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Relative to the average change during 08:00–11:00 and 14:00–17:00
Points represent one-hour blocks in KST. Whiskers are pointwise 95% confidence intervals, not simultaneous bounds for all 24 hours. The reference-hour average is zero by construction. Adding these points does not measure additional daily charging.
Midday versus nearby-hour contrasts; the selected comparison and phase
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Points and 95% confidence intervals
Select a row to inspect that region. Intervals are pointwise; adjusted regional p-values appear in the details.
Separate estimates are not a formal test of whether slow and fast chargers respond differently.
Spring 2026 · weekends and eligible holidays · 11:00–14:00 KST. Dates below are inclusive and begin with the first eligible day. Cash amounts are KRW per kWh; points are shown separately. The advertised 50% electricity-rate reduction did not mean a uniform 50% discount on retail charging prices.
Scroll the table sideways to see discounts and conditions.
| Company / CPO code | Period, 2026 | Discount or promotional rate | Coverage and key conditions |
|---|---|---|---|
| Ministry · 환경부/기후부ME | Apr 18–May 31 | −₩48.6 Sat / −₩42.7 Sun & holidays Below 100 kW: ₩275.8 / ₩281.7 100 kW+: ₩298.6 / ₩304.5 | Published public fast-charger offer; Ministry/direct-card channels. Applies to energy within the window. Slow-coded ME implementation remains unconfirmed. |
| KEPCO · 한전KP | Apr 18–May 31 | Public: same reductions/rates as ME Apartments: −₩45.5 Sat / −₩40.1 Sun & holidays | Public and apartment chargers, including slow. Energy within the window; apartment net price depends on the applicable tariff. Nominal effective date Apr 16. |
| Everon · 에버온EV | Apr 18–May 31 | Fast: ₩148 (50% off Basic ₩296) Slow: −₩50 Basic ₩296→₩246; AI/Smart ₩276→₩226 | Own members; contract/subsidy exceptions. Temporary holidays excluded. May 27 Smart expansion retains the ₩148 fast offer. Nominal start Apr 16. |
| VoltUp · 볼트업LU | Apr 18–May 31 | ₩318→₩270 ₩48 reduction from ordinary slow rate | Own slow chargers and members; roaming and medium/fast excluded. Substitute holidays excluded, including May 25. Energy within the window. |
| PowerCube · 파워큐브PW | Apr 18–May 31 | −₩50 Net rate depends on site tariff | Fixed slow chargers; negotiated-contract sites and roaming excluded. Substitute holidays included; temporary holidays excluded. Energy within the window. |
| NICE Charger · 나이스차저NT | Apr 18–May 31 | 40.5–48.6 points/kWh Varies by station; credited next month | Own members, fast and slow; nonmembers/roaming excluded. Points expire after six months. Deferred reward, not an immediate cash-price cut. |
| Seoul CNG · 서울씨엔지CG | Apr 18–May 31 | 50 points/kWh Credited next month | Own members, fast and slow; taxi-company sites excluded. Deferred reward, not an immediate cash-price cut. |
| CHAEVI · 채비CV | May 1–31 | −₩50 | Selected fast chargers at 10 campaign sites; 44 outlets matched in the dataset. Own-member authentication; V-members/ChaeviPass excluded. Session must start within 11:00–14:00. |
| Water · 워터BE | May 16–Jun 28 | −₩56 | 25 selected sites, fast and slow; own members, payment ≥₩100. Ministry-card/nonmember use excluded. Payment must complete within 11:00–14:00. |
ME rate pairs are Saturday / Sunday-or-holiday. Company names link to the Korean primary notices. For Everon, NICE and Seoul CNG, the precise handling of sessions crossing the time boundary was not independently established. Published offers do not establish the price paid by each observed session.
Current models: broader treatment uses ME, KP, EV, LU, PW, NT and CG. The public comparison treats ME/KP as the public group. CHAEVI and Water are listed here for context; they are not in the seven-cohort broader model.
| Company / code | Recorded spring information | Unresolved detail |
|---|---|---|
| Seoul municipal chargers · SE/SN | Offer reported from May 9 | City-owned site roster must be matched; eligibility cannot be assigned to every SE/SN charger or every charger in Seoul. |
| EVSIS · JA | Participation reported; prior notice requires both start and end within 11:00–14:00 | Exact spring start and eligible station list were not established. |
| KEVIT · KE | May fast-charger offer candidate | April start unconfirmed; the notice was revised in August. |
| GS ChargeV · PI | Spring offer reported | Primary dated eligibility was not established. |
| Pluglink · PL | Participation unconfirmed | Spring dates and scope were not established. |
These unresolved records are not proof of nonparticipation. No new treatment assignment is made by this appendix.