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

Balancing · hour 19 · 2026-05-29

Stage status timestamp (balancing complete): 2026-05-29T20:50:00Z

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)

R1086.16 / MWh

Indicative balancing price

R2000.00 / MWh

Net system imbalance

-11.2 MWh

system short (under-delivery)

Per-party imbalance settlement

Metered outturn vs final schedule. A modelled residual under-delivery of 11.2 MWh sits on IPP — battery storage (BESS) (Generator) so the balancing market has a real action to price.

Party	Final sched (MWh)	Metered (MWh)	Imbalance (MWh)	Imb. price (R/MWh)	Amount
IPP — battery storage (BESS) (Generator)	2146.6	2135.4	-11.2	R2000.00	R-22300.00

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=19 seed=42
[reclearIntraday] slip party=agg_renewables_01 -7.1% dam=180000 revised=167221 gap+=12779
[reclearIntraday] slip party=gen_ipp_wind_01 -12.9% dam=73500 revised=63983 gap+=9517
[reclearIntraday] residual_gap=22296 backfilled=22296 uncovered=0 idm_smp=108616c backfill_awards=1
— BALANCING —
[computeBalancing] day=2026-05-29 hour=19
[computeBalancing] party=gen_bess_ipp_01 sched=128796 metered=128127 imb=-669 price=200000c amount=-2230000c
[computeBalancing] net_system_imbalance=-669 balancing_price=200000c