IFRS S2 + NIS B-1 for Telecommunications in Mexico: 2026 Guide
BMV and BIVA issuers face the unique challenge of simultaneously complying with IFRS S2 (CNBV) and NIS B-1 (CINIF) for the same fiscal year, implying two regulatory frameworks, two regulators, and potentially two external assurance processes. Without a centralized platform, companies end up with sustainability and finance teams operating in silos, collecting redundant data in non-auditable spreadsheets. The overlap between IBSO indicators and IFRS S2 metrics is significant but not total, requiring precise mapping.
Telecommunications is a Scope 2-intensive sector (data centers, antennas) where renewable energy procurement (CEL or VPPA with IEnova/Zuma) is the primary decarbonization lever. IFRS S2 requires reporting the data center decarbonization plan — a topic that América Móvil and Axtel's CTO and Sustainability Directors are already evaluating under pressure from investors like BlackRock and Vanguard.
Why IFRS S2 + NIS B-1 Applies Differently in Telecommunications
Sustainability Director and CTO of telecom operators listed on BMV with data and voice networks required to report IFRS S1/S2 to CNBV
Thousands of remote antenna sites with diesel generators: Scope 1 from generator fleet in off-grid zones is the hardest to measure — fuel loading logs are manual and dispersed
Data center Scope 2: América Móvil and Axtel operate data centers PUE 1.6-2.0 with CFE off-peak energy contracts — market-based methodology requires renewable energy contracts (VPPA or CEL) not all yet have
IFRS S1 physical risk: critical infrastructure in hurricane zones (Caribbean, Gulf) with resilience analysis of towers and CEOS under winds >250 km/h under RCP 8.5 by 2050
Scope 3 category 11: use of sold or subsidized smartphones and devices generates emissions in use (daily charging) and end-of-life (WEEE) that the operator must estimate
Critical IFRS S2 + NIS B-1 KPIs for Telecommunications
| Required KPI | Data Source | Difficulty |
|---|---|---|
| Carbon intensity: tCO₂e per petabyte of data transmitted or per active subscriber | Purchased electricity (Scope 2) | High 🔴 |
| Weighted average PUE of own data centers (sector target: PUE <1.5) | Electricity bills (Scope 2) | High 🔴 |
| Percentage of antenna sites with renewable energy (solar + battery) vs. diesel | Cat 1 - Equipos de red (routers, antenas, servidores) fabricados en Asia | High 🔴 |
| Tonnes of WEEE collected in return programs and percentage with certified recycling | HR / payroll system | Medium 🟡 |
| Network energy intensity: kWh per GB of data traffic transmitted | ERP / accounting system | Medium 🟡 |
Hard-to-Collect Data in Telecommunications
Diesel consumption in backup generators (UPS + gensets) at remote antenna sites without telemetry: only available in physical logbooks from field contractors
PUE (Power Usage Effectiveness) of smaller data centers (<1 MW) operated in shared or leased facilities where the energy meter belongs to the landlord
Tonnes of WEEE (waste electrical and electronic equipment) generated from end-user equipment returns and final destination (certified recycling vs. informal disposal)
That is why manual Excel-based processes will not pass the 2027 assurance. Without automated traceability, an external auditor cannot verify the completeness or accuracy of emissions data.
Checklist: 8 Steps to Comply with IFRS S2 + NIS B-1 in Telecommunications
- 1
Mapping and reconciliation of all 30 IBSO indicators with IFRS S2 metrics requirements to avoid duplication of effort
- 2
Unified GHG emissions data collection for Scope 1, 2, and 3 serving both frameworks simultaneously without double measurement
- 3
Management of two distinct assurance processes: CNBV's limited assurance under IFRS S2 and CINIF's review under NIS B-1, ideally with the same auditor
- 4
Alignment of reporting calendars — the integrated sustainability report must meet both deadlines from a single data collection cycle
- 5
Implementation of robust internal controls over sustainability information capable of supporting third-party assurance under both frameworks from 2027
- 6
Connect data sources (ERP, meters, suppliers) to a centralized platform
- 7
Review with internal audit team and adjust consolidation perimeter
- 8
Generate report in CNBV/CINIF format ready for external assurance
How Climatta Automates IFRS S2 + NIS B-1 for Telecommunications
Automated Collection
Eliminate spreadsheets in Telecommunications. Climatta connects your systems and automatically collects Carbon intensity: tCO₂e per petabyte of data transmitted or per active subscriber and other critical KPIs.
Auditor-Grade Traceability
Every data point has source, date, and owner documented. The 2027 assurance auditor can trace every figure to its origin in your systems.
IFRS S2 + NIS B-1 Report Ready
Generates the report in the exact CNBV + CINIF format — tables, metrics, and narrative. No last-minute manual reformatting.
Onboarding in 4 Weeks
Climatta connects to Telecommunications systems in 4 weeks. No months-long IT project or external implementation consultant.
FAQ: IFRS S2 + NIS B-1 in Telecommunications
Ready to comply with IFRS S2 + NIS B-1 in Telecommunications?
Climatta centralizes all data collection, generates the report in regulatory format, and leaves it ready for 2027 external assurance. No spreadsheets.