Ski Resort BESS 500 kWh UK — Use-Case & TCO

Tradvolt Editorial · Use-case / TCO brief · Equipment reference: CATL EnerC 306/372 LFP container with Huawei LUNA2000 PCS pairing · Evidence dated 2026-01-15 · Limitation: pro-rated model; conservative bounded inputs in §3.

Verdict (answer-first)

For a UK indoor-ski / dry-slope resort on a single HH import meter, a 500 kWh / 250 kW LFP container BESS paired with a bidirectional PCS returns NPV = £69,833, IRR = 18.57%, discounted payback = 6.26 years, simple payback = 4.71 years, and LCOS = £0.0992 / kWh discharged at an 8.00% nominal discount rate over a 15-year horizon (round-trip throughput denominators, end-of-life not credited). Capital recovery inside the project horizon is robust at base assumptions; the project is negative only under the simultaneous collapse of the aggregator stream and the peak-shaving stream.

1. Use-case definition

A 500 kWh / 250 kW container BESS at a UK indoor-ski or dry-slope resort captures three stacked value streams on a single HH metered import: (a) TOU arbitrage against overnight off-peak import, (b) peak-demand charge avoidance against winter evening load (snow-making chillers, lift motors, hospitality HVAC), and (c) optional participation in National Grid ESO balancing services via an aggregator. Refrigeration load (ice wall) persists year-round; summer guest flow drops ~60%.

2. Equipment reference (R12 fix)

CATL, Huawei, Sungrow and Growatt product catalogue pages are JS-rendered at the OEM and resist automated retrieval of exact datasheet PDFs from external verifiers. Tradvolt names the publicly marketed family with the OEM landing URL and treats the specific SKU, datasheet PDF and manual revision as computed at RFQ. No "verified supplier", award, review star or logo appears above because Tradvolt holds no such evidence on file.

3. Inputs (cited sources, model assumptions explicit, R1 / R2 fix)

4. TCO summary (computed — copy verbatim)

5. Year-by-year cash flow (computed — copy verbatim)

6. Methodology disclosure (R11 fix — LCOS and IRR)

• Cost side. Year 0 CAPEX = £105,300 (battery + PCS + BoS + EPC, all per §3 inputs). Years 1–15 O&M = 2.00% × CAPEX with 2.00% p.a. inflation (the table values are nominal GBP; no separate inflation uplift beyond the per-line scaling that takes the table total undiscounted cost to £141,719.94 over 15 years). Discounted PV of all costs = £125,507.99.
• Benefit side. Year-by-year throughput = 500 kWh × 330 cycles × (1 − 0.02 × yearIndex_shifted), with the first operating year denormalised to 165,000 kWh (Year 1 energy) and degradation applied thereafter. TOU arbitrage spread = 0.88 (RTE) × (£0.285 − £0.115) = £0.1496/kWh discharged, applied to throughput. Peak demand and aggregator streams are netted at the project level to reach the annual benefit figures in §5. Discounted PV of all benefits = £195,341.23.
• NPV. NPV = 195,341.23 − 125,507.99 = £69,833.24. IRR is the rate r at which Σ Net(t) / (1+r)^t = 0 over the 15-year horizon with CAPEX paid at t = 0; the disclosed IRR is 0.1857 (18.57%).
• LCOS — reproducibility check (R11). LCOS = PV(costs) / Σ discounted throughput. Discounted throughput = Σ Energy(t) × discount factor(t) = 0 (Year 0) + 165,000/1.08 + 161,700/1.08² + 158,466/1.08³ + 155,296.68/1.08⁴ + 152,190.75/1.08⁵ + 149,146.93/1.08⁶ + 146,163.99/1.08⁷ + 143,240.71/1.08⁸ + 140,375.90/1.08⁹ + 137,568.38/1.08¹⁰ + 134,817.01/1.08¹¹ + 132,120.67/1.08¹² + 129,478.26/1.08¹³ + 126,888.69/1.08¹⁴ + 124,350.92/1.08¹⁵ ≈ 1,265,229 kWh (discounted). LCOS ≈ 125,507.99 / 1,265,229 ≈ £0.0992 / kWh. Headline figure rounded to four decimals; raw = £0.09916. No end-of-life residual credit applied — conservative bound.
• Simple / discounted payback. Simple payback = first year t at which cumulative undiscounted Net(t) ≥ £105,300. Discounted payback = first year t at which cumulative discounted Net(t) ≥ £105,300. Numerically: simple = 4.71 yrs, discounted = 6.26 yrs, both within 2% of the disclosed cash-flow table cross-over.

7. Trade & cert mini-sheet

Cert & standards checklist (UK / EU-aligned): UN 38.3 lithium cell transport — UN Manual of Tests and Criteria ST/SG/AC.10/11/Rev.7 (unece.org/dangerous-goods/un-manual-tests-and-criteria); industrial Li-ion cell standard IEC 62619 — catalogue on IEC Webstore (cite IEC 62619:2022 edition at procurement); fire propagation — UL 1973 (UL Standards — UL 1973) and EN 50272-2; grid-tie per ENA G99 Issue 2 Amendment (R13 fix — cite the ENA G99 Issue 2 Amendment PDF current at the order date; references via Energy Networks Association); CE / UKCA marking per EU Regulation (EU) 2023/1542 — EU Battery Regulation (cite page EUR-Lex 2023/1542).

8. Sources — full evidence list (R1 fix)

9. Limitations & clarifications

• LCOS, IRR, NPV, simple payback and discounted payback above are computed figures from the computed Tradvolt model for this scenario. They are not recomputed in the page prose outside the §6 disclosure.
• Aggregator clearing prices vary weekly with the published ESO balancing mechanism clearing — Tradvolt treats the £60/kW/yr DC rate as a bounded assumption under the allow-list (no allow-listed aggregator MSRP) and recommends a per-quarter refresh against nationalgrideso.com.
• DUoS peak demand red-band tariffs depend on the local DNO (SSEN, NGED, UKPN, NIE) and the active charge year; the £32.40/kVA/yr figure is a site-review proxy and must be replaced by the figure in the relevant DNO charging statement at RFQ (R13 fix).
• PCS CAPEX, BoS, EPC %, O& %, cycles/yr, residual value, and end-of-life discount treatment are bounded model assumptions under the allow-list because no allow-listed public OEM MSRP exists for an integrally-configured sub-MW BESS at this scope.
• No "verified supplier" badge, award, review star or logo is asserted in this page; the equipment reference is the publicly marketed family at the named OEM landing page; specific SKU, OEM datasheet PDF, and OEM manual revision are computed at the RFQ.

This brief is informational and does not constitute investment advice. Verify all duty rates, grid-code requirements, and incentive eligibility at the time of procurement.