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ISO 50015: Measuring and Verifying
Energy Savings

ISO 50015 provides the principles by which energy performance improvements are objectively measured and verified — indispensable for demonstrating savings to management, auditors, and funding bodies.

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→ Fundamentals

What is ISO 50015?

ISO 50015 defines general principles and guidelines for the measurement and verification (M&V) of energy performance improvements in organisations. It complements ISO 50001 and ISO 50006 with the methodological rigour required to produce robust, verifiable evidence.

The central question is: How much energy was actually saved? This sounds straightforward, but it is not — because consumption depends on many factors (production, weather, operating hours) that may have changed between the baseline period and the reporting period.

ISO 50015 specifies how these factors must be accounted for so that the M&V report withstands scrutiny from third parties — auditors, banks, and funding bodies.

M&V Key Terms

Baseline Period
The reference period before implementation of the measure. It forms the comparison point for all subsequent savings verification.
Reporting Period
The period after implementation of the measure, during which energy performance is measured and compared against the baseline.
Adjustment
Modification of the baseline or reporting period to account for changed boundary conditions (production, climate, building occupancy).
→ Core Principles

The 5 M&V Principles of ISO 50015

1
Conservatism
Where assumptions are uncertain, they are made on the cautious side. Savings are more likely to be understated than overstated.
2
Completeness
All relevant energy sources and influencing factors are taken into account. There is no selective use of favourable data points.
3
Consistency
The baseline and reporting period are measured and evaluated using the same methods. Any changes in methodology are documented and justified.
4
Accuracy
Measurement accuracy and statistical uncertainty are reported transparently. The M&V plan specifies accuracy requirements in advance.
5
Transparency
All assumptions, data, and calculations are fully documented and traceable by third parties — the foundation for external verification.
→ Software Support

M&V Automated with Alligator

Manual M&V is time-consuming and error-prone. The Alligator platform handles the majority of calculations automatically — in conformance with ISO 50015 and ISO 50006.

Automatic Baseline Tracking

Baseline periods are configured once. The system continuously calculates the deviation from current consumption — normalised and adjusted.

Normalisation & Adjustment

Weather, production, operating hours — all relevant factors are automatically incorporated into the savings calculation.

M&V Reports at the Click of a Button

Complete documentation of all assumptions, calculation paths, and results — as PDF or Excel, audit-ready and standard-compliant.

Transparent Data Foundation

All raw data, measurement points, and intermediate calculations are stored in a tamper-proof audit trail and accessible at any time — ready for external verification.

Make Your Energy Savings Verifiable

We'll show you how ISO 50015 works in practice — with a live demo of the Alligator platform.

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