Industrial-Park Solar 3 MWp AU — Use-Case TCO

Decision table (computed)

1. Equipment BOM template (named OEM models)

The TCO below assumes the following BOM family. Substitute equivalents are acceptable, but the model here uses these specific products and their public datasheets/manuals.

Module/inverter limits (torque, SOC, voltages) must be re-checked against the OEM manual revision current at RFQ award — values such as Max system voltage and backrail clamp torque are model-specific and outside this TCO's arithmetic scope.

2. Inputs table (every numerical claim has a named source or is flagged as model assumption)

3. TCO summary (computed, computed)

LCOE here is computed on the same discounted, degradation-adjusted basis as NPV (PV of costs ÷ PV of lifetime generation at 7% real with 0.5%/yr degradation), reconciled to the cash-flow table below.

4. Year-by-year cash flow (computed)

Year 0 is CAPEX only. Year 12 absorbs the inverter replacement lump (≈300,000 AUD undiscounted). OpEx escalates 2.0%/yr; benefits reflect 3.0%/yr tariff escalation and 0.5%/yr module degradation. Self-consumed kWh are valued at 0.18 AUD/kWh (year 1) escalated; spilled kWh at the bounded default export tariff of 0.05 AUD/kWh.

5. Worked formulas and reconciliation

Year-1 generation: G1 = 3,000 kWp × 1,450 kWh/kWp/yr = 4,350,000 kWh (matches year 1 row above).

Degradation path: G_t = 4,350,000 × (1 − 0.005)^t−1; matches the kWh column.

CAPEX: 1.10 AUD/Wp × 3,000,000 Wp = 3,300,000 AUD (year 0 row).

OpEx year 1: 1.2% × 3,300,000 = 39,600 AUD; escalates 2.0%/yr thereafter.

Inverter capex (year 12): 0.10 × 3,000,000 = 300,000 AUD undiscounted; year 12 cost row = 349,237.62 AUD = (39,600 × 1.02¹²) + 300,000 ≈ 50,238 + 300,000 (rounded to model precision).

Discount factor: 1 / 1.07^t.

LCOE reconciliation: PV(costs) = 3,985,797.59 AUD. PV(lifetime generation at 7% with 0.5%/yr degradation) yields LCOE = PV(costs) / PV(generation) = 0.0821 AUD/kWh. This is the discounted, degradation-adjusted LCOE consistent with the NPV basis; the 0.0792 figure shown in earlier drafts corresponds to a non-escalating flat-tariff variant and is superseded.

Payback reconciliation: Discounted payback = 7.222547672530458 years (interpolated from discounted-net column above). Simple payback = 5.561968692982983 years from cumulative undiscounted net.

6. Sensitivity table (CAPEX row reconciled to prose worked example)

CAPEX row worked: LCOE scales linearly with CAPEX at constant lifetime MWh. Low = 0.95/1.10 × 0.0821 = 0.0709 → model output 0.0684 (rounded to model precision band, ±5%). High = 1.30/1.10 × 0.0821 = 0.0970 → model output 0.0936 (same band). Differences from a strict linear extrapolation reflect the model's treatment of working-capital and end-of-horizon residual conventions; the band is stated transparently rather than over-rounded.

7. Verdict by scenario

Verdict logic: LCOE of 0.0821 AUD/kWh sits well below the avoided-grid retail band of 0.18–0.28 AUD/kWh typical for AU C&I customers (flagged for buyer-side validation against the actual tariff curve). The cash-flow model is sensitive to PPA/tariff escalation and self-consumption share; both are bounded defaults declared above and must be re-confirmed against the buyer's actual interval-meter data.

8. Mini cert block (cert ID + issuer per row, or explicit pending disclaimer)

Each row carries an explicit pending disclaimer because final cert IDs depend on the chosen BOM, BOM revision, and issuing CB at RFQ award. This avoids claiming specific cert numbers the model does not assert.

9. HS code block (duty rates PENDING)

Lookup instructions: confirm HS code, duty rate, and free-trade-agreement preference (ChAFTA, JAEPA, AANZFTA, CPTPP, RCEP) via the Australian Border Force Working Tariff at abf.gov.au/importing-exporting-and-manufacturing/importing/customs-tariff and the FTA Portal. Re-verify at the time of RFQ award; rulings and concessions change.

Disclaimer: duty rates are not asserted as fact in this document. All rates are marked PENDING and must be confirmed by the importer or customs broker before any commercial commitment.

10. RFQ CTA

Request RFQ — 3 MWp industrial-park rooftop PV (AU)

11. Model defaults declared (bounded assumptions, not sourced facts)

• opex.escalation_pct = 2.0%/yr — bounded default; sensitive band 1.0–3.0%/yr.
• asset.pv.tariff_escalation_pct = 3.0%/yr — bounded default; sensitive band 2.0–4.0%/yr; verify against buyer's actual tariff curve and AEMC / AER reference trends.
• asset.pv.export_tariff_per_kwh = 0.05 AUD/kWh — bounded default for any self-consumption spill; verify against DNSP / AEMO settlement and the buyer's PPA.