Hour 21 · 2026-05-29
Illustrative clearing — production MMS would use a SCED-class optimiser.
In hour 21, the SMP cleared at R845.94 / MWh. The marginal offer was Eskom Holdings — coal fleet (Generator)'s — the last unit of generation needed to meet demand. By uniform-price rule, every accepted seller was paid R845.94 / MWh for their share of the 26000 MWh cleared this hour.
See the in-browser verifier to confirm the SMP from the receipt's canonical inputs.
Supply curve · demand intersection
The supply curve (terracotta) is cumulative MWh on the x-axis, offer price on the y-axis. The dashed green line is hourly demand. Where they cross is the SMP.
Accepted awards
| Offer | Party | MWh awarded | Price (R/MWh) |
|---|---|---|---|
| o-21-renew-agg | Aggregator — renewables pool | 300.0 | R845.94 |
| o-21-wind | IPP — wind plant (Generator) | 1608.0 | R845.94 |
| o-21-coal | Eskom Holdings — coal fleet (Generator) | 24092.0 | R845.94 |
Show full computation transcript
[clearHour] day=2026-05-29 hour=21 seed=42 [clearHour] tieBreak=price_asc → ts_asc → party_id_asc [clearHour] demand_mw_min=1560000 [clearHour] accept offer=o-21-renew-agg party=agg_renewables_01 price=39309c volume=18000 cumulative=18000 [clearHour] accept offer=o-21-wind party=gen_ipp_wind_01 price=44344c volume=96480 cumulative=114480 [clearHour] accept offer=o-21-coal party=gen_eskom_coal_01 price=84594c volume=1445520 cumulative=1560000 [clearHour] SMP=84594c marginal=gen_eskom_coal_01
Verify from your laptop (terminal):
curl -s /api/clearing/21/replay > receipt.json && npm run verify -- receipt.json
Or in your browser (no install): /clearing/21/verify
Commit this DAM clear to the append-only SHA-256 chain
(dam_cleared event). Best-effort: with no D1 binding bound
locally this degrades to a "not recorded" marker rather than failing.