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    Understanding Your Electricity Bill: Where Your Money Actually Goes

    Confused by your Johannesburg electricity bill or prepaid usage? How to read it, what's driving the cost, and the changes that make the biggest difference.

    18 March 2026 6 min read
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    Electricity bills feel mysterious — a big number with little explanation. But the money almost always concentrates in a few places, and once you can see them, you can cut them. Here's how to read yours.

    Where the money actually goes

    For most homes:

    • Water heating (geyser) — typically 30–40% of the bill, the biggest single item.
    • Space heating in winter — heaters are power-hungry.
    • Pool pumps running too many hours.
    • Old or faulty appliances.

    Tariff hikes add to it, but these few items dominate.

    Find your heavy users

    Switch the geyser off for a day and watch usage drop — that confirms it's the main draw. Note when prepaid units fall fastest and what's running. For precise figures, an electrician can meter individual circuits.

    The quickest savings

    Control the geyser first — a GeyserWise controller, blanket and insulation hit your biggest user cheaply. Then LED lighting, smart heating habits, and eventually solar.

    Rule out a fault

    A jump with no change in habits can mean a faulty geyser or earth fault. Ask us to investigate rather than just paying more.

    Frequently Asked Questions

    For most homes the biggest drivers are water heating (the geyser, often 30–40% of the bill), space heating in winter, pool pumps, and old or faulty appliances. Tariff increases add to it, but usage from these few big items dominates. Targeting the geyser first gives the biggest saving.

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