Hotel Energy Audit Pathway 2026 — Pre-Solar Checklist

Before any UK hotel commits to solar capex in 2026, three energy data analysis steps materially improve the eventual project economics. Skip them and you risk over- or under-sizing the system; do them well and the resulting solar economics are 10-20% better than the standard postcode-based estimate.

Step 1 — 12 months of half-hourly meter data

UK commercial electricity meters log half-hourly demand data, retained by your supplier for 12+ months. Request a CSV download from your supplier (Octopus Business, EDF, Drax, British Gas Business, E.ON all provide this) and we model your specific demand profile. The half-hourly data reveals:

• True peak demand vs average demand (typically 2.5-4x ratio for hotels)
• Time-of-day demand pattern (when does load happen?)
• Day-of-week pattern (weekday vs weekend variation)
• Seasonal pattern (summer vs winter, festival/event periods)
• Underlying baseload (always-on load: refrigeration, lifts, fire systems, lighting baseline)

This data drives accurate solar sizing — typically within 3-5% of actual performance versus 15-25% variance on postcode-only estimates.

Step 2 — Demand profile shaping opportunities

Before sizing solar, identify load-shift opportunities. Common hotel load-shifts:

• Pool plant timing — can pool heating be shifted to peak solar hours via smart controls?
• Laundry scheduling — can in-house laundry shift from evening to daytime hours?
• EV charging smart-control — can guest charging prioritise solar generation?
• Cold-store thermostat shifting — can walk-in chillers pre-cool during peak solar?

Each load-shift opportunity increases solar self-consumption — typically 3-8% additional self-consumption per opportunity captured.

Step 3 — Solar sizing iteration

With demand profile data and load-shift opportunities identified, solar sizing iterates between three constraints: roof area available, demand match, and capex budget. The optimal system typically falls in the 80-95% self-consumption sweet spot — beyond that, marginal panels start exporting at low SEG tariff rather than self-consuming at high grid tariff.

See more

See hotel solar suitability check for an interactive personalised assessment.