Reporting period: 1 January 2025 – 31 December 2025
An honest look at Kaluza's sustainability performance for the calendar year 2025 - what we measured, where we improved, and where we fell short.
Sep 15, 2026
Kaluza impact report 2025
4,214
tCO₂e total footprint
(-27% vs 2024)
(-27% vs 2024)
878
Total workforce (645 employees + 233 contractors)
7.0%
Gender pay gap (median)(down from 12.5%)
91.8%
Security awareness training completion
Environment
1,505
Cloud emissions (tCO₂e)
35.7% of total. AWS accounts for 90%. Azure confirmed as zero.
1,336
Purchased services (tCO₂e)
31.7% of total. Professional services, SaaS tools, facilities.
821
Business travel (tCO₂e)
19.5% of total. Rail, flights, hotels. +60% vs 2024.
460
Commuting & WFH (tCO₂e)
10.9% of total. Proxy estimate from 2023–24 surveys.
284,446 kWh total energy. Scope 1+2: 48.78 tCO₂e (location) / 36.37 (market). Intensity: 1.23 tCO₂e/£m revenue.
South Block (London) and Rivergate (Bristol) supplied with 100% renewable electricity by Good Energy, covering ~76% of UK electricity consumption.
The 27% reduction from 2024's 5,788 tCO₂e is primarily driven by methodology improvements - AWS's shift to actual measurement, current-vintage emission factors, and better invoice deduplication - rather than equivalent reductions in spend. Travel (+60%) and commuting (+30%) both increased with growth.
Targets validated 2021. 4,214 tCO₂e represents growth from baseline, driven by platform expansion. Mandatory recalculation by January 2028. SWEEP platform, GreenDev programme, and Supplier Code of Conduct provide infrastructure for managing the trajectory.
People
35.4%
Women in leadership
Up from 28% in 2023. Target was 40%.
16.7%
Female attrition
Down from 25% in 2023. Beat our <20% target.
23.6%
Women in engineering
Up from 17% in 2023. Target was 25%.
14.6%
Ethnic minority
Marginal improvement from 14%. Target was 20%.
Median: 7.0% (down from 12.5%). Mean: 5.4% (down from 11.5%). Women: 35.7% of workforce, 34.3% in upper pay quarter, 46.2% in lowest quarter. Bonus gap: 17.7% median.
Engagement score: 6.39/10 (target 8.4). eNPS: -31 (target >10). Diversity perception: 7.74/10 (improved from 7.5 baseline). Drivers of decline: reward, workload, communication.
Active neurodiversity community. In 2025: ADHD sub-groups established in UK and Australia. "Body doubling" sessions introduced during performance reviews to support neurodiverse employees with self-assessments.
1 recordable case of work-related ill health. Anti-Modern Slavery Policy in place (Nov 2023). Covered by OVO Group Section 54 statement. Supplier Code of Conduct prohibits forced/bonded/child labour.
Ethics & Governance
ISO 27001
Certificate IS 762601.
Valid to October 2028. Annual risk assessment + continuous updates.
0
Whistleblower reports
Zero reports received. Zero corruption incidents.
91.8%
Security training
Completion rate for information security awareness.
0
ICO breaches
Zero data breaches reported. 3 DSARs processed on time.
Anti-bribery risk assessment conducted November 2024 (country, sectoral, transactional, internal risks). Gifts/hospitality approval procedure in place. All new employees acknowledge the Anti-Bribery and Fraud Policy at onboarding. No recurring formal training programme was in place during 2025.
Anti-Bribery and Fraud · Anti-Modern Slavery · Data Protection · Information Security · Conflict of Interest · Enterprise Risk Management · Business Continuity Management. All available to clients and partners on request.
Ethics & Governance
Procurement concentrated in cloud infrastructure (35.7% of emissions), SaaS, professional services, and contractors. Supplier Code of Conduct (Sep 2024) covers workforce standards, environmental responsibility, anti-bribery, data protection, and supply chain due diligence. Suppliers must assess their own upstream supply chain.
Systematic sustainability assessments were not in place during 2025. For cloud providers, we engage through the 24/7 Carbon-Free Energy Compact.
Where we fell short
Sustainable procurement
No standalone policy during 2025. No systematic supplier assessments. EcoVadis: 0/100.
Ethics reporting
First year publishing quantitative metrics. No recurring anti-bribery training.
Training data
Hours per employee not tracked centrally during 2025.
Employee engagement
eNPS -31, engagement 6.39/10. Reward, workload, and communication.
Environmental data
Commuting data is a proxy. Renewable energy confirmed at 2 of 4 UK sites. Customer Scope 3.11 excluded.
Methodology
Calendar year 2025. GHG Protocol Corporate Standard, operational control. UK: DESNZ 2025 factors. Cloud: AWS CCFT actual + EXIOBASE v3.8 (GCP). Purchased services: EXIOBASE v3.8 GBP (94%) + BEIS/EPA (6%). SBTi validated 2021 (KALU-UNI-001-OFF). Commuting/WFH: 2023–24 proxy. Workforce: 645 employees (Workday). Engagement: Leapsome. Gender pay gap: 5 April 2025 snapshot.
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