Buyer settlement

Large customer — EIUG mine

lc_mine_eiug_01

Period: 2026-05-29 (single demo day, 24 hours). Net cost shown is for THIS day only — the iterate-1 ×30 monthly projection has been removed; full month aggregation requires 28–31 distinct fixture days.

Sign convention — energy, NBC, imbalance: negative (charge). CfD: signed (positive = collected from seller, negative = paid to seller).

demand side · Phase 1 Buyer bids are price-taking (illustrative) in Phase 1: the day-ahead clear runs against an exogenous system-load forecast, so a buyer's awarded volume is its scheduled take, not the output of a buyer bid-stack vs supply-stack intersection. The volume the cap is measured against is genuine; the price is set by the supply stack and the load forecast, not by this party's bid. Bid-driven demand clearing is on the roadmap.

illustrative synthetic outturn The Metered and Dev columns are an illustrative synthetic outturn (a flat 2% under-take before 06:00), modelled here independently of the IDM / balancing forecast-slip residual shown on the shadow-day stages. The two imbalance models are not yet reconciled, so this deviation and the do-nothing IDM bill are not guaranteed to be the same number. Single-source-of-truth fix is on the roadmap.

CfD-vs-SMP for active bilateral PPAs · non-bypassable charges shown as separate prominent lines (Trading Rules R2 §06.2 / §06.3 / §06.4) · imbalance priced via the §07 placeholder formula (illustrative until R2 confirms). Turn the illustrative just-transition line on.

Show sample-month roll-up (×30) →

Third-party volume ramp · Trading Rules R2 §08 APPROACHING CAP

91% of the year-2 cap used cap = 30% of baseline

Declared baseline 35 000 MWh/day · third-party (contestable) take 9 600 MWh/day (27% of baseline) · year-2 cap 10 500 MWh/day. Bids beyond this cap are rejected server-side at /api/offers (year_n_volume_cap_exceeded). illustrative baseline

Ramp year: Y0 Y1 Y2 Y3 Y4 (20 → 20 → 30 → 40 → 50% glide path)

Hr	SMP	Sched MWh	Metered illustrative synthetic outturn	Dev illustrative	Energy	CfD	NBC	Imbalance	Net cost
00	R847.93	400.0	392.0	-8.00	−R339 172,00	−R1 562,10	−R62 000,00	−R16 000,00	−R418 734,10
01	R839.99	400.0	392.0	-8.00	−R335 996,00	−R1 800,30	−R62 000,00	−R16 000,00	−R415 796,30
02	R848.83	400.0	392.0	-8.00	−R339 532,00	−R1 535,10	−R62 000,00	−R16 000,00	−R419 067,10
03	R851.21	400.0	392.0	-8.00	−R340 484,00	−R1 463,70	−R62 000,00	−R16 000,00	−R419 947,70
04	R832.05	400.0	392.0	-8.00	−R332 820,00	−R2 038,50	−R62 000,00	−R16 000,00	−R412 858,50
05	R850.31	400.0	392.0	-8.00	−R340 124,00	−R1 490,70	−R62 000,00	−R16 000,00	−R419 614,70
06	R833.51	400.0	400.0	0.00	−R333 404,00	−R1 994,70	−R62 000,00	R0,00	−R397 398,70
07	R854.47	400.0	400.0	0.00	−R341 788,00	−R1 365,90	−R62 000,00	R0,00	−R405 153,90
08	R862.87	400.0	400.0	0.00	−R345 148,00	−R1 113,90	−R62 000,00	R0,00	−R408 261,90
09	R842.91	400.0	400.0	0.00	−R337 164,00	−R1 712,70	−R62 000,00	R0,00	−R400 876,70
10	R851.80	400.0	400.0	0.00	−R340 720,00	−R1 446,00	−R62 000,00	R0,00	−R404 166,00
11	R862.87	400.0	400.0	0.00	−R345 148,00	−R1 113,90	−R62 000,00	R0,00	−R408 261,90
12	R856.18	400.0	400.0	0.00	−R342 472,00	−R1 314,60	−R62 000,00	R0,00	−R405 786,60
13	R864.54	400.0	400.0	0.00	−R345 816,00	−R1 063,80	−R62 000,00	R0,00	−R408 879,80
14	R849.56	400.0	400.0	0.00	−R339 824,00	−R1 513,20	−R62 000,00	R0,00	−R403 337,20
15	R838.83	400.0	400.0	0.00	−R335 532,00	−R1 835,10	−R62 000,00	R0,00	−R399 367,10
16	R847.37	400.0	400.0	0.00	−R338 948,00	−R1 578,90	−R62 000,00	R0,00	−R402 526,90
17	R1091.95	400.0	400.0	0.00	−R436 780,00	R5 758,50	−R62 000,00	R0,00	−R493 021,50
18	R1081.69	400.0	400.0	0.00	−R432 676,00	R5 450,70	−R62 000,00	R0,00	−R489 225,30
19	R1086.16	400.0	400.0	0.00	−R434 464,00	R5 584,80	−R62 000,00	R0,00	−R490 879,20
20	R1088.33	400.0	400.0	0.00	−R435 332,00	R5 649,90	−R62 000,00	R0,00	−R491 682,10
21	R864.37	400.0	400.0	0.00	−R345 748,00	−R1 068,90	−R62 000,00	R0,00	−R408 816,90
22	R869.65	400.0	400.0	0.00	−R347 860,00	−R910,50	−R62 000,00	R0,00	−R410 770,50
23	R857.23	400.0	400.0	0.00	−R342 892,00	−R1 283,10	−R62 000,00	R0,00	−R406 175,10
Net cost · 24-hour demo day									−R10 140 605,70

Forecast-slip downside Indicative under-take exposure for this party at ±1%, 2%, 5% deviation is computed from the §07 placeholder formula (max(SMP × 1.15, R2 000/MWh)). Final imbalance formation will be market-based when SAWEM liquidity supports it.

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).