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Electricity costs

Five Ways to Cut a Korean Industrial Electricity Bill Without Buying Equipment

Key summary

Before investing in solar or new equipment, here are five ways to cut electricity costs just by changing how you operate. This piece covers peak load spreading, using off-peak nighttime hours, power factor improvement, contract power optimization, and standby power management, from a factory operations standpoint. Most of these can be applied starting today at no extra cost.

Electricity costs · June 5, 2026 · 3 min read

Contents (5)

"Our electricity bill is far too high" — it is the line we hear most often on manufacturing sites these days. KEPCO raised industrial electricity rates three times between 2022 and 2024, and the cumulative increase comes close to KRW 50 per kWh. For a factory whose monthly bill used to be KRW 20 million, that means it now pays considerably more for the same consumption.

The bottom line

Before you replace equipment or install solar, there are more sites than you would expect where changing nothing but the way you operate can cut 10 to 30%. The five items below can be applied straight away at most sites with no extra cost, or at minimal cost.

Why operational improvement comes first

An industrial electricity bill breaks down into the basic charge (contract power and maximum demand), the energy charge (unit prices by time of day), and the power factor charge. Once you understand that structure, you can plug the points where money is leaking one by one without spending much. The figures below organise ranges observed in actual consulting work as illustrative examples, and the actual saving varies with your process, operating pattern, and the age of your equipment.

10~30%

Saving range achievable through operational improvement alone

50KRW/kWh

Cumulative industrial rate increase, 2022–2024

0KRW

Up-front investment for most of these methods

Five ways to save without investing in equipment

Impact · Most can be applied through operating instructions and inspection alone (figures are assumption-based examples)

1. Stop starting everything at once at the beginning of the shift

Gain

A single peak decides a full year of charges

  • Lighting, HVAC, and equipment all switched on together at the start of the shift → an instant peak explodes
  • The basic charge is based on the highest peak (maximum demand) over the past 12 months
  • Simply staggering equipment start-up at 15 to 20 minute intervals brings the peak down noticeably
  • Solved with one operating instruction, at no extra cost

2. Make use of the late-night hours

Gain

When you use it swings the unit price by up to three times

  • The energy charge unit price gap between weekday daytime (peak) and late night (off-peak) is more than three times at most
  • Move flexible processes (mould pre-heating, paint drying, compressors and the like) to after 11 pm
  • For processes that can run 24 hours, there are cases of 10 to 20% off the monthly bill
  • A low-cost improvement that only requires adjusting the production plan

3. Check your power factor

Gain

Stop the surcharge that quietly drains away

  • A power factor of 90% or above earns a discount; below that, a surcharge
  • Ageing motors, transformers, and fluorescent lighting are the main culprits dragging the power factor down
  • Left alone, a surcharge of hundreds of thousands to a few million won accumulates every month
  • The payback period on installing power factor correction capacitors is relatively short, at six months to a year

4. Review whether your contract power is right

Gain

You pay every month for capacity you never use

  • Contract power (kW) is the basis of the basic charge
  • Excessive contracts are often left in place after an expansion or an equipment replacement
  • Too low, and you get an excess surcharge → optimise against actual use over the past 12 months
  • Setting the right level accurately calls for an expert simulation

5. Manage standby power

Gain

The bill still arrives on weekends when nothing is produced

  • Compressors, cooling towers, temperature and humidity units, and lighting run even at times when they are not needed
  • A per-equipment shut-off checklist before leaving for the day alone saves 5 to 10% a month
  • Smart distribution boards and remote shut-off devices manage this more effectively
  • The fastest way to reduce your baseline consumption on non-working days

Where should you start

How many of the five above could you apply right now? If even one of them made you think "that has not been handled at our factory", that is a signal that unnecessary cost is already going out every month.

The power factor (method 3) and contract power (method 4) in particular reveal whether you are losing money just from looking at the bill, so they are worth checking first. If the power factor on your bill is 90% or below, or if the maximum demand differs greatly from the contract power, that is a situation calling for immediate action.

Saving does not start with a grand equipment investment. It starts with knowing exactly where the leak is.

If the burden is still heavy after you have applied every operational improvement, that is the point at which to look at renewable conversion such as self-generated solar or a direct PPA. Measures that require investment have to be judged after operational savings have lowered the baseline; only then is the payback calculation accurate.

Questions we are often asked

Does operational improvement alone really cut 10 to 30%?

It varies by factory. Sites where peak management and the power factor are already in good shape have little room; conversely, the older the site and the longer it has gone untouched, the larger the saving. The exact figure only emerges once you look at 12 months of data. The figures above are ranges observed in actual cases, given as examples.

If we lower contract power and then exceed it, is the surcharge not large?

That is exactly why you must not lower it arbitrarily. Using the maximum actual use over the past 12 months as the basis, you have to weigh the risk of exceeding it against the saving on the basic charge to find the right level. A simulation is the most accurate way to do this part.

How do we check the power factor?

Look at the "power factor charge" item and the power factor figure on your electricity bill. Below 90% means a surcharge is being applied, so that is the point to consider installing power factor correction capacitors.

In summary

Here is the order in which you can start without investing in equipment.

  1. Check the power factor and contract power on the bill (an immediate read on whether you are losing money)
  2. Identify the cause of the maximum demand peak → spread out the simultaneous start-up
  3. Move flexible processes to the late-night hours to cut the unit price
  4. Run a standby power shut-off checklist before leaving for the day
  5. If the burden is still heavy after all of this, look at renewable conversion

Cutting an electricity bill starts with how much you know. Pin down exactly where the leak is, and most of it can be reduced right now at no extra cost.

Note: The saving rates in the text (10–30%, 10–20%, 5–10% and so on) and the payback periods organise ranges observed in actual consulting work as assumption-based examples provided to aid understanding; the actual effect varies with the process, operating pattern, age of equipment, and contract terms. An on-site diagnosis based on 12 months of power data is needed before applying them.

OpenEnergy Editorial Team

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