{"content_id":"mgnkmkypzg","slug":"kepco-on-electricity-usage-estimated-bill-guide","locale":"en","schema_type":"HowTo","category":"how_to","category_name":"How-to","title":"How to Check AC Electricity Use and Estimated Bills on KEPCO ON","summary":"By registering your customer number with KEPCO ON, you can view your electricity usage and billing history and use your current meter reading to estimate this month's bill. For high-voltage apartments, KEPCO's estimate may differ from the actual maintenance fee bill because the management office calculates charges separately for each household.","author":{"name":"Injoys Editorial Team","url":"https://injoys.com/ko/about"},"key_points":["Households that contract directly with KEPCO can register their customer number with KEPCO ON to view electricity usage and billing history.","The difference between the current meter reading and the previous meter-reading value is the basic electricity usage for that period.","Residents of high-voltage apartments must confirm the apartment's customer number, building and unit numbers, and other required information before calculating an estimated bill.","The summer progressive-rate tiers for residential electricity apply to usage in July and August, and the billing calculation period varies depending on the meter-reading date.","To calculate the additional cost of using an air conditioner, do not multiply its power consumption by a single rate; add it to existing usage and calculate the cost for each progressive-rate tier."],"content_markdown":"Running an air conditioner for a long time does not mean you have to wait until the end of the month to find out your electricity bill. In KEPCO ON, you can check usage and billing details for registered electricity service contracts and enter the current meter reading to calculate the estimated bill through the next meter-reading date.\n\nHowever, homes that contract directly with KEPCO and high-voltage apartments where the entire apartment complex is covered by a single contract have different inquiry methods and entities responsible for final settlement. When reviewing an estimate, you should check the contract type, meter-reading date, progressive rate tier, and the management office’s allocation criteria together.\n\n## Information to Prepare Before Checking\n\nChecking the following information in advance will make inquiries and calculations easier.\n\n- **Customer number:** Find it on your KEPCO electricity bill or in the electricity service contract information in KEPCO ON.\n- **Building and unit numbers:** These may be required to check the estimated bill for an individual household in a high-voltage apartment.\n- **Previous meter reading:** Find it on the previous bill or apartment maintenance fee statement.\n- **Current meter reading:** Check the current number directly on the household meter.\n- **Meter-reading date or usage period:** The actual usage period is more important than the billing month.\n- **Contract type:** Basic charges and energy charges differ depending on the contract, such as residential low-voltage or residential high-voltage service.\n\nIf you do not know the customer number, households that contract directly with KEPCO can find it on a previous bill or in KEPCO ON. If the entire apartment complex has a contract with KEPCO, it is more accurate to ask the management office about the apartment’s customer number, how to check the household meter, and the electricity billing contract arrangement.\n\n## Checking Usage and the Estimated Bill in KEPCO ON\n\nThe screen layout and menu names in KEPCO ON may change, but the basic procedure is as follows.\n\n### Homes Contracting Directly with KEPCO\n\n1. Access KEPCO ON, log in, and complete identity verification.\n2. Register the customer number in the electricity service contract management menu.\n3. Check monthly usage and billing details in the usage and billing inquiry menu.\n4. Calculate current usage that has not yet been billed in the home electricity bill preview.\n5. Enter the previous meter reading, current meter reading, and meter-reading information.\n6. Check usage to date and the estimated bill in the calculation results.\n\nUsage information may be provided automatically for meters that support remote reading. However, due to delays in communication and aggregation, the latest usage shown on the screen may not exactly match the number on the meter.\n\n### Households in High-Voltage Apartments That Do Not Contract Directly with KEPCO\n\nIn a typical high-voltage apartment arrangement, KEPCO bills the entire apartment complex’s usage under a single contract, and the management office divides the usage among households and reflects it in their maintenance fees. Such households may not have individual customer numbers or may be unable to link the contract using KEPCO ON’s standard customer registration process.\n\n1. Check the apartment’s customer number and contract arrangement on the maintenance fee statement or with the management office.\n2. In the KEPCO ON home electricity bill preview, select the inquiry type for high-voltage apartments.\n3. Enter the information requested on the screen, such as the apartment customer number, building and unit numbers, and meter reading.\n4. Treat the calculated amount as an estimate for reference and check the final amount on the maintenance fee statement.\n\nDepending on the apartment’s system or contract arrangement, household information may not be available through the official calculation screen. In this case, you must use the household usage and billing calculation criteria provided by the management office.\n\n## Why the Estimate and Actual Maintenance Fee May Differ\n\nThe KEPCO ON result is an estimate calculated based on the usage entered and KEPCO’s rate system. The actual bill may differ for the following reasons.\n\n| Cause of difference | Effect on the actual bill |\n|---|---|\n| Difference in meter-reading timing | Electricity used after the inquiry and through the meter-reading date is added. |\n| Incorrect meter reading entered | Misreading a number or omitting a decimal point or multiplier changes the calculated usage. |\n| Delay in reflecting remote meter readings | Usage shown in KEPCO ON may lag behind the latest meter reading. |\n| Entry into a higher progressive rate tier | If additional usage enters a higher tier, the average unit rate may rise. |\n| Discounts and reductions | Whether welfare discounts, large-family discounts, and other reductions apply to the actual contract changes the result. |\n| Climate and environmental charges and fuel cost adjustment charges | The final amount changes depending on the applicable rates and period. |\n| Value-added tax and Electric Power Industry Basis Fund | Statutory charges other than energy charges are included in the final bill. |\n| Allocation of common-area electricity in apartments | Common-area usage for elevators, hallways, parking lots, and other facilities may be allocated separately in maintenance fees. |\n| Management office settlement criteria | Differences may arise depending on the apartment’s contract arrangement, rounding, meter-reading date, and household allocation criteria. |\n\nTherefore, KEPCO ON calculation results for high-voltage apartments should be understood as reference values for electricity used exclusively by the household. If the electricity section of the maintenance fee includes common-area electricity charges, it cannot be directly compared with the KEPCO ON estimate.\n\n## Summer Progressive Rate Tiers for July–August and Meter-Reading Dates\n\nResidential electricity uses a progressive rate structure in which the rate rises by tier as usage increases. Under the standard summer criteria, the progressive rate tiers for electricity used in July and August are expanded as follows.\n\n| Category | Tier 1 | Tier 2 | Tier 3 |\n|---|---:|---:|---:|\n| Summer, July–August | At most 300kWh | 301–450kWh | More than 450kWh |\n| Other seasons | At most 200kWh | 201–400kWh | More than 400kWh |\n\nThe boundaries in this table describe usage tiers, and the actual rates may differ depending on whether residential low-voltage or high-voltage service applies and when they take effect. Calculations should prioritize the latest rates reflected in KEPCO ON.\n\n### Why You Should Check the Usage Period Rather Than the Billing Month\n\nA bill received in August does not necessarily cover only electricity used from August 1 through 31. For example, if the meter-reading date is the 15th of every month, the billing period generally runs from the day after the previous month’s meter-reading date through the current month’s meter-reading date.\n\nIf the usage period spans summer and non-summer seasons, the seasonal tiers may be divided and applied according to KEPCO’s calculation criteria. When comparing bills, do not look only at the billing month; also check the usage period, meter-reading date, and number of usage days.\n\n## Calculating an Air Conditioner’s Monthly Electricity Usage\n\nAn air conditioner’s monthly electricity usage can be roughly calculated using the power consumption shown on the product and its operating time.\n\n**Monthly usage (kWh) = Power consumption (W) ÷ 1,000 × Hours of use per day × Number of days used × Load factor**\n\nThe load factor is a simplified value representing the proportion of time the air conditioner actually operates at the stated power consumption level. In fixed-speed models, the compressor repeatedly switches on and off, while in inverter models, power consumption continuously changes according to the indoor and set temperatures. This makes it difficult to determine an exact load factor in advance.\n\n### Calculation Examples\n\nThe values below are assumptions intended to demonstrate the calculation method, not averages by product type. Actual calculations should use the rated cooling power consumption shown on the product’s energy efficiency label or nameplate.\n\n| Example appliance | Assumed power consumption | At 8 hours per day, 30 days, and a 60% load factor |\n|---|---:|---:|\n| Window air conditioner | 900W | About 129.6kWh |\n| Portable air conditioner | 1,200W | About 172.8kWh |\n| Wall-mounted air conditioner | 700W | About 100.8kWh |\n\nFor the window air conditioner, the calculation is `0.9kW × 8 hours × 30 days × 0.6 = 129.6kWh`.\n\nEfficiency should not be assumed based solely on the product type. Even among wall-mounted or window models, actual consumption can vary significantly depending on cooling capacity, whether the unit uses an inverter, installation conditions, outdoor temperature, room size, and insulation performance.\n\n## The Correct Way to Estimate Additional Air-Conditioning Costs\n\nMultiplying air-conditioner usage by a single price per kWh does not properly account for progressive rates. A more accurate method is to compare the difference between the following two amounts.\n\n1. Calculate the electricity bill using the household’s estimated monthly usage excluding the air conditioner.\n2. Add the air conditioner’s estimated monthly usage and calculate it again.\n3. Treat the difference between the two estimated bills as the additional cost of using the air conditioner.\n\nFor example, if a household’s existing usage is already close to the upper limit of Tier 1, some of the air conditioner’s usage may fall into Tier 2 or Tier 3. Conversely, households with low baseline usage may incur different additional charges even when using the same air conditioner for the same amount of time because their progressive rate tier composition differs.\n\n## Checklist for Reading Inquiry Results Accurately\n\n- Confirm that the customer number on the inquiry screen matches the actual address.\n- Check the meter-reading start and end dates rather than the billing month.\n- Verify the usage by subtracting the previous reading from the current meter reading.\n- If the meter has a separate multiplier, do not calculate it arbitrarily; check the criteria on the bill or with the management office.\n- Confirm whether residential low-voltage or high-voltage service applies.\n- In apartments, distinguish between household-only electricity and common-area electricity.\n- Account for usage that will be added through the meter-reading date after the estimate is calculated.\n- Confirm the final amount payable on the KEPCO bill or maintenance fee statement.\n\nDuring extreme heat, it is also important not to excessively limit air conditioning in an effort to reduce costs. In particular, households with people at high risk of heat-related illness, such as older adults, infants, young children, and people with chronic illnesses, should prioritize health and safety and manage their budget by checking usage frequently.","content_html":"\u003cp\u003eRunning an air conditioner for a long time does not mean you have to wait until the end of the month to find out your electricity bill. In KEPCO ON, you can check usage and billing details for registered electricity service contracts and enter the current meter reading to calculate the estimated bill through the next meter-reading date.\u003c/p\u003e\n\u003cp\u003eHowever, homes that contract directly with KEPCO and high-voltage apartments where the entire apartment complex is covered by a single contract have different inquiry methods and entities responsible for final settlement. When reviewing an estimate, you should check the contract type, meter-reading date, progressive rate tier, and the management office’s allocation criteria together.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#information-to-prepare-before-checking\" class=\"anchor\" id=\"information-to-prepare-before-checking\"\u003e\u003c/a\u003eInformation to Prepare Before Checking\u003c/h2\u003e\n\u003cp\u003eChecking the following information in advance will make inquiries and calculations easier.\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomer number:\u003c/strong\u003e Find it on your KEPCO electricity bill or in the electricity service contract information in KEPCO ON.\u003c/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilding and unit numbers:\u003c/strong\u003e These may be required to check the estimated bill for an individual household in a high-voltage apartment.\u003c/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevious meter reading:\u003c/strong\u003e Find it on the previous bill or apartment maintenance fee statement.\u003c/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent meter reading:\u003c/strong\u003e Check the current number directly on the household meter.\u003c/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeter-reading date or usage period:\u003c/strong\u003e The actual usage period is more important than the billing month.\u003c/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContract type:\u003c/strong\u003e Basic charges and energy charges differ depending on the contract, such as residential low-voltage or residential high-voltage service.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eIf you do not know the customer number, households that contract directly with KEPCO can find it on a previous bill or in KEPCO ON. If the entire apartment complex has a contract with KEPCO, it is more accurate to ask the management office about the apartment’s customer number, how to check the household meter, and the electricity billing contract arrangement.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#checking-usage-and-the-estimated-bill-in-kepco-on\" class=\"anchor\" id=\"checking-usage-and-the-estimated-bill-in-kepco-on\"\u003e\u003c/a\u003eChecking Usage and the Estimated Bill in KEPCO ON\u003c/h2\u003e\n\u003cp\u003eThe screen layout and menu names in KEPCO ON may change, but the basic procedure is as follows.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#homes-contracting-directly-with-kepco\" class=\"anchor\" id=\"homes-contracting-directly-with-kepco\"\u003e\u003c/a\u003eHomes Contracting Directly with KEPCO\u003c/h3\u003e\n\u003col\u003e\n\u003cli\u003eAccess KEPCO ON, log in, and complete identity verification.\u003c/li\u003e\n\u003cli\u003eRegister the customer number in the electricity service contract management menu.\u003c/li\u003e\n\u003cli\u003eCheck monthly usage and billing details in the usage and billing inquiry menu.\u003c/li\u003e\n\u003cli\u003eCalculate current usage that has not yet been billed in the home electricity bill preview.\u003c/li\u003e\n\u003cli\u003eEnter the previous meter reading, current meter reading, and meter-reading information.\u003c/li\u003e\n\u003cli\u003eCheck usage to date and the estimated bill in the calculation results.\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp\u003eUsage information may be provided automatically for meters that support remote reading. However, due to delays in communication and aggregation, the latest usage shown on the screen may not exactly match the number on the meter.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#households-in-high-voltage-apartments-that-do-not-contract-directly-with-kepco\" class=\"anchor\" id=\"households-in-high-voltage-apartments-that-do-not-contract-directly-with-kepco\"\u003e\u003c/a\u003eHouseholds in High-Voltage Apartments That Do Not Contract Directly with KEPCO\u003c/h3\u003e\n\u003cp\u003eIn a typical high-voltage apartment arrangement, KEPCO bills the entire apartment complex’s usage under a single contract, and the management office divides the usage among households and reflects it in their maintenance fees. Such households may not have individual customer numbers or may be unable to link the contract using KEPCO ON’s standard customer registration process.\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003eCheck the apartment’s customer number and contract arrangement on the maintenance fee statement or with the management office.\u003c/li\u003e\n\u003cli\u003eIn the KEPCO ON home electricity bill preview, select the inquiry type for high-voltage apartments.\u003c/li\u003e\n\u003cli\u003eEnter the information requested on the screen, such as the apartment customer number, building and unit numbers, and meter reading.\u003c/li\u003e\n\u003cli\u003eTreat the calculated amount as an estimate for reference and check the final amount on the maintenance fee statement.\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp\u003eDepending on the apartment’s system or contract arrangement, household information may not be available through the official calculation screen. In this case, you must use the household usage and billing calculation criteria provided by the management office.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#why-the-estimate-and-actual-maintenance-fee-may-differ\" class=\"anchor\" id=\"why-the-estimate-and-actual-maintenance-fee-may-differ\"\u003e\u003c/a\u003eWhy the Estimate and Actual Maintenance Fee May Differ\u003c/h2\u003e\n\u003cp\u003eThe KEPCO ON result is an estimate calculated based on the usage entered and KEPCO’s rate system. The actual bill may differ for the following reasons.\u003c/p\u003e\n\u003cdiv class=\"overflow-x-auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eCause of difference\u003c/th\u003e\n\u003cth\u003eEffect on the actual bill\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Cause of difference\"\u003eDifference in meter-reading timing\u003c/td\u003e\n\u003ctd data-label=\"Effect on the actual bill\"\u003eElectricity used after the inquiry and through the meter-reading date is added.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Cause of difference\"\u003eIncorrect meter reading entered\u003c/td\u003e\n\u003ctd data-label=\"Effect on the actual bill\"\u003eMisreading a number or omitting a decimal point or multiplier changes the calculated usage.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Cause of difference\"\u003eDelay in reflecting remote meter readings\u003c/td\u003e\n\u003ctd data-label=\"Effect on the actual bill\"\u003eUsage shown in KEPCO ON may lag behind the latest meter reading.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Cause of difference\"\u003eEntry into a higher progressive rate tier\u003c/td\u003e\n\u003ctd data-label=\"Effect on the actual bill\"\u003eIf additional usage enters a higher tier, the average unit rate may rise.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Cause of difference\"\u003eDiscounts and reductions\u003c/td\u003e\n\u003ctd data-label=\"Effect on the actual bill\"\u003eWhether welfare discounts, large-family discounts, and other reductions apply to the actual contract changes the result.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Cause of difference\"\u003eClimate and environmental charges and fuel cost adjustment charges\u003c/td\u003e\n\u003ctd data-label=\"Effect on the actual bill\"\u003eThe final amount changes depending on the applicable rates and period.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Cause of difference\"\u003eValue-added tax and Electric Power Industry Basis Fund\u003c/td\u003e\n\u003ctd data-label=\"Effect on the actual bill\"\u003eStatutory charges other than energy charges are included in the final bill.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Cause of difference\"\u003eAllocation of common-area electricity in apartments\u003c/td\u003e\n\u003ctd data-label=\"Effect on the actual bill\"\u003eCommon-area usage for elevators, hallways, parking lots, and other facilities may be allocated separately in maintenance fees.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Cause of difference\"\u003eManagement office settlement criteria\u003c/td\u003e\n\u003ctd data-label=\"Effect on the actual bill\"\u003eDifferences may arise depending on the apartment’s contract arrangement, rounding, meter-reading date, and household allocation criteria.\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/div\u003e\n\u003cp\u003eTherefore, KEPCO ON calculation results for high-voltage apartments should be understood as reference values for electricity used exclusively by the household. If the electricity section of the maintenance fee includes common-area electricity charges, it cannot be directly compared with the KEPCO ON estimate.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#summer-progressive-rate-tiers-for-julyaugust-and-meter-reading-dates\" class=\"anchor\" id=\"summer-progressive-rate-tiers-for-julyaugust-and-meter-reading-dates\"\u003e\u003c/a\u003eSummer Progressive Rate Tiers for July–August and Meter-Reading Dates\u003c/h2\u003e\n\u003cp\u003eResidential electricity uses a progressive rate structure in which the rate rises by tier as usage increases. Under the standard summer criteria, the progressive rate tiers for electricity used in July and August are expanded as follows.\u003c/p\u003e\n\u003cdiv class=\"overflow-x-auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eCategory\u003c/th\u003e\n\u003cth\u003eTier 1\u003c/th\u003e\n\u003cth\u003eTier 2\u003c/th\u003e\n\u003cth\u003eTier 3\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Category\"\u003eSummer, July–August\u003c/td\u003e\n\u003ctd data-label=\"Tier 1\"\u003eAt most 300kWh\u003c/td\u003e\n\u003ctd data-label=\"Tier 2\"\u003e301–450kWh\u003c/td\u003e\n\u003ctd data-label=\"Tier 3\"\u003eMore than 450kWh\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Category\"\u003eOther seasons\u003c/td\u003e\n\u003ctd data-label=\"Tier 1\"\u003eAt most 200kWh\u003c/td\u003e\n\u003ctd data-label=\"Tier 2\"\u003e201–400kWh\u003c/td\u003e\n\u003ctd data-label=\"Tier 3\"\u003eMore than 400kWh\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/div\u003e\n\u003cp\u003eThe boundaries in this table describe usage tiers, and the actual rates may differ depending on whether residential low-voltage or high-voltage service applies and when they take effect. Calculations should prioritize the latest rates reflected in KEPCO ON.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#why-you-should-check-the-usage-period-rather-than-the-billing-month\" class=\"anchor\" id=\"why-you-should-check-the-usage-period-rather-than-the-billing-month\"\u003e\u003c/a\u003eWhy You Should Check the Usage Period Rather Than the Billing Month\u003c/h3\u003e\n\u003cp\u003eA bill received in August does not necessarily cover only electricity used from August 1 through 31. For example, if the meter-reading date is the 15th of every month, the billing period generally runs from the day after the previous month’s meter-reading date through the current month’s meter-reading date.\u003c/p\u003e\n\u003cp\u003eIf the usage period spans summer and non-summer seasons, the seasonal tiers may be divided and applied according to KEPCO’s calculation criteria. When comparing bills, do not look only at the billing month; also check the usage period, meter-reading date, and number of usage days.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#calculating-an-air-conditioners-monthly-electricity-usage\" class=\"anchor\" id=\"calculating-an-air-conditioners-monthly-electricity-usage\"\u003e\u003c/a\u003eCalculating an Air Conditioner’s Monthly Electricity Usage\u003c/h2\u003e\n\u003cp\u003eAn air conditioner’s monthly electricity usage can be roughly calculated using the power consumption shown on the product and its operating time.\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eMonthly usage (kWh) = Power consumption (W) ÷ 1,000 × Hours of use per day × Number of days used × Load factor\u003c/strong\u003e\u003c/p\u003e\n\u003cp\u003eThe load factor is a simplified value representing the proportion of time the air conditioner actually operates at the stated power consumption level. In fixed-speed models, the compressor repeatedly switches on and off, while in inverter models, power consumption continuously changes according to the indoor and set temperatures. This makes it difficult to determine an exact load factor in advance.\u003c/p\u003e\n\u003ch3\u003e\n\u003ca href=\"#calculation-examples\" class=\"anchor\" id=\"calculation-examples\"\u003e\u003c/a\u003eCalculation Examples\u003c/h3\u003e\n\u003cp\u003eThe values below are assumptions intended to demonstrate the calculation method, not averages by product type. Actual calculations should use the rated cooling power consumption shown on the product’s energy efficiency label or nameplate.\u003c/p\u003e\n\u003cdiv class=\"overflow-x-auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eExample appliance\u003c/th\u003e\n\u003cth\u003eAssumed power consumption\u003c/th\u003e\n\u003cth\u003eAt 8 hours per day, 30 days, and a 60% load factor\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Example appliance\"\u003eWindow air conditioner\u003c/td\u003e\n\u003ctd data-label=\"Assumed power consumption\"\u003e900W\u003c/td\u003e\n\u003ctd data-label=\"At 8 hours per day, 30 days, and a 60% load factor\"\u003eAbout 129.6kWh\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Example appliance\"\u003ePortable air conditioner\u003c/td\u003e\n\u003ctd data-label=\"Assumed power consumption\"\u003e1,200W\u003c/td\u003e\n\u003ctd data-label=\"At 8 hours per day, 30 days, and a 60% load factor\"\u003eAbout 172.8kWh\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Example appliance\"\u003eWall-mounted air conditioner\u003c/td\u003e\n\u003ctd data-label=\"Assumed power consumption\"\u003e700W\u003c/td\u003e\n\u003ctd data-label=\"At 8 hours per day, 30 days, and a 60% load factor\"\u003eAbout 100.8kWh\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/div\u003e\n\u003cp\u003eFor the window air conditioner, the calculation is \u003ccode\u003e0.9kW × 8 hours × 30 days × 0.6 = 129.6kWh\u003c/code\u003e.\u003c/p\u003e\n\u003cp\u003eEfficiency should not be assumed based solely on the product type. Even among wall-mounted or window models, actual consumption can vary significantly depending on cooling capacity, whether the unit uses an inverter, installation conditions, outdoor temperature, room size, and insulation performance.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#the-correct-way-to-estimate-additional-air-conditioning-costs\" class=\"anchor\" id=\"the-correct-way-to-estimate-additional-air-conditioning-costs\"\u003e\u003c/a\u003eThe Correct Way to Estimate Additional Air-Conditioning Costs\u003c/h2\u003e\n\u003cp\u003eMultiplying air-conditioner usage by a single price per kWh does not properly account for progressive rates. A more accurate method is to compare the difference between the following two amounts.\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003eCalculate the electricity bill using the household’s estimated monthly usage excluding the air conditioner.\u003c/li\u003e\n\u003cli\u003eAdd the air conditioner’s estimated monthly usage and calculate it again.\u003c/li\u003e\n\u003cli\u003eTreat the difference between the two estimated bills as the additional cost of using the air conditioner.\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp\u003eFor example, if a household’s existing usage is already close to the upper limit of Tier 1, some of the air conditioner’s usage may fall into Tier 2 or Tier 3. Conversely, households with low baseline usage may incur different additional charges even when using the same air conditioner for the same amount of time because their progressive rate tier composition differs.\u003c/p\u003e\n\u003ch2\u003e\n\u003ca href=\"#checklist-for-reading-inquiry-results-accurately\" class=\"anchor\" id=\"checklist-for-reading-inquiry-results-accurately\"\u003e\u003c/a\u003eChecklist for Reading Inquiry Results Accurately\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm that the customer number on the inquiry screen matches the actual address.\u003c/li\u003e\n\u003cli\u003eCheck the meter-reading start and end dates rather than the billing month.\u003c/li\u003e\n\u003cli\u003eVerify the usage by subtracting the previous reading from the current meter reading.\u003c/li\u003e\n\u003cli\u003eIf the meter has a separate multiplier, do not calculate it arbitrarily; check the criteria on the bill or with the management office.\u003c/li\u003e\n\u003cli\u003eConfirm whether residential low-voltage or high-voltage service applies.\u003c/li\u003e\n\u003cli\u003eIn apartments, distinguish between household-only electricity and common-area electricity.\u003c/li\u003e\n\u003cli\u003eAccount for usage that will be added through the meter-reading date after the estimate is calculated.\u003c/li\u003e\n\u003cli\u003eConfirm the final amount payable on the KEPCO bill or maintenance fee statement.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eDuring extreme heat, it is also important not to excessively limit air conditioning in an effort to reduce costs. In particular, households with people at high risk of heat-related illness, such as older adults, infants, young children, and people with chronic illnesses, should prioritize health and safety and manage their budget by checking usage frequently.\u003c/p\u003e\n","tags":["Electricity rates","air conditioner","progressive electricity rates","KEPCO ON","High Voltage Apartments"],"faqs":[{"question":"Do I need a customer number to view my electricity usage on KEPCO ON?","answer":"A customer number is generally required to link an electricity service contract made directly with KEPCO to your account. You can find the customer number on your electricity bill or in the contract information on KEPCO ON. Residents of high-voltage apartment complexes may need to ask the management office for the apartment complex's customer number and instructions on how to look up their information."},{"question":"Is the estimated bill on KEPCO ON the same as the actual amount due?","answer":"The estimated bill is a reference amount based on the usage and rate conditions at the time of entry. The actual amount due may vary depending on subsequent usage, the meter-reading date, discounts, fuel cost adjustments, taxes and funds, and the allocation of electricity used in apartment common areas."},{"question":"If the electricity bill is included in my apartment maintenance fee, can I not look it up on KEPCO ON?","answer":"In a high-voltage apartment complex where the entire complex has a contract with KEPCO, individual households may not have their own customer numbers. You may be able to use the apartment complex's customer number, building number, and unit number in KEPCO ON's estimated bill feature for high-voltage apartment complexes. However, if lookup is not supported, you must check the household usage and settlement records provided by the management office."},{"question":"How do I calculate how much electricity I have used so far?","answer":"As a rule, subtracting the previous meter reading from the current meter reading gives the usage for that period. If a multiplier applies to the meter or the way the numbers are displayed is unclear, do not calculate it arbitrarily; instead, check the bill or guidance from the management office."},{"question":"Is the progressive rate system eliminated in July and August?","answer":"The progressive rate system is not eliminated; rather, the tier thresholds are relaxed for summer usage. Typically, Tier 1 applies to 300kWh or less, Tier 2 to 301–450kWh, and Tier 3 to more than 450kWh. The actual rates should be checked based on the contract type and the time of application."},{"question":"Does the August bill include only electricity used in August?","answer":"Not necessarily. Electricity charges are calculated based on each household's meter-reading cycle, so they generally include usage from the day after the previous month's meter-reading date through the current month's meter-reading date."},{"question":"What does it mean if an air conditioner consumes 1,000W of power? How much does it use in one hour?","answer":"If it operates continuously at around 1,000W for one hour, it theoretically uses 1kWh. An air conditioner's instantaneous power consumption varies depending on the compressor's operating status and inverter control, so 1kWh does not apply uniformly to its entire operating time."},{"question":"To calculate the additional electricity cost of an air conditioner, can I simply multiply its power consumption by the unit rate?","answer":"Residential electricity rates include progressive tiers and base charges, so multiplying by a single unit rate may result in a large error. It is more accurate to separately calculate the estimated bill for total usage excluding the air conditioner and the estimated bill including the air conditioner's usage, then compare the difference."},{"question":"Which has the lowest electricity cost: a window, portable, or wall-mounted air conditioner?","answer":"Electricity costs cannot be ranked based on product type alone. You must compare each product's rated power consumption, cooling capacity, energy efficiency, whether it has an inverter, room size, and installation conditions together."},{"question":"Why does the usage shown on KEPCO ON differ from the meter reading?","answer":"This may be due to delays in the transmission or aggregation of remote meter-reading data, the reference time used for the lookup, the meter multiplier, or differences in the meter-reading cycle. If the discrepancy persists or becomes significant, you should ask KEPCO or the apartment management office to verify the meter information and the applicable period."}],"sources":[{"url":"https://online.kepco.co.kr/MIM041D92","title":"KEPCO ON Preview of My Home Electricity Bill","type":"source"},{"url":"https://www.yeonsu.go.kr/main/community/notify/notice.asp?page=v\u0026seq=104626","title":"Yeonsu-gu Office Electricity Bill Information","type":"source"},{"url":"https://home.kepco.co.kr/kepco/front/html/WZ/2019_07_08/m/sub03_05.html","title":"Korea Electric Power Corporation Guide to Summer Residential Electricity Rate Tiers","type":"source"},{"url":"https://www.yna.co.kr/view/AKR20260727132000530","title":"Yonhap News Report on the Heat Wave, July 27, 2026","type":"source"}],"images":[{"id":437,"url":"https://injoys.com/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTE1OSwicHVyIjoiYmxvYl9pZCJ9fQ==--72a31d4059a7173e0a6ec858726816d90e562f01/ai-f614aa64.webp","is_representative":true,"generation_method":"ai_image","license":"ai_generated","mime_type":"image/webp","translations":{"ko":{"alt":"에어컨과 전력량계, 전기 사용량 그래프가 표시된 스마트폰과 동전 일러스트","caption":"스마트폰으로 에어컨 전력 사용량과 예상 전기요금을 확인하는 모습을 표현한 일러스트입니다.","description":null},"en":{"alt":"Air conditioner, electricity meter, smartphone with usage charts, and coins","caption":"The illustration shows air conditioner electricity use and estimated costs being checked on a smartphone.","description":null},"ja":{"alt":"エアコンと電力計、使用量グラフを表示したスマートフォン、硬貨のイラスト","caption":"スマートフォンでエアコンの電力使用量と予想電気料金を確認する様子を表しています。","description":null},"es":{"alt":"Aire acondicionado, medidor eléctrico, móvil con gráficos de consumo y monedas","caption":"La ilustración representa la consulta del consumo del aire acondicionado y el coste estimado en un móvil.","description":null},"id":{"alt":"AC, meter listrik, ponsel dengan grafik pemakaian, dan tumpukan koin","caption":"Ilustrasi ini menunjukkan pengecekan pemakaian listrik AC dan perkiraan tagihan melalui ponsel.","description":null},"pt":{"alt":"Ar-condicionado, medidor elétrico, celular com gráficos de consumo e moedas","caption":"A ilustração mostra a consulta do consumo do ar-condicionado e do custo estimado pelo celular.","description":null},"zh-hant":{"alt":"冷氣機、電表、顯示用電圖表的手機與硬幣插圖","caption":"插圖呈現透過手機查看冷氣用電量與預估電費的情境。","description":null},"de":{"alt":"Klimaanlage, Stromzähler, Smartphone mit Verbrauchsdiagrammen und Münzen","caption":"Die Illustration zeigt die Prüfung des Stromverbrauchs einer Klimaanlage und der geschätzten Kosten per Smartphone.","description":null}}},{"id":438,"url":"https://injoys.com/rails/active_storage/blobs/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTE2NSwicHVyIjoiYmxvYl9pZCJ9fQ==--322aadd5a1d505afda11b5ba7e0bf4f40d57f715/ai-c4d6a331.webp","is_representative":false,"generation_method":"ai_image","license":"ai_generated","mime_type":"image/webp","translations":{"ko":{"alt":"아파트 각 세대와 공용시설의 전력 사용량이 계량기로 연결되고 요금이 비교되는 일러스트","caption":"에어컨과 공용시설의 전력 사용량이 계량되어 예상 요금으로 표시되는 과정을 보여준다.","description":null},"en":{"alt":"Apartment units and shared facilities connected to an electricity meter with bill comparison cards","caption":"The illustration shows electricity use from air conditioners and shared facilities being metered and compared on bills.","description":null},"ja":{"alt":"集合住宅の各住戸と共用設備が電力メーターにつながり料金明細が比較されるイラスト","caption":"エアコンや共用設備の使用電力量を計測し、料金明細で比較する流れを示している。","description":null},"es":{"alt":"Viviendas y zonas comunes conectadas a un medidor eléctrico con tarjetas de comparación de facturas","caption":"La ilustración muestra cómo se mide y compara en facturas el consumo eléctrico del aire acondicionado y las zonas comunes.","description":null},"id":{"alt":"Unit apartemen dan fasilitas bersama terhubung ke meter listrik dengan kartu perbandingan tagihan","caption":"Ilustrasi ini menunjukkan pemakaian listrik AC dan fasilitas bersama yang diukur lalu dibandingkan dalam tagihan.","description":null},"pt":{"alt":"Apartamentos e áreas comuns ligados a um medidor elétrico com cartões de comparação de contas","caption":"A ilustração mostra o consumo elétrico do ar-condicionado e das áreas comuns sendo medido e comparado nas contas.","description":null},"zh-hant":{"alt":"公寓各住戶與公共設施連接至電表，並以帳單卡片比較用電費用的插圖","caption":"插圖呈現冷氣與公共設施的用電量經電表計量後，在帳單上進行比較。","description":null},"de":{"alt":"Wohnungen und Gemeinschaftsbereiche sind mit einem Stromzähler und Vergleichskarten für Rechnungen verbunden","caption":"Die Illustration zeigt, wie der Stromverbrauch von Klimaanlagen und Gemeinschaftsbereichen erfasst und abgerechnet wird.","description":null}}}],"published_at":"2026-08-03T06:29:20+09:00","updated_at":"2026-08-03T06:29:20+09:00","license":"cc_by","translation_status":"reviewed","available_locales":["ko","en","ja","es"],"data_locales":["ko","en","ja","es","id","pt","zh-hant","de"],"url":"https://injoys.com/en/articles/kepco-on-electricity-usage-estimated-bill-guide"}