Shadow-day · stage 3 of 4 · balancing & imbalance

Balancing · hour 04 · 2026-05-29

Stage status timestamp (balancing complete): 2026-05-29T05:50:00Z

Illustrative imbalance pricing (Trading Rules R2 §07 placeholder formula). Balancing consumes the final post-IDM schedule and prices each party's deviation from it against the metered outturn.

Reference SMP (IDM)

R832.05 / MWh

Indicative balancing price

R2000.00 / MWh

Net system imbalance

-14.5 MWh

system short (under-delivery)

Per-party imbalance settlement

Metered outturn vs final schedule. A modelled residual under-delivery of 14.5 MWh sits on Eskom Holdings — coal fleet (Generator) so the balancing market has a real action to price.

Party	Final sched (MWh)	Metered (MWh)	Imbalance (MWh)	Imb. price (R/MWh)	Amount
Eskom Holdings — coal fleet (Generator)	18685.3	18670.9	-14.5	R2000.00	R-28933.33

Implied under-delivery penalty: SMP × 1.15 or an R2 000/MWh floor, whichever is higher. The floor binds when the SMP is below R1 739,13/MWh. Illustrative, basis pending NERSA (Trading Rules R2 §07 placeholder).

Audit chain

Commit this balancing run to the append-only SHA-256 chain (balancing_complete event).

Full IDM + balancing transcript

[reclearIntraday] day=2026-05-29 hour=4 seed=42
[reclearIntraday] slip party=agg_renewables_01 -16.0% dam=180000 revised=151121 gap+=28879
[reclearIntraday] slip party=gen_ipp_wind_01 -0.1% dam=47820 revised=47758 gap+=62
[reclearIntraday] residual_gap=28941 backfilled=28941 uncovered=0 idm_smp=83205c backfill_awards=1
— BALANCING —
[computeBalancing] day=2026-05-29 hour=4
[computeBalancing] party=gen_eskom_coal_01 sched=1121121 metered=1120253 imb=-868 price=200000c amount=-2893333c
[computeBalancing] net_system_imbalance=-868 balancing_price=200000c