by re-analysing my household's usage and cut down on the most expensive appliances: Saving electricity tips
See here for last year's posting (still relevant) for all the answers and the "Electricity Tariff Calculator tool": Beat Eskom price increases
This year's increase details:
When are the tariffs going up? @ 23h59 on Tues night 30 June 2009.
How much will the increases be? 2009's increase is 31.3%
The posting answers questions like:
How full can your pre-payment meter go?
How much can I purchase on my credit card?
Which tariff plan am I on?
If I fill my meter up too much will I lose my free 50 kWh per month?
And while you're saving money, why not ready the blog "Why pay cash for pre-paid electricity when you can use your credit card?" and earn cash back and "reward points".
How to save electricity:
*) turn down the temperature setting on your thermostat - here's where and how: Where is my geyser's thermostat? How do I turn it down?
*) use less hot water (ie. Install a low‑flow shower head). See here to purchase RST Profilence (RST contact details) and here for a report on savings (water and electricity
*) Shower, don't bath: see here for report on how much less power a shower uses than a bath
*) Install a geyser blanket to insulate your geyser and pipes. See here for a report on savings when using a geyser blanket (30% improvement)
*) use the ‘Electricity Usage Calculator’ to see where you ‘spend’ your electricity.
*) Reduce your pool pump's ON time per day
*) Install ceiling insulation. See here for more info and suppliers
*) Lastly, use solar power to heat your geyser: install solar panels. If you are building a new house or if you replace your geyser, then install solar panels and a time switch. See here for non-savings installing a time switch if you don't have a solar geyser: non-savings report
Update on 16June2010:
Watch out or, at least, be aware: #WTF Geyser's element has just blown <3 years after installation... 5 year geyser warranty, but only 3 months on the element! #FFS #RipOff