Shadow-day · stage 2 of 4 · intraday market
IDM re-clear · hour 07 · 2026-05-29
Stage status timestamp (IDM re-cleared): 2026-05-29T08:25:00Z
Illustrative re-clearing — production MMS runs a full intraday SCED. The IDM stage consumes the DAM result for this hour, applies each variable generator's revised forecast, and re-clears the residual gap.
DAM SMP
R832.98 / MWh
IDM SMP
R832.98 / MWh
Residual gap re-cleared
50.7 MWh
from forecast slip on variable plant
Forecast adjustments at the IDM gate
Variable generators (wind / solar / aggregated renewables) revise availability; a slip beyond −5% makes the seller IDM re-bid eligible (the forecast-slip story). Dispatchable plant shows 0% slip.
| Party | DAM award (MWh) | Forecast slip | Revised (MWh) | Gap (MWh) | Re-bid? |
|---|---|---|---|---|---|
| Aggregator — renewables pool | 300.0 | -9.8% | 270.6 | -29.4 | re-bid window → |
| Eskom Holdings — coal fleet (Generator) | 26177.0 | — | 26177.0 | — | — |
| IPP — solar BW5 (Generator) | 407.0 | 3.4% | 420.9 | — | — |
| IPP — wind plant (Generator) | 1116.0 | -1.9% | 1094.7 | -21.3 | — |
IDM backfill awards
Supply re-dispatched to cover the residual gap, paid at the IDM SMP.
| Party | MWh | Price (R/MWh) |
|---|---|---|
| Eskom Holdings — coal fleet (Generator) | 50.7 | R832.98 |
Commit this IDM re-clear to the append-only SHA-256 chain
(idm_re_cleared event). Best-effort: with no D1 binding bound
locally this degrades to a "not recorded" marker rather than failing.
Full DAM + IDM transcript
[clearHour] day=2026-05-29 hour=7 seed=42 [clearHour] tieBreak=price_asc → ts_asc → party_id_asc [clearHour] demand_mw_min=1680000 [clearHour] accept offer=o-07-solar party=gen_ipp_solar_bw5_01 price=38723c volume=24420 cumulative=24420 [clearHour] accept offer=o-07-renew-agg party=agg_renewables_01 price=40772c volume=18000 cumulative=42420 [clearHour] accept offer=o-07-wind party=gen_ipp_wind_01 price=45639c volume=66960 cumulative=109380 [clearHour] accept offer=o-07-coal party=gen_eskom_coal_01 price=83298c volume=1570620 cumulative=1680000 [clearHour] SMP=83298c marginal=gen_eskom_coal_01 — IDM — [reclearIntraday] day=2026-05-29 hour=7 seed=42 [reclearIntraday] slip party=agg_renewables_01 -9.8% dam=18000 revised=16234 gap+=1766 [reclearIntraday] slip party=gen_ipp_wind_01 -1.9% dam=66960 revised=65684 gap+=1276 [reclearIntraday] residual_gap=3042 backfilled=3042 uncovered=0 idm_smp=83298c backfill_awards=1