KEPCO facility contribution calculator: Checking electric connection assumptions — Worked Scenario

What this scenario actually checks

Estimate the contribution paid to KEPCO for an ordinary new connection or capacity increase. The calculation uses the application-date bands in Annex 4 of the 2026-08-01 supply terms, rather than an old online calculator rate. Basic contribution, new-route distance contribution and VAT are shown separately; internal building work is a different cost.

This walkthrough focuses on checking electric connection assumptions. It follows the published tool inputs, not a new formula or an automatically verified legal, financial, medical or engineering determination.

Start by preparing the right inputs

Select confirmed low-voltage or high/extra-high supply up to 22.9 kV, overhead/underground route and phase. High-voltage mode requires three-phase. Enter whole-kW new or target total capacity. Ordinary low-voltage increases require an existing contract of at least 5 kW and unchanged supply conditions; smaller-contract exceptions are not modeled.

Before copying the example, confirm that each entered unit, date, dimension and default matches your real task. Changing only a visible number without revisiting its assumptions can change what the answer means.

• Select confirmed low-voltage or high/extra-high supply up to 22.9 kV, overhead/underground route and phase. High-voltage mode requires three-phase.
• Enter whole-kW new or target total capacity. Ordinary low-voltage increases require an existing contract of at least 5 kW and unchanged supply conditions; smaller-contract exceptions are not modeled.
• New low voltage: first 5 kW costs KRW 306,000 overhead or 588,000 underground, plus KRW 121,000 or 141,000 per extra kW. Ordinary increases apply the extra-kW rate to the increase. High voltage uses KRW 24,000 or 50,000 per new/increased kW.

Worked example with the calculator

Use the following input values: New low-voltage overhead; 10 kW; no distance charge.

The example output is KRW 911,000 + VAT 91,100 = 1,002,100. 306,000 + (10−5) × 121,000 is the basic contribution.

Treat this as a reproducible example, not a result to reuse with different measurements.

What can change the answer

New low voltage: first 5 kW costs KRW 306,000 overhead or 588,000 underground, plus KRW 121,000 or 141,000 per extra kW. Ordinary increases apply the extra-kW rate to the increase. High voltage uses KRW 24,000 or 50,000 per new/increased kW. For a new-route charge, enter confirmed calculation distance. Free distance is 200 m overhead or 50 m underground; sub-metre excess is discarded. Mixed routes, conductor additions, relocations, temporary/special supplies and internal work require separate assessment. VAT 10% is added.

The numerical result is valid only under the stated model and input definitions.

Before using the result for a real decision

For checking electric connection assumptions, check the original measurements and input units, and save the assumptions alongside any number you share.

Where legal rules, official allowances, equipment ratings or contractual conditions matter, consult their current authoritative documents. An illustrative estimate is not a substitute for that verification.

• Reproduce the example before changing inputs
• Check all units and assumptions, including any default values
• Verify official or manufacturer-specific requirements outside the calculator