Why Is My Prepaid Electricity Running Out So Quickly?

Have you ever bought prepaid electricity and felt like it disappeared almost immediately?

You load electricity onto your meter, check the balance a few days later and wonder: “How can I possibly have used that much electricity already?”

It can be frustrating, particularly when it seems as though you are buying electricity more frequently than you used to.

However, prepaid electricity running out quickly does not necessarily mean that your meter is faulty or that something is wrong with the electricity supply. There are several possible reasons, including increased household consumption, changes to your electricity tariff, higher usage by certain appliances and additional charges.

The first step is to work out whether you are actually using more electricity, paying more for the electricity you use, or experiencing a genuine metering or electrical problem.

Why Does Prepaid Electricity Run Out So Quickly?

There are several reasons why your prepaid electricity may appear to be disappearing faster than usual.

The most common include:

1. Your household is using more electricity.
2. Your electricity tariff has changed.
3. You have moved into a higher tariff block.
4. A high-consumption appliance is being used more frequently.
5. An appliance or electrical system may be consuming more electricity than expected.
6. There may be additional charges or deductions associated with your electricity purchase.
7. There could be a genuine problem with the meter or electrical installation.

Before assuming that something is wrong, it is worth looking at your actual electricity consumption in kilowatt-hours (kWh).

Are You Actually Using More Electricity?

One of the most common mistakes people make when monitoring prepaid electricity is comparing rand amounts instead of electricity consumption.

For example, suppose you normally buy R500 of electricity, and it lasts you a week. If you buy another R500 a few weeks later and it only lasts five days, it is natural to assume that something has gone wrong.

But the amount of electricity you receive for R500 can change depending on the applicable tariff and other charges.

A better way to investigate your usage is to compare your kWh consumption.

For example:

Previous meter reading: 8,420 kWh
Current meter reading: 8,510 kWh

Your consumption was:

8,510 − 8,420 = 90 kWh

If you used 90 kWh last week but 130 kWh this week, you have a genuine increase in electricity consumption — regardless of how much money you spent.

Understanding this difference between money spent and electricity consumed is an important first step in finding out why your prepaid electricity is running out quickly.

If you aren’t sure how to calculate your consumption, see our guide to [how to calculate electricity usage in kWh].

Has Your Electricity Tariff Changed?

Another possibility is that you are paying more for the electricity you use.

Electricity tariffs in South Africa can vary depending on factors such as:

• Your municipality or electricity supplier
• Your tariff category
• Your level of electricity consumption
• The structure of the applicable tariff
• Fixed or service charges
• VAT
• Annual tariff increases

This means that the same amount of money does not necessarily buy the same number of units every time.

For example, if you previously received 150 kWh for a particular amount but now receive fewer units for the same amount, it does not automatically mean that your meter is faulty. The applicable electricity tariff may have changed.

This is particularly important when comparing electricity purchases made in different months or years.

Could You Have Moved Into a Higher Tariff Block?

Some electricity tariffs use an inclining block structure.

In simple terms, this means that electricity is divided into consumption blocks, with different rates applying as consumption increases.

The exact structure depends on the applicable municipality and tariff.

This can create a situation where buying more electricity does not simply mean receiving a proportionally larger number of units.

For example, a household that normally uses a relatively small amount of electricity may pay one rate for its initial consumption. If its usage increases significantly, some of that additional consumption may fall into a higher-priced block.

As a result, the household may find that the same rand amount buys fewer units than expected.

This is one reason why it is important to look at kWh consumption and the applicable tariff, rather than judging your electricity usage purely by how much money you spend.

Has Your Household’s Electricity Usage Changed?

Sometimes the explanation is much simpler: you are using more electricity than you were before.

Small changes in your household routine can add up surprisingly quickly.

For example, your electricity consumption may increase because:

• The weather has become colder.
• You are using electric heaters.
• Your geyser is working harder or being used more frequently.
• More people are staying in the home.
• You are spending more time at home.
• You are working from home.
• You are cooking more often.
• Your air conditioner is running for longer.
• Your pool pump is operating for additional hours.
• You have started using a new appliance.
• You are doing more washing or drying.

This is why comparing your electricity consumption over several weeks or months can be much more informative than looking at a single prepaid purchase.

Which Appliances Could Be Using More Electricity?

Some appliances can have a particularly noticeable impact on your electricity consumption.

Geysers

Electric geysers can be significant electricity users because heating water requires a considerable amount of energy.

Your geyser may use more electricity if:

• More hot water is being used.
• The thermostat is set too high.
• The geyser is heating water more frequently.
• There is increased household occupancy.
• Hot water is being wasted.
• The geyser or associated components require attention.

If you have recently changed your household’s hot-water usage, it could contribute to your prepaid electricity running out faster.

Electric heaters

Electric heaters can consume a lot of electricity because they often have relatively high power ratings.

A 2,000-watt heater operating continuously for three hours, for example, would theoretically consume:

2 kW × 3 hours = 6 kWh

If you use several heaters for several hours a day during winter, your electricity consumption can increase significantly.

Air conditioners

Air conditioners can also increase electricity consumption, particularly when used for extended periods for heating or cooling.

Actual consumption depends on the type and efficiency of the unit, its operating mode, the temperature setting and how long it runs.

Pool pumps

A pool pump may not have the same high power rating as an electric heater, but it can operate for several hours every day.

That means its cumulative electricity consumption can become significant over time.

Ovens, stoves and tumble dryers

Appliances that generate heat generally require considerable energy.

If you are using your oven, electric stove or tumble dryer more frequently than usual, this can contribute to higher electricity consumption.

Could an Appliance Be Faulty?

Sometimes an unexplained increase in electricity consumption can be related to an appliance or electrical system that isn’t operating correctly.

For example, a refrigerator that is struggling to maintain its temperature may run more frequently than normal. A geyser problem could also affect how often it heats water.

Other possibilities can include:

• A faulty thermostat
• A heating element problem
• A pump operating incorrectly
• An appliance failing to switch off
• Equipment running continuously when it shouldn’t

If your electricity consumption has suddenly increased and you cannot identify a change in your household’s behaviour, it may be worth having the relevant appliance or electrical installation checked.

Could Something Be Using Electricity Without You Realising It?

Not all electricity consumption comes from the appliances you use most obviously.

There can be other electrical loads around a property that operate automatically or are easily overlooked.

These could include:

• Security systems
• Electric fences
• Gate motors
• Water pumps
• Outside lighting
• Wi-Fi and network equipment
• Garage equipment
• Aquarium equipment
• Heated towel rails
• Underfloor heating
• Workshop equipment

Standby consumption from electronics can also contribute to your overall electricity usage, although it is not necessarily the biggest cause of a rapidly increasing electricity bill.

The important point is to consider everything connected to your electrical system, particularly equipment that operates automatically or continuously.

How Can You Check Whether Your Electricity Usage Has Increased?

The easiest way to investigate your consumption is to start tracking your meter readings.

Step 1: Record your meter reading

Write down your current meter reading.

Step 2: Wait 24 hours

Continue using electricity normally for a day.

Step 3: Record the reading again

Check your meter at approximately the same time the following day.

Step 4: Calculate the difference

Subtract the first reading from the second.

For example:

Morning reading: 10,250 kWh
Next morning: 10,262 kWh

Your household used:

12 kWh in 24 hours

Repeat this over several days to establish a more reliable average.

You can then compare your daily usage with previous periods and investigate any significant changes.

For a more detailed explanation of this process, see our article on [how to calculate your electricity usage in kWh].

Don’t Confuse Higher Electricity Consumption With Higher Electricity Costs

This distinction is particularly important.

There are two different questions:

Are you using more electricity?

and

Are you paying more for the electricity you use?

They aren’t necessarily the same thing.

Your household might use approximately the same number of kWh but pay more because of a tariff increase or other changes to the applicable tariff.

Alternatively, your electricity tariff may remain unchanged while your consumption increases because you are using more heating, hot water or other appliances.

Tracking your kWh consumption helps you determine which situation you are dealing with.

Could Your Prepaid Meter Be Faulty?

It is possible, but a faulty meter should not be the first assumption simply because your electricity is running out faster.

Before concluding that the meter is malfunctioning, check:

• Whether your actual kWh consumption has increased.
• Whether your electricity tariff has changed.
• Whether your household’s electricity usage has changed.
• Whether a high-consumption appliance is operating more frequently.
• Whether there are additional charges or deductions.
• Whether other electrical equipment is running unexpectedly.

However, if your consumption appears dramatically higher without an obvious explanation, it is worth investigating further.

Warning signs could include:

• A sudden and unexplained increase in consumption.
• Unexpected meter behaviour.
• Unusual error messages on the meter.
• Electricity being consumed when the property’s major electrical loads are switched off.
• Readings that appear inconsistent.

Do not attempt to open, modify or interfere with an electricity meter yourself. Metering equipment and electrical installations can be dangerous and should be assessed by the appropriate electricity provider, metering specialist or qualified electrician.

What If You Share Electricity With Other People?

Prepaid electricity can become particularly difficult to manage when several people or units share the same electricity supply.

For example, a property might contain:

• A main house and a granny flat
• Several rental units
• Student accommodation
• Multiple offices
• A sectional-title development
• Several tenants sharing facilities

If everyone is using electricity through a single meter, it can be difficult to determine who is responsible for how much of the consumption.

One household might feel that its electricity usage is reasonable while another household’s appliances are contributing significantly more to the overall consumption.

Separate metering or sub-metering can help make consumption more transparent by allowing individual units or areas to be monitored separately.

This can be particularly valuable for landlords and property managers who need to manage and recover electricity costs fairly.

How Can You Make Your Prepaid Electricity Last Longer?

There is no single trick that will make prepaid electricity last longer. The most effective approach is to understand where your electricity is going and reduce unnecessary consumption.

Start by:

Monitor your kWh usage

Don’t only monitor how many rand you spend. Track how many kWh your household actually uses.

Identify your biggest electricity users

Pay particular attention to geysers, heaters, air conditioners, pool pumps and other high-energy appliances.

Review your geyser usage

Look at when and how often your geyser heats water and whether your household’s hot-water habits have changed.

Reduce unnecessary heating and cooling

Heating and cooling can have a significant effect on electricity consumption, particularly when used for several hours each day.

Check your pool pump schedule

If you have a pool, make sure the pump isn’t operating for longer than necessary.

Look for equipment that runs continuously

Check whether pumps, lights, appliances or other equipment are operating when they don’t need to.

Investigate sudden changes

If your electricity consumption increases unexpectedly, try to identify what changed rather than simply buying more electricity.

When Should You Investigate Your Meter or Electrical System?

It is worth investigating further if your electricity consumption:

• Suddenly increases substantially.
• Remains unusually high despite no significant lifestyle changes.
• Appears inconsistent with your normal usage.
• Continues increasing without an obvious explanation.
• Indicates electricity consumption when the property should have very little electrical activity.

Start by checking your meter readings and tariff information.

If the figures still don’t make sense, contact the relevant electricity provider or have the electrical installation and relevant equipment assessed by a qualified professional.

How JKNV Energy Can Help

For a single household, understanding your electricity consumption can help you manage your own electricity budget.

For landlords, property managers and owners of multi-unit properties, accurate metering can be even more important.

JKNV Energy provides prepaid electricity metering and utility management solutions that can help property owners and managers monitor and manage electricity consumption across individual units and properties.

Prepaid metering can provide occupants with greater visibility and control over their own electricity consumption, while helping property owners manage electricity costs and reduce uncertainty around utility recovery.

This can be particularly useful for rental properties, sectional-title developments, student accommodation and other multi-unit environments.

Final Thoughts

If your prepaid electricity seems to be running out much faster than it used to, don’t immediately assume that your meter is faulty.

Start with the basics.

How many kWh are you actually using?

Then ask:

• Has your household’s electricity consumption increased?
• Has your electricity tariff changed?
• Have you moved into a higher tariff block?
• Are you using a geyser, heater, air conditioner or other high-consumption appliance more frequently?
• Could an appliance or electrical system be using more electricity than expected?
• Is there electricity being consumed somewhere you haven’t considered?

Once you understand the difference between electricity consumption and electricity cost, the problem becomes much easier to investigate.

Your prepaid balance tells you how much money you have left.

Your kWh consumption tells you where your electricity is going.

And understanding that consumption is the first step towards managing your electricity more effectively.