Model a single pilot site

Cumulative cash flow (5 years)

Equations behind the charts

Napkin numbers only — rough working assumptions for a Phase 0 model, not audited figures or a quote.

Upfront capex

Capex = (GPUs × €/GPU) + infra + (property × down payment %)

Compute revenue / month

Compute = GPUs × 730 h × utilisation × €/GPU-hour

Rent revenue / month

Rent = monthly rent × occupancy

Electricity cost / month

Power = IT_kW × PUE × 730 × [(1 − solar%) × €_grid + solar% × €_solar]

Heat bill offset / month (heating months only)

Heat = IT_kW × 730 × capture% × €/kWh_heat (else 0)

Net cash / month

Net = Compute + Rent − Power + Heat − fixed opex − mortgage

Cumulative cash (chart)

Cumulative_m = −Capex + Σ Net_t for t = 1…m

5-year NPV @ 12%

NPV = −Capex + Σ [ Net_m / (1 + r_month)^m ]

What the terms mean

• IT_kW — average power drawn by the GPUs themselves (after utilisation and idle floor). Not the whole house.
• PUE — Power Usage Effectiveness. Multiplier for cooling, pumps, fans and house overhead. Facility kW = IT_kW × PUE (e.g. 1.35 ≈ 35% overhead).
• Facility load — what the grid/solar must supply: IT_kW × PUE. Used for the electricity cost line.
• Heat offset — money saved on heating when waste heat is captured in heating season. Not a third revenue line.
• Utilisation — fraction of GPU-hours sold. Drives both compute revenue and (partly) power draw.
• Upfront capex — cash out at day 0: GPUs + infra + property down payment (not the full mortgage).
• NPV — present value of monthly net cash over 5 years, discounted at 12%/yr, minus upfront capex.