South Korea Energy Market Guide 2026

Contents (12)▾

South Korea has a highly reliable power system, but understanding energy costs for a factory is not as simple as looking up one electricity price.

Industrial electricity charges vary by contract demand, voltage, tariff option, season and time of use. Renewable electricity can be procured through several different mechanisms, each with a different cost and contract structure. Carbon pricing and supply-chain requirements add another layer of complexity.

This guide explains how the main parts of South Korea's corporate energy market fit together and what global manufacturers, Korean subsidiaries and companies sourcing from Korean suppliers should check before making an energy decision.

Korea Energy Market in 60 Seconds

Key Numbers

1. How South Korea's Electricity Market Works

South Korea's wholesale electricity market is operated by the Korea Power Exchange, or KPX. KPX operates the electricity market and power system, including bidding, market pricing, settlement, dispatch and real-time system operation.

KEPCO plays a different role. It operates major transmission and distribution infrastructure and sells electricity to end users under regulated retail tariff structures.

A simplified view is:

1. Power generators
   ↓→
2. KPX wholesale marketWholesale market price → SMP
   ↓→
3. KEPCO/grid
   ↓→
4. electricity usersRetail tariff → Electricity bill

OFFICIAL DATA

SMP is not a factory electricity tariff

SMP, or System Marginal Price, is a wholesale electricity market price determined through the power market.

The August 2026 integrated monthly SMP was KRW 148.39/kWh.

That does not mean a Korean factory paid KRW 148.39/kWh for electricity. A factory's bill is determined through the applicable retail tariff and other billing components.

Source type: OFFICIAL DATA — KPX

Sources

• Korea Power Exchange (KPX) — monthly SMP, August 2026

2. How Industrial Electricity Tariffs Work in South Korea

There is no single electricity rate for a factory in South Korea

A simple country-level average can be useful for comparison, but it cannot tell a manufacturer what a specific Korean facility will actually pay.

OFFICIAL DATA

KEPCO reported an average industrial electricity selling price of KRW 181.90/kWh for 2025.

This covered industrial customers with many different voltage levels, tariff structures and load profiles. It should therefore be treated as a statistical average, not as a universal factory tariff.

Source type: OFFICIAL DATA — KEPCO

Sources

• EPSIS (Korea Power Exchange) — KEPCO electricity sales unit price by contract type, FY2025

1. Contract demand
2. +Voltage level
3. +Tariff category and option
4. +Energy consumption
5. +Season
6. +Time of use
7. +Fuel-cost adjustment and other charges

=Actual electricity bill

For energy-intensive manufacturing sites, analyzing only annual consumption can miss important cost drivers.

What changed in 2026?

OFFICIAL DATA

KEPCO changed the time-of-use structure for Industrial Service B in 2026.

The published reform reduced peak-period energy charges by an average of KRW 15.4/kWh, while increasing off-peak charges by KRW 5.1/kWh.

Peak-period reductions were:

• KRW 16.9/kWh in summer and winter
• KRW 13.2/kWh in spring and fall

The reform also introduced a 50% energy-charge discount between 11:00 and 14:00 on eligible weekends and public holidays during spring and fall for Industrial Service B customers.

Source type: OFFICIAL DATA — KEPCO

Sources

• Ministry of Climate, Energy and Environment — briefing on the seasonal and time-of-use electricity tariff reform, April 16, 2026
• KEPCO — Basic Supply Terms and Enforcement Rules (official regulations board)

OPENENERGY ANALYSIS

Why Load Timing Matters

The published tariff change can be translated into a simple scale example.

For every 1 GWh of electricity consumption:

Illustrative energy-charge effect per 1 GWh, by load timing

Load timing	Illustrative energy-charge effect
Off-peak period	+KRW 5.1 million
Peak period — published average	−KRW 15.4 million
Summer/Winter peak	−KRW 16.9 million
Spring/Fall peak	−KRW 13.2 million

Off-peak period

+KRW 5.1 million

Peak period — published average

−KRW 15.4 million

Summer/Winter peak

−KRW 16.9 million

Spring/Fall peak

−KRW 13.2 million

This is an illustrative calculation of the change in the energy-charge component only.

It does not represent the total electricity bill and excludes demand charges, other tariff components, taxes and changes in operating behavior.

The practical point is simple: annual electricity consumption alone is not enough. When a factory consumes electricity can materially affect the result.

Calculation basis:

1 GWh = 1,000,000 kWh

Example:

1,000,000 kWh × KRW 15.4/kWh = KRW 15.4 million

Calculation: OpenEnergy Research

Underlying source: KEPCO 2026 tariff reform

3. K-RE100 and Renewable Electricity Procurement in South Korea

What is K-RE100?

OFFICIAL DATA

K-RE100 is South Korea's renewable electricity use verification framework.

It allows eligible electricity consumers to use recognized renewable electricity procurement methods and receive renewable energy use confirmation documentation through the Korean system.

Participation is not limited to companies that are members of the global RE100 initiative.

Source type: OFFICIAL DATA — Korea Energy Agency / K-RE100

Sources

• Korea Energy Agency, New and Renewable Energy Center — K-RE100 system overview

K-RE100 and global RE100 should not be treated as identical

K-RE100

K-RE100 provides a domestic system for documenting renewable electricity use.

≠

Global RE100

The global RE100 initiative is an international corporate initiative with separate membership and technical requirements.

A company therefore needs to ask not only whether a procurement method is recognized under K-RE100, but also what type of renewable electricity claim its headquarters, customer or reporting framework actually requires.

Five renewable electricity procurement methods

The Korea Energy Agency recognizes five main K-RE100 implementation methods.

OFFICIAL DATA

South Korea has also been expanding PPA market infrastructure.

In July 2026, the government announced a PPA brokerage pilot involving 43 companies and industry associations, with prospective supply and demand volumes estimated at approximately 1 GW each.

The platform officially launched in August, alongside initial solar and wind PPA-related agreements totaling approximately 210 MW.

Source type: OFFICIAL DATA — Korean government

Sources

• Ministry of Climate, Energy and Environment — PPA brokerage pilot launch, July 15, 2026
• Ministry of Climate, Energy and Environment — PPA brokerage platform official launch (Korean), August 27, 2026

4. What Does Renewable Electricity Procurement Actually Cost?

OPENENERGY ANALYSIS

Reference cost for 1 GWh, 10 GWh and 100 GWh

The 2026 first Green Premium tender recorded an average successful bid price of:

KRW 10.017/kWh

The K-RE100 consumer REC market displayed an average price of:

KRW 78,831/MWh on September 2, 2026

Using those reference prices:

Procurement reference cost by renewable electricity volume

Renewable electricity volume	Green Premium reference	Consumer REC market reference
1 GWh	KRW 10.017 million	KRW 78.831 million
10 GWh	KRW 100.17 million	KRW 788.31 million
100 GWh	KRW 1.002 billion	KRW 7.883 billion

These figures are procurement reference costs—not total electricity costs.

They do not include the underlying electricity bill and should not be treated as quotations or guaranteed future procurement prices.

They also should not be interpreted as proving that one procurement method is universally better than another.

Different mechanisms provide different contract structures, renewable energy claims, risk profiles and links to renewable generation.

Calculation: OpenEnergy Research

Underlying references:

• Green Premium: 2026 first tender average
• Consumer REC: September 2, 2026 market reference

Sources

• KEPCO EN:TER — 2026 first Green Premium tender results, 2026 first tender
• K-RE100 Renewable Energy Use Management System (Korea Energy Agency) — consumer REC market, September 2, 2026

OPENENERGY ANALYSIS

Example: A 10 GWh Factory Receives a 50% Renewable Electricity Requirement

1. Annual electricity use10 GWh
   ↓→
2. Renewable electricity target50%
   ↓→
3. Renewable electricity required5 GWh

• GREEN PREMIUM

  5,000,000 kWh × KRW 10.017/kWh

  ≈ KRW 50.1 million/year

• CONSUMER REC

  5,000 MWh × KRW 78,831/MWh

  ≈ KRW 394.2 million/year

• PPA

  Contract-specific

• SELF-GENERATION

  Site-specific

The target defines how much renewable electricity is needed. It does not determine how the company should procure it.

These calculations exclude the underlying electricity bill and other applicable costs.

Calculation: OpenEnergy Research

5. Korea ETS, Carbon Costs and CBAM

Electricity cost, renewable electricity procurement and carbon exposure are related, but they are not the same calculation.

South Korea operates an emissions trading system, and allowances are traded through the Korea Exchange.

For companies exporting certain goods to the European Union, the EU Carbon Border Adjustment Mechanism adds another consideration.

As of September 30, 2026:

KOREA ETS

KAU26

KRW 30,000/tCO₂

Source type: OFFICIAL DATA — KRX

≠

As of September 30, 2026, the latest officially published 2026 CBAM certificate price was:

EU CBAM

€75.28/tCO₂

Reference: Q2 2026

Source type: OFFICIAL DATA — European Commission

These values are not directly subtractable.

CBAM calculations depend on the relevant covered goods, embedded emissions, applicable rules and evidence of carbon prices effectively paid in the country of origin.

Companies should therefore separate three questions:

1. What electricity emissions are associated with the facility?
2. What renewable electricity claim is being pursued?
3. Is the company's product or supply chain directly exposed to carbon-pricing or CBAM requirements?

6. What This Means for Global Manufacturers

Different companies need different information from the Korean energy market.

If You Already Operate a Factory in South Korea

Start with:

Tariff + load profile

Check:

• tariff category and voltage level
• contract demand
• selected tariff option
• 15-minute or interval load profile
• peak demand
• operating hours
• seasonal consumption
• renewable electricity requirements

A factory with the same annual electricity consumption as another facility can still have a different cost profile because its demand and time-of-use pattern is different.

If You Are Planning a New Factory in South Korea

Start with:

Demand + location + renewable availability

Consider:

• expected contract demand
• supply voltage
• production schedule
• expected load profile
• renewable electricity availability
• location

POLICY WATCH

PROPOSED — NOT A CURRENT TARIFF

Regional Industrial Electricity Pricing

In August 2026, the Korean government released a proposed regional industrial electricity pricing design covering 11 regions.

The proposal would introduce a regional adjustment component and reduce industrial electricity prices in some non-metropolitan regions by up to approximately 10% under the proposed design.

The most favorable proposed adjustment was approximately:

KRW 18/kWh

relative to the 2025 industrial average selling price.

The government stated an objective of introducing the system within 2026.

This is a policy proposal, not a current tariff.

OPENENERGY ANALYSIS

If a KRW 18/kWh adjustment were eventually applicable, its theoretical scale would be:

Illustrative annual difference of a KRW 18/kWh adjustment

Annual consumption	Illustrative annual difference
1 GWh	KRW 18 million
10 GWh	KRW 180 million
100 GWh	KRW 1.8 billion

These are illustrative calculations, not forecasts of realized savings.

Location could become a more important energy-cost factor for future manufacturing investment.

Sources

• Ministry of Climate, Energy and Environment (Korea Policy Briefing) — proposed regional industrial electricity pricing design (Korean), August 26, 2026

If You Source from Korean Suppliers

Start with:

Claim requirement + accepted procurement methods

Do not begin by asking the supplier only whether it is “RE100 compliant.”

Instead, define the requirement.

Ask:

• What percentage of electricity must be renewable?
• By what year?
• Which procurement instruments are acceptable?
• What documentation is required?
• Does the buyer require global RE100-aligned reporting, K-RE100 documentation, or a customer-specific standard?
• Is the requirement facility-specific or company-wide?

This distinction can materially change the procurement strategy.

OFFICIAL / INSTITUTIONAL DATA

Climate Group's September 2026 disclosure report found that renewable energy accounted for:

12% of RE100 members' energy use in South Korea

This is a metric for RE100 members operating in South Korea.

It is not South Korea's national renewable electricity share.

Source type: OFFICIAL / INSTITUTIONAL DATA — Climate Group

Sources

• 2025 RE100 Annual Disclosure Report, published September 2026 — Climate Group

If You Operate a Korean Subsidiary of a Global Company

Start with:

HQ requirement + local procurement structure

A Korean subsidiary may need to coordinate:

• local K-RE100 documentation
• global sustainability reporting
• headquarters procurement criteria
• budget and contract duration
• local PPA feasibility
• supplier or customer requirements

The cheapest short-term renewable electricity option is not automatically the option that best meets a company's reporting or procurement objective.

7. Korea Energy Market Indicators — September 2026

SMP is not a retail tariff.

Green Premium is an incremental renewable electricity procurement charge.

REC is a certificate-market reference.

KAU and CBAM relate to different carbon-pricing systems.

8. Five Questions to Ask Before Making an Energy Decision in South Korea

1

1. What tariff, voltage level and contract demand apply to the site?

This determines the basic framework through which the facility is billed.

2

2. When does the facility actually consume electricity?

Annual kWh alone can hide important time-of-use and demand effects.

3

3. What renewable electricity claim must the company satisfy?

The answer may differ depending on whether the objective is:

• K-RE100 documentation
• global RE100 reporting
• a customer's supply-chain requirement
• an internal corporate target

4

4. What is the actual objective?

Possible objectives include:

• reducing electricity cost
• procuring renewable electricity
• meeting customer requirements
• reducing reported emissions
• managing longer-term price risk

These objectives are related, but they are not identical.

5

5. What contract duration and price risk can the company accept?

Green Premium, REC, PPA and self-generation have different levels of commitment, market exposure and operational complexity.

Frequently Asked Questions

How much does electricity cost for a factory in South Korea?

There is no single electricity price that applies to all factories in South Korea.

A manufacturer's bill can vary according to contract demand, voltage level, tariff category, tariff option, season and time of use.

KEPCO reported a 2025 average industrial selling price of KRW 181.90/kWh, but this is a statistical average across many customers and should not be used as a quotation for an individual facility.

The best way to estimate a factory's electricity cost is to identify its applicable tariff and analyze its actual or expected load profile.

How does South Korea's industrial electricity tariff work?

Industrial electricity bills normally combine demand-related charges and energy charges.

The energy-charge component can vary by season and time of use for relevant tariff classes.

South Korea changed parts of its industrial time-of-use structure in 2026.

For Industrial Service B, published peak charges were reduced while off-peak charges increased.

This means two factories with similar annual consumption can still have different energy costs if their operating hours, peak demand or tariff conditions differ.

What is K-RE100?

K-RE100 is South Korea's renewable electricity use verification framework.

The Korea Energy Agency recognizes five main implementation methods:

• Green Premium
• REC purchases
• third-party PPA
• direct PPA
• self-consumption

Participation is not limited to companies that are members of the international RE100 initiative.

Is K-RE100 the same as global RE100?

No.

K-RE100 is a Korean renewable electricity use verification system.

Global RE100 is an international corporate initiative with its own membership and technical criteria.

K-RE100 documentation can be relevant to corporate renewable electricity reporting, but companies should confirm the exact requirements of their headquarters, customer or reporting framework rather than assuming that the two systems are interchangeable.

What is the difference between Green Premium and REC in Korea?

Green Premium allows an electricity consumer to pay an additional renewable electricity premium through KEPCO.

REC procurement allows a company to purchase eligible renewable energy certificates through the consumer REC market and use them within the K-RE100 framework.

Both can support renewable electricity use claims, but their pricing mechanisms and procurement structures differ.

Their market prices should therefore be treated as separate indicators rather than directly interchangeable products.

Can a foreign company sign a PPA in South Korea?

Foreign ownership by itself does not describe whether a Korean facility can use a particular PPA structure.

The relevant issue is the Korean electricity-consuming entity, site and applicable regulatory and contractual conditions.

South Korea currently provides third-party and direct PPA mechanisms under its renewable electricity framework.

The government also launched a PPA brokerage platform in 2026 to improve matching between renewable electricity suppliers and buyers.

A company considering a PPA should confirm its site eligibility, expected load, required renewable electricity volume and contract terms.

How much does renewable electricity procurement cost in South Korea?

It depends on the procurement method.

Using the 2026 first Green Premium tender average, 1 GWh corresponds to an illustrative additional premium of approximately:

KRW 10.0 million

Using the September 2, 2026 K-RE100 consumer REC market reference, 1 GWh corresponds to approximately:

KRW 78.8 million

in certificate reference value.

These calculations exclude the underlying electricity bill and should not be treated as guaranteed procurement prices.

PPA and self-generation costs require contract- or site-specific analysis.

How can a Korean supplier respond to an RE100 request from a global customer?

The supplier should first clarify the customer's actual requirement.

A request for “50% renewable electricity,” for example, should specify:

• the target year
• covered facilities
• acceptable procurement methods
• required evidence

The supplier can then compare K-RE100 options such as Green Premium, REC, PPA and self-generation.

The lowest-cost option may not always provide the documentation, contract duration or project linkage that the customer expects.

The procurement decision should therefore begin with the requirement, not with the product.

Is renewable electricity more expensive in South Korea?

There is no single renewable electricity premium that applies to every company.

Green Premium and REC have observable reference prices, while PPA prices depend on individual contracts and self-generation depends heavily on site conditions.

Companies should compare procurement options based on both cost and the renewable electricity claim they need to make.

What should a company consider before building a factory in South Korea?

Energy planning should consider more than the national average electricity price.

A company should estimate:

• contract demand
• required voltage
• production schedule
• hourly load profile
• peak demand
• renewable electricity needs
• available procurement options

Location may also become more important.

In August 2026, the Korean government proposed a regional industrial electricity pricing framework that could create differences among regions, although the proposal was not yet a current tariff as of September 30.

For large electricity users, energy should therefore be evaluated as part of site-selection economics rather than after a factory location has already been chosen.

Methodology and Sources

This guide prioritizes publicly available information from primary or institutional sources, including:

• Korea Electric Power Corporation — KEPCO
• Korea Power Exchange — KPX
• Korea Energy Agency / New and Renewable Energy Center
• K-RE100 Renewable Energy Use Management System
• Korea Exchange — KRX
• Korean government
• European Commission
• Climate Group / RE100

Market values are shown with their reference dates wherever possible.

OFFICIAL DATA

Values directly reported by public agencies, market operators or recognized institutional sources.

OPENENERGY ANALYSIS

Calculations created from cited official or institutional data.

Examples include:

1 GWh × reference price

and:

Annual electricity consumption × renewable electricity target

These calculations are illustrative and are not quotations, forecasts or guaranteed savings.

POLICY WATCH

Policies that have been officially proposed or announced but are not yet treated as current tariffs or final market rules.

Because electricity prices, REC markets, carbon prices and policy conditions change over time, users should confirm the latest values before making a commercial decision.

About OpenEnergy

OpenEnergy is a South Korea-based energy technology company that helps manufacturers turn electricity and renewable energy data into practical energy decisions.

The company focuses on:

energy data + analysis + decision support

including electricity cost analysis, load-pattern analysis, tariff assessment and renewable electricity procurement decision support.

Rather than treating annual electricity consumption as a single number, OpenEnergy works to identify how tariff structure, demand, operating time and renewable energy requirements affect the decisions of an individual manufacturing site.

Need to understand the energy profile of a Korean facility?

OpenEnergy analyzes electricity costs, load patterns and renewable electricity procurement options for manufacturing sites in South Korea.

Talk to OpenEnergyExplore Korea Energy Data