Factor-Set Registry & Diff Engine

Rule BR-050 & §6.2 mandate governed emission conversion factors. Automated diff detection flags material shifts (≥10%) in amber before activation.

ACTIVE PRODUCTION SET

UK DESNZ 2026 Conversion Factors (Corrected 31 July 2026)

Source: Department for Energy Security and Net Zero · Effective: 2026-06-11 to 2027-06-10

SHA256: e8c92a...4b12Approved by Sustainability Lead

Activity-Year Rule (§6.2):

January 2027 events are estimated using the 2026 set until the official June 2027 set is activated. Material shifts trigger an automated restatement notice to affected event organizers.

Comparative Shift Analysis (DESNZ 2026 vs DESNZ 2024 Stale Baseline)

Shifts ≥ 10% highlighted in amber with automated restatement warning flag

UK DESNZ — 2026 (Corrected 31 July 2026)

Effective: 2026-06-11 to 2027-06-10 · Published: 2026-06-11

Active RegistrySource Workbook

Category	Activity / Fuel	Unit Basis	Previous Factor	Current Factor	Shift (%)
Electricity	UK Grid Electricity generation	kg CO₂e / kWh	0.20705	0.15428	-25.5%
Passenger Transport	National Rail (passenger-km)	kg CO₂e / p-km	0.03512	0.03549	+1.1%
Passenger Transport	Average Car (petrol, vehicle-km)	kg CO₂e / v-km	0.17042	0.16912	-0.8%
Passenger Transport	Domestic Flight (economy, with RF)	kg CO₂e / p-km	0.24610	0.24581	-0.1%
Accommodation	Hotel night (UK average)	kg CO₂e / room-night	14.72000	10.42000	-29.2%

Governed under DESNZ / SEAI annual release cycles. Estimates freeze their assigned factor_set_id and are never silently altered without a logged restatement notice.