Shadow-day · L4 · seller forecast-slip → IDM re-bid
Aggregator — renewables pool — IDM re-bid window
agg_renewables_01
When a variable plant's day-ahead forecast slips beyond −5% at the IDM gate, the seller can re-bid in the intraday market rather than fall straight into the (more expensive) balancing/imbalance settlement.
Hours forecast slipped
21 / 24
Total shortfall (do nothing)
761.3 MWh
Imbalance bill if no re-bid
R1586244.05
priced at the §07 under-delivery premium
Re-bid window · hour 13
IDM gate timestamp: 2026-05-29T14:25:00Z
Day-ahead award 300.0 MWh; forecast slipped -19.7% to 240.9 MWh available — a shortfall of 59.1 MWh. Do nothing and the imbalance bill is R118133.33. There is 316.6 MWh of residual demand to re-bid into at an IDM SMP of R841.83/MWh.
24-hour forecast-slip ledger
| Hr | DAM award | Slip | Revised | Shortfall | Imbalance (do nothing) | Re-bid? |
|---|---|---|---|---|---|---|
| 00 | 300.0 | -17.9% | 246.4 | 53.6 | R107166.67 | eligible |
| 01 | 300.0 | 1.1% | 303.4 | — | — | — |
| 02 | 300.0 | -3.3% | 290.0 | 10.0 | R20033.33 | — |
| 03 | 300.0 | -19.1% | 242.8 | 57.2 | R114466.67 | eligible |
| 04 | 300.0 | -16.0% | 251.9 | 48.1 | R96266.67 | eligible |
| 05 | 300.0 | 0.3% | 301.0 | — | — | — |
| 06 | 300.0 | -2.2% | 293.5 | 6.5 | R13033.33 | — |
| 07 | 300.0 | -9.8% | 270.6 | 29.4 | R58866.67 | eligible |
| 08 | 300.0 | -14.7% | 256.0 | 44.0 | R88033.33 | eligible |
| 09 | 300.0 | -15.6% | 253.1 | 46.9 | R93733.33 | eligible |
| 10 | 300.0 | -12.9% | 261.3 | 38.7 | R77433.33 | eligible |
| 11 | 300.0 | -16.0% | 251.9 | 48.1 | R96266.67 | eligible |
| 12 | 300.0 | -7.5% | 277.6 | 22.4 | R44766.67 | eligible |
| 13 | 300.0 | -19.7% | 240.9 | 59.1 | R118133.33 | eligible |
| 14 | 300.0 | -3.7% | 289.0 | 11.0 | R22033.33 | — |
| 15 | 300.0 | -18.0% | 246.1 | 53.9 | R107800.00 | eligible |
| 16 | 300.0 | -12.8% | 261.8 | 38.3 | R76500.00 | eligible |
| 17 | 300.0 | -14.2% | 257.6 | 42.5 | R106829.67 | eligible |
| 18 | 300.0 | -14.5% | 256.5 | 43.5 | R109679.41 | eligible |
| 19 | 300.0 | -7.1% | 278.7 | 21.3 | R54367.61 | eligible |
| 20 | 300.0 | -4.7% | 286.0 | 14.0 | R35367.36 | — |
| 21 | 300.0 | -13.4% | 259.7 | 40.3 | R80600.00 | eligible |
| 22 | 300.0 | -10.8% | 267.6 | 32.4 | R64866.67 | eligible |
| 23 | 300.0 | 3.4% | 310.2 | — | — | — |