Carbon verification and assurance
Independent review of organizational inventories, project reductions, product carbon footprints and sustainability information.
ISO 14064ISO 14067ISAE 3000CPA
Service Capabilities
Independent assurance and audit capabilities by industry
Enerstay structures GHG verification and validation, second- and third-party ISO audits, industrial MRV evidence review and practice-led training around the evidence systems of each sector.
- 3
- delivery families
- 7
- industry pathways
- ISO / MRV
- criteria-led evidence
Delivery System
Three ways we support an assignment
The engagement type, applicable criteria, evidence owner and decision role are confirmed before work begins.
Management-system and supplier audits
Second- and third-party audits, supplier assessments and findings follow-up for environmental, energy and safety systems.
ISO 14001ISO 45001ISO 50001Supplier Audit
Industrial MRV and evidence controls
Review of activity data, emission factors, equipment and test records, supplier information, QA/QC and traceable evidence packs.
Activity DataQA/QCEvidence PackReview Trail
Evidence Workflow
From source evidence to an independent conclusion
Testing and measurement records may originate from the client or a named technical provider. Enerstay evaluates only the evidence and criteria within the confirmed assignment scope.
- 01Define scope and criteria
- 02Review measurement evidence
- 03Evaluate calculations and control evidence
- 04Address findings and complete traceability
- 05Issue the scoped conclusion
Industry Pathways
Sector-specific evidence systems
Each pathway highlights the measurements, records and operating context most likely to shape the assignment.
The references below are selected at contract review according to the assignment scope; they do not represent a universal certification scope.
01
Advanced manufacturing
Semiconductors
Complex-gas inventories, abatement evidence and resource-intensive manufacturing controls.
- Fab GHG and Singapore CPA MRV
- High-GWP gas abatement performance
- Cleanroom energy and resource efficiency
- Product carbon footprint and supplier data
ISO 14064-1/-2/-3ISO 14067ISO 14040/14044ISO 50001/50002-1ISO 14644-1/-2/-3/-8/-14SEMI S23CPA/REG(E)
02
Process industry
Oil, gas and petrochemicals
Facility inventories and loss-control evidence across process, fuel and fugitive-emission systems.
- Refinery and petrochemical GHG inventories
- Methane MRV and LDAR evidence
- LNG and fuel carbon intensity
- Asset integrity and carbon-loss records
ISO 14064-1/-2/-3ISO 14067/14040/14044OGMP 2.0EN 15446ASTM D1945/D5504Singapore CPA
03
Mobility
Personal vehicles and emissions
Tailpipe, use-phase and lifecycle evidence across ICE, hybrid and electric vehicle pathways.
- Tailpipe emissions and fuel economy
- ICE, hybrid and EV lifecycle carbon
- Battery, charging and tyre sustainability
- Vehicle-kilometre and use-phase metrics
ISO 14083ISO 14064-1ISO 14067/14040/14044UN R154/WLTP/GTR 15IEC 61851/62196IEC 62660/ISO 12405/UN R100ISO 28580/UN R117
04
Mass transport
Rail and public transport
Operator, fleet, depot and infrastructure evidence for passenger transport carbon performance.
- Transport GHG and ISO 14083 metrics
- Traction energy and depot efficiency
- Rolling-stock and infrastructure carbon
- Resilience, air quality and circularity
ISO 14083ISO 14064-1ISO 50001/50002-1ISO 14040/14044ISO 14067Scope 1/2/3
05
Products
Electronics and electrical products
Material, energy-use and reliability evidence for product-level environmental claims.
- Substance and material-compliance evidence
- Energy efficiency and use-phase carbon
- Reliability-adjusted carbon assessment
- PCF, EPD and eco-design evidence
IEC 62321IEC 62474IEC 62430ISO 14067/14040/14044ISO 14025IEC 60068MEPS/MELS
06
Consumer supply chains
Food and beverage
Product, water, packaging and cold-chain evidence across resource-intensive supply chains.
- Food product carbon footprints
- Water footprint and effluent records
- Sustainable-packaging evidence
- Cold-chain and food-waste carbon
ISO 14067/14040/14044ISO 14046ISO 14064-1/-2/-3ISO 14083ISO 14021ISO 4833/6579/11290ISO 16649/21527
07
Built environment
Buildings and infrastructure
Material, thermal, operational and circularity evidence across building and infrastructure life cycles.
- Low-carbon construction materials
- EPD and product life-cycle assessment
- Thermal performance and operational carbon
- Building MRV, resilience and circularity
ISO 14025/21930EN 15804ISO 14067/14040/14044ASTM C39/C518ISO 8301ASTM C1549/E903/C1371/E1980ISO 50001/50002-1ISO 16000SS 553/554PAS 2080BCA Green Mark
Role Clarity
The service route is confirmed before delivery
Training and research are governed separately from formal verification, validation and audit conclusions. Any laboratory, certification-body or programme partner is named only when it has a defined role in the assignment.