Nonetheless Smoking: The PHEV Emissions Scandal Continues

Help CleanTechnica’s work by way of a Substack subscription, on Patreon, or on Stripe. Assist us produce the entire high-quality, unique content material we publish week after week regardless of the challenges of content-scraping AI, delinquent media, inflation, and different hurdles.

Abstract

Evaluation of official 2024 real-world information reveals that plug-in hybrid electrical automobiles (PHEVs) proceed to exhibit a widening hole between real-world efficiency and official WLTP (Worldwide Harmonised Mild Automobile Take a look at Process) testing values. On common, real-world emissions for 2024 PHEV fashions have been practically six occasions greater than official figures. The widening hole is pushed largely by the market shift towards heavier, higher-power, longer-range fashions that lack ample electrical motor energy. These empirical findings underscore the need of the upcoming November 2026/27 utility issue (UF) correction to align official accounting with precise local weather impression and incentivize significant automobile efficiency enhancements.

Correcting the plug-in hybrid electrical automobile UF doesn’t threaten the European PHEV producers, it ensures that PHEV design and efficiency are improved. Market proof from the previous 2025 UF correction reveals that CO₂ emissions could be lowered by way of higher know-how and longer electrical vary to offset the rise in official CO₂ emissions from the UF correction.

The UF corrections encourage producers to develop PHEVs with longer electrical ranges. Nevertheless, demand additionally determines which fashions succeed, and taxation performs a key function in influencing patrons’ selections. In most Member States, present PHEV taxation doesn’t stop high-emitting fashions from receiving extra beneficial therapy than best-performing PHEVs.

Actual-world gasoline consumption information reveal that PHEVs local weather advantages have been overstated and have emissions near conventional combustion automobiles:

• Common real-world emissions of PHEV bought in 2024 have been 6 occasions greater than what formally reported in WLTP testing. PHEVs drive solely 27% of the time in pure electrical mode.
• Freezing the UF to the 2025/26 correction would underestimate actual world emissions by 56%.
• Longer vary fashions had greater emissions gaps between actual world versus official emissions: +52% hole for PHEV with vary above 70 km (with the right November 2026/7 UF) versus +35% hole for vary beneath 70 km. The typical PHEV vary grew from 58 km to 75 km between 2021 and 2024, so lengthy vary fashions have been chargeable for greater than half of the 2024 hole.
• Electrical-to-combustion energy ratio is a greater indicator of real-world efficiency than electrical vary: PHEVs with 25% extra electrical than combustion energy emit simply 95 gCO₂/km in real-world, a 3rd of the common PHEV. Cost-depleting mode (electrical and hybrid functioning) emissions have been 20 g/km or 3 times decrease than the common for this mode.

The proof from latest PHEV mannequin launched after the 2025 UF correction means that the UF correction incentivised technical enhancements:

• Some carmakers have elevated the electrical vary of their automobiles from 63 km to 117 km (+85%) to offset the impression of the primary UF correction.
• The common battery dimension in upgraded 2026 fashions has risen from 14 kWh to 24 kWh, or +68% (in comparison with previous variants).
• Three-quarters of the rise in official CO₂ emissions brought on by the corrected UF has been offset for the fashions upgraded with bigger batteries. This saved many fashions beneath 50 gCO₂/km.
• The elevated battery dimension required for this improve solely elevated automobile worth by 2%.

T&E’s evaluation reveals that, by 2030, electrical ranges of round 140–220 km will maintain PHEVs at or beneath 50 gCO₂/km. This enhance in vary is in keeping with the anticipated progress in battery and automobile know-how. If PHEVs are fitted with higher know-how, the vary enhance wanted is restricted to about 180 km. The ultimate UF correction beginning in November 2026 not solely harmonises regulation with real-world efficiency, thus correcting a crucial regulatory misstep, but it surely additionally encourages the event of higher-performance PHEVs.

Crucially, freezing the UF is the one change to the automobile CO₂ framework that may have the most important impression on 2030 and 2035 BEV gross sales. In complete it might decrease BEV gross sales by 13 proportion factors in 2030 and 18 proportion factors in 2035 within the automobile CO₂ proposal of EPP rapporteur Massimiliano Salini.

Present tax methods don’t reward the best-performing PHEVs and sometimes present them with related therapy to pure electrical automobiles:

• Corporations are the principle patrons of PHEVs in Europe. Within the first half of 2026, they accounted for 71% of latest PHEV registrations within the EU, properly above their 58% share of the general new-car market.
• 24 out of 27 Member States present PHEVs with preferential tax therapy by way of no less than one tax measure, however solely 12 use a ≤50 gCO₂/km threshold or stricter.
• 21 Member States use CO₂ emissions instantly in no less than one of many 5 tax devices analysed, which means that correct CO₂ values are important for efficient PHEV taxation.
• Solely Portugal and Spain require each a CO₂ threshold and a minimal electrical vary for PHEV tax advantages, though Spain’s vary requirement is especially weak at simply 15 km.
• In 19 of the 27 Member States, the annual tax distinction between a company PHEV and a BEV is sort of the identical or beneath €1,000. These international locations account for nearly 90% of EU company PHEV registrations.
• A number of main PHEV markets barely enhance taxation when official CO₂ emissions rise below the 11.2026/7 UF, limiting each the demand sign for better-performing PHEVs and the potential enhance in authorities revenues.

Key suggestions

The EU ought to maintain the deliberate correction of the PHEV UFs: European co-legislators shouldn’t intervene with the deliberate and permitted upcoming correction of the UF within the present Automotive bundle discussions.

The UF is a technological methodology that’s designed to make sure the official PHEV emissions match real-world emissions. It shouldn’t be for politicians to intervene with the applying of this technical methodology. As a substitute, co-legislators ought to merely reaffirm their political help for a sturdy, science-based system that ensures that official emission accounting displays real-world efficiency.

Taxation ought to complement the UF correction through the use of stricter CO₂ and electric-range standards to raised distinguish between PHEVs. This is able to make sure that the high-emitting fashions don’t obtain extra beneficial therapy than best-performing PHEVs.

By Yoann Gimbert, Principal Analyst, Automobiles, T&E

Learn the complete report.