100,000 sq ft 24×7 hospital: ~529,000 kWh/yr in play

The model applies a BEE-style EPI to floor area and an operating-hours factor. A 24×7 hospital sits at a midpoint EPI of 340 kWh/m²/yr — four times a typical office — with roughly 50 percent HVAC and 15 percent lighting. The addressable band uses the same ASHRAE 90.1 / BEE midpoints (16 percent of HVAC, 35 percent of lighting, 3.5 percent of total), which for this heavier, less lighting-weighted mix resolve to about 16.75 percent.

The 100,000 sq ft input converts to ~9,290 m² (÷ 10.7639). Multiplying 340 × 9,290 gives a baseline near 3.16 million kWh/yr; 16.75 percent of that is close to 529,000 kWh/yr addressable, carrying roughly 376 tonnes of CO₂ a year. Note the contrast with the office preset: the far higher EPI and larger area produce a much larger absolute kWh headline, yet at a slightly lower percentage because lighting — the highest-yield category — is a smaller share of a hospital's load.

Raising floor area or the operating-hours factor increases the absolute kWh in play monotonically, since both enlarge the baseline. The percentage is fixed by the hospital use-mix and moves only if that mix changes — which is why a bigger hospital shows a bigger kWh headline at the same ~16.75 percent. Separate the two readings: the kWh is the area-and-hours story, the percentage is the use-mix story.

For a hospital, energy is only part of the case. This tool models addressable energy alone — it does not model clinical resilience, redundancy, emergency-power continuity, infection-control airflow or statutory compliance, all of which usually drive a hospital BMS more than energy does. It also excludes the installed plant, real occupancy and tariff detail, so treat the output as a screening figure that frames the energy conversation, not the whole business case.