Korail Urges Grid Reforms to Reflect Regenerative Power Value
Korail is advocating for reforms to Korea's electricity metering and tariff systems to reflect the value of regenerative power returned to the grid. This comes as its 2025 electricity bill reached 632.2 billion KRW, a 71.5% increase from 2021, far outpacing its 4.3% usage growth.
Our take
Will Korea credit large users for power returned to the grid, and does it help on-site storage?
This is a metering and billing dispute worth roughly 3 to 6% of Korail's power bill, not a new revenue line for storage: Korail's own estimates of the gain run from over KRW 20 billion to KRW 35.2 billion a year, against a KRW 632.2 billion bill.
Korail says the current metering does not credit the power its trains return to the grid, and reports a 6.3% gap between KEPCO's and KPX's metering methods. It wants offsetting and new metering and is taking the question to the Electricity Commission. The savings it cites, over KRW 20 billion here and KRW 35.2 billion in figures submitted to a lawmaker earlier this month, would come off its own bill, not from payment for grid services; the 3 to 6% share is our calculation. The planned 1 MWh battery at one substation is for capturing regenerative energy and cutting peaks, and Korail says payback and safety will be checked before wider use.
What the source says
- Korail is demanding offset processing and improved metering methods to reflect both electricity use and supply.
- Korail plans to install and operate a 1 MWh Energy Storage System (ESS) at the Seokhang Electric Substation for regenerative energy storage and peak suppression.
- Expansion of ESS requires verification of investment recovery period, safety, and charge/discharge performance, especially its effectiveness in absorbing concentrated regenerative power during train braking.
- The current metering and settlement system does not adequately reflect the value of power returned to the grid.
- A comparison of metering methods between KEPCO and KPX revealed an approximate 6.3% difference in electricity volume.
- Technical responses like economic driving and maximum demand power management must be combined with improvements in metering and tariff systems to reduce railway electricity costs.
- Korail is pursuing judgment procedures through the Electricity Regulatory Commission regarding its demands for system improvement.
For investors — Storage investors: Read this as one large customer's billing case. If the commission backs offsetting, the value goes to Korail's bill; the precedent matters mainly to other large users that return power, not to market revenue for storage.
Battery suppliers: The near-term order is a single 1 MWh unit. Wider rollout waits on payback and safety checks Korail has not completed.
Watch: Monitoring the Electricity Regulatory Commission's response to Korail's demands for metering and settlement system improvements.
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