RESEARCH
Energy: Do major organizations agree on how much solar capacity was added globally in 2025?
Ran a Delta Engine consensus check on whether four leading energy organizations — IRENA, IEA, Ember, and BloombergNEF — agree on total global solar PV capacity added in 2025. All four confirm 2025 was a record year for solar. But their published figures diverge significantly: from 511 GW (IRENA) to 698 GW (BloombergNEF). The engine returned INDETERMINATE (deltaFinal=0.309), correctly surfacing that this is a data methodology disagreement, not a factual contradiction — each agency measures and counts solar installations differently.
Findings
- All four sources agree that global solar capacity additions set a new all-time annual record in 2025. The factual claim — 'solar had its best year ever' — is universal consensus.
- Delta Engine returned INDETERMINATE (deltaFinal=0.309 vs 0.05 threshold) because reported GW figures span a 37% range: IRENA 511 GW, IEA 605 GW, Ember 647 GW, BloombergNEF 698 GW — driven by different data collection and accounting methodologies, not factual disagreement.
- IRENA uses official government-submitted statistics which tend to lag and exclude unregistered distributed solar; Ember and BNEF pull from broader pipelines including satellite tracking and industry surveys, capturing more of the distributed rooftop and agri-solar installations China deployed at scale in 2025.
- For energy investors, project developers, and policymakers: when four credible agencies report figures varying by 187 GW for the same calendar year, any model citing only one source without disclosing the methodology gap is working from incomplete information.
Delta Engine result
↔ Divergence Detected — Δ 0.3093 (threshold 0.05)
- IRENA (Renewable Capacity Statistics 2026) 511
- IEA (Global Energy Review 2026) 605
- Ember (Global Electricity Review 2026) 647
- BloombergNEF (New Energy Outlook 2026) 698