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

Balancing · hour 18 · 2026-05-29

Stage status timestamp (balancing complete): 2026-05-29T19:50:00Z

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)

R1081.69 / MWh

Indicative balancing price

R2000.00 / MWh

Net system imbalance

-18.0 MWh

system short (under-delivery)

Per-party imbalance settlement

Metered outturn vs final schedule. A modelled residual under-delivery of 18.0 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)	2231.7	2213.7	-18.0	R2000.00	R-36033.33

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=18 seed=42
[reclearIntraday] slip party=agg_renewables_01 -14.5% dam=180000 revised=153887 gap+=26113
[reclearIntraday] slip party=gen_ipp_wind_01 -17.2% dam=57720 revised=47791 gap+=9929
[reclearIntraday] residual_gap=36042 backfilled=36042 uncovered=0 idm_smp=108169c backfill_awards=1
— BALANCING —
[computeBalancing] day=2026-05-29 hour=18
[computeBalancing] party=gen_bess_ipp_01 sched=133902 metered=132821 imb=-1081 price=200000c amount=-3603333c
[computeBalancing] net_system_imbalance=-1081 balancing_price=200000c