Plug-in hybrids (PHEVs) generally produce fewer emissions than traditional hybrids (HEVs) over their lifespan, though the exact difference depends on usage patterns and energy sources. Here’s a breakdown:
1. Operational Emissions
- PHEVs can drive shorter distances (typically 20–50 miles) on electric power alone, producing zero direct emissions in EV mode. When using gasoline, they function like HEVs, but their ability to charge externally reduces reliance on fossil fuels compared to HEVs.
- HEVs rely entirely on regenerative braking and engine-powered charging, meaning gasoline use is constant, leading to higher emissions per mile. For example, a traditional hybrid emits ~270 grams of CO₂ per mile compared to ~230 grams for a PHEV.
2. Lifetime Emissions
- PHEVs reduce lifetime emissions by ~46% compared to gas-powered vehicles in the U.S., slightly outperforming battery EVs (BEVs) in some cases due to smaller batteries requiring fewer resources. Over a 180,000-mile lifespan, a PHEV emits ~45.6 tons of CO₂ versus ~53.6 tons for an HEV.
- HEVs lack plug-in charging capability, leading to higher cumulative emissions as they burn gasoline more frequently, especially on longer trips.
3. Fuel Efficiency
PHEVs achieve better mileage in electric mode, but their advantage diminishes if not regularly plugged in. HEVs, while less efficient than PHEVs in ideal conditions, provide consistent fuel savings compared to non-hybrid vehicles.
In summary, PHEVs generally emit less CO₂ than HEVs, particularly when charged frequently using low-carbon electricity. However, their environmental edge depends on access to charging infrastructure and driver habits.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/how-do-the-emissions-of-plug-in-hybrids-compare-to-those-of-traditional-hybrids/
