How to do an energy audit — complete step-by-step process

Energy audit · 10 min read · Updated 2026-04-06
TL;DR

A proper energy audit has 7 phases: scoping, measurement (24–72h logging), load disaggregation, benchmarking, opportunity identification, ROI modelling, and reporting. Enlog uses IoT meters to automate phases 2–4, cutting audit time from weeks to days.

The 7 phases of a professional energy audit

  • —Phase 1 — Scoping: define boundaries, tariffs, loads and stakeholder KPIs.
  • —Phase 2 — Measurement: install portable loggers or IoT meters for 24–72 hours minimum at every major feeder.
  • —Phase 3 — Disaggregation: break total consumption into HVAC, lighting, plug, process, DG and common-area buckets.
  • —Phase 4 — Benchmarking: compare kWh/sqft, kWh/room-night or kWh/unit-produced against industry norms.
  • —Phase 5 — Opportunity ID: harmonics, PF, phantom load, oversized AHU, DG inefficiency, lighting schedules.
  • —Phase 6 — ROI modelling: every recommendation gets a payback in months, not years.
  • —Phase 7 — Report + action plan: executive summary, detailed findings, investment ranking.

Type 1, 2 and 3 energy audits (BEE classification)

BEE (Bureau of Energy Efficiency) classifies audits into walk-through (Type 1), preliminary (Type 2) and detailed investment-grade (Type 3). For PG/hostel, a Type 1 is usually enough; for hotels, malls, factories and data centers, Type 3 is recommended every 2–3 years.

How IoT changes energy audits

Traditional audits rely on short-term data loggers and a lot of spreadsheet work. IoT-grade audits (using meters like Enlog Enmate / EnPro) capture real-time data for weeks or months, so load patterns at different occupancy, seasons and shift schedules are visible. Recommendations become measurable — 'we will save X kWh with Y intervention' — instead of guesses.

Frequently asked questions

Is an energy audit mandatory in India?

Yes, for designated consumers under the Energy Conservation Act 2001 (BEE). This includes large industries and commercial buildings above certain connected-load thresholds. Even where not mandatory, audits deliver strong ROI.

How long does an energy audit take?

A BEE Type 1 walk-through takes 1–2 days. A Type 3 detailed audit for a hotel or factory typically runs 3–6 weeks including data collection and report. Enlog's IoT-assisted approach cuts this to 1–2 weeks.

What does an energy audit cost?

Varies by scope: ₹25,000–₹75,000 for small commercial, ₹1.5–5 lakh for mid-size hotels/malls, ₹5–15 lakh for large factories. IoT-assisted audits amortise cost because the meters keep delivering value after the audit.

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