Reading Your KEPCO Bill After Installing a Mining Rig

The first full month after plugging in a mining rig surprises many first-time buyers. Your KEPCO bill jumps, sometimes pushing you into a higher rate tier. Understanding how the bill is structured helps you predict costs before you buy hardware.

How KEPCO Residential Billing Works

Residential electricity in South Korea uses a progressive tier system. The more kilowatt-hours you consume in a month, the higher the rate per kWh for usage above each threshold. Adding a rig that runs 24/7 at 350 W contributes roughly 252 kWh per month — enough to push many households from tier 2 into tier 3 pricing.

What to Look For on Your Bill

After your rig has run for a full billing cycle, compare these line items against your pre-rig bills:

• Total kWh used: Should increase by approximately (rig wattage ÷ 1000) × hours operated × 30
• Tier breakdown: Check whether your total usage crossed a tier boundary. A 50 kWh increase might cost more than 50 × the base rate if it pushes you into a higher tier.
• Climate charge: Summer months (July–August) add a surcharge that amplifies the cost of running a heat-producing device.

A Worked Example

A Seoul household using 250 kWh/month before mining installs a 0.05 TH/s rig drawing 340 W at 220 V, running 24/7.

Additional usage: 0.34 kW × 24 hours × 30 days = 244.8 kWh New total: approximately 495 kWh

At 495 kWh, this household likely enters tier 3 pricing for a portion of their usage. The rig alone might add ₩55,000–₩72,000 to the monthly bill, depending on the exact tier crossover and seasonal charges.

Reducing the Impact

• Run the rig during off-peak hours only (reduces kWh but also reduces hash output)
• Improve ventilation so the rig does not throttle and waste power on rejected heat
• Choose a lower-wattage model — the difference between 310 W and 380 W at 0.05 TH/s is meaningful over a month

For a personalised projection, request our power cost estimation report.