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How to calculate the cost of electricity in our homes

Have we ever wondered why the use of electricity at home is so high that the costs incurred are also quite large? Or do we suspect that it turns out that the electricity in our house is damaged and there is an electric power leak? We can actually do independent electricity cost calculations to compare the cost of electricity in our homes with calculations from PLN. To do this, follow the following ways to calculate electricity costs:

1. What class of electricity tariff is in our house?
The first way to calculate electricity costs is to know in advance the class of electricity rates in our homes. As is known, in Indonesia there are several types of electricity tariff groups based on power limits, including 900 VA (Volt Ampere), 1,300 VA, 2,200 VA, 3,300 VA, 4,400 VA, 5,500 VA, and 6,600 VA and above.

Different power limits will also affect different classes of basic electricity rates. For example, for 900 VA electricity, the basic electricity tariff to be paid is 1,352 per kWH. For those who use the 1,300 VA-2,200 VA group and above, the basic electricity tariff to be paid is IDR 1,467.70 per kWH.

By knowing the class of electricity tariffs, it will be easier for us to calculate the monthly electricity costs. The electricity tariff and its class as of August 2022 are as follows:

• Class R-1/TR power 900 VA, Rp 1,352,- per kWh
• Class R-1/ TR power 1,300 VA, Rp 1,444,70,- per kWh
• Class R-1/ TR power 2,200 VA, Rp 1,444,70,- per kWh
• Class R-2/ TR power 3,500-5,500 VA, Rp 1,699,53,- per kWh
• Class R-3/ TR power 6600 VA and above, Rp 1,699.53,- per kWh


2. What appliances in our homes use electricity?
The next way is to check and record all the appliances in the house that require electricity. For example, at home we use the following equipment:
• 1 washing machine, 350 watts of power
• 1 refrigerator, 350 watts of power
• 1 iron, 300 watts of power
• 1 TV, 80 watts
• 1 AC, 800 watts of power
• 1 vacuum cleaner, 500 watts of power
• 10 LED bulbs, 7 watts of power each


3. What is the approximate power consumption of our Electrical Appliances?

This is followed by a calculation based on the estimated duration of daily use of electrical equipment. The following is an example of estimated electricity usage from the data above:

• 1 washing machine with 350 watts of electricity, used an average of 1 hour per day, so the total usage is 350 watts
• 1 refrigerator with 350 watts of power, generally running for 24 hours. So the estimate is 350 x 24 = 8,400 watts
• 1 iron with 300 watts of electricity, for example, the average usage per day is 1 hour, then the power used is 1 x 300 = 300 watts
• 1 TV with 80 watts of power, 5 hours of daily use. So the estimate is 80 x 5 = 400 watts
• 1 AC with an electrical power of 800 watts is used per day for at least 10 hours, then the estimated power usage becomes 800 x 10 = 8,000 watts
• 1 vacuum cleaner with 500 watts of power, the average use per day is 1 hour, so the power is 500 watts
• 10 LED lamps, each of 7 watts of power is on for 12 hours. Then the estimated total power usage is 10 x 7 x 12 = 840 watts



The calculation of the estimated use of electric power can, of course, differ depending on the use in each home. If there are some equipment that is not used daily, then we can calculate it by making an average first, and then calculating the estimated daily usage.



4. How much does our electricity cost per month?
The last step to calculate the cost of electricity at home, is to add up all the use of electrical appliances in our homes. Based on the data above, the amount of electricity used in one day at our house is 350 watts + 8,400 watts + 300 watts + 400 watts + 8,000 watts + 500 watts + 840 watts = 18,790 watts.

To calculate the cost of electricity, we need to convert watts to kilowatts per hour or kWh. The trick is to divide the total power usage by 1,000, or 18,790: 1,000 = 18.79 kWh.

This number can then be used to calculate the estimated daily electricity cost in our homes, by multiplying it by the basic electricity tariff according to the class we use at home. If our basic electricity tariff is the tariff for Group R-1/TR power of 1,300 VA, Rp. 1,444,70, - per kWh, then it is enough to multiply 18.79 kWh by Rp. 1,440,70, - so that the result is Rp. 27,070,753, -

To calculate the estimated electricity cost in a month, just multiply by 30, which is Rp. 27,070,753,- x 30 = Rp.812.122,590,-

This estimate could be lower or higher (remember the additional PPJ fees, admin fees & stamp duty when using prepaid electricity, special VAT for customers above 3,500 VA, etc.). Finally, it all goes back to how to use electricity, electrical appliances, and electrical power in our respective homes.

Happy counting, good health

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