Yet another study shows plug-in hybrids aren’t as clean as we thought
A new report by the European Commission adds yet another real-world data point showing that plug-in hybrid electric vehicles create much more emissions than we previously thought – by an average of 3.5 times as much as lab testing indicates.
Plug-in hybrids (PHEVs) are thought to bring the best of both worlds – a large enough battery to take care of your daily tasks, paired with a gas engine for longer trips or when you can’t find a charger. There are downsides in cost and complexity, but the powertrain choice does provide more options than others.
For this reason, PHEVs have long been thought of as an ideal transitional technology between gas vehicles and electric ones. People would be able to do most of their driving on electricity and only occasionally use gas.
The problem is… that doesn’t happen.
Multiple recent studies have shown that in the real world, plug-in hybrids pollute much more than their labels would indicate – though still less than pure-fossil vehicles – both because they overstate their capabilities in electric-only mode and because people simply don’t plug them in.
The latter is referred to as “utility factor” – the percentage of time that a PHEV gets used on electric drive rather than its combustion engine. In reality, PHEV utility factors are much lower than emissions testing credits them for, which means that in practice, PHEV emissions are much higher because they use the combustion engine more often than expected.
Previous studies were done in Europe by T&E and TU Graz (T&E has done multiple studies on this) and by the ICCT utilizing data from California. In each case, PHEV emissions and fuel use were much higher than expected, though it differs for various regions and car models. Models with larger batteries – “EV-first” designs – tended to have higher utility factors and lower emissions.
However, this report is important because it was done by a government entity, rather than by NGOs.
The new EU Commission report shows “emissions gaps” – that is, the difference between expected and real-world emissions for PHEVs – that are very high in all examined countries in Europe. Gaps fell between 176% (Finland), up to 287% (Poland).
The “emissions gap” differs from country to country due to patterns in vehicle use. For example, Germany tends to have lower utility factors, and thus a high emissions gap of 284%, because PHEVs are often leased as company cars, giving companies significant benefits, and then driven like gas cars and never plugged in. But the numbers are high regardless of country.
An emissions gap also exists for petrol- and diesel-fueled vehicles, with each of them also emitting more than WLTP numbers would indicate – and therefore getting lower mileage, and having higher fuel costs, than consumers would expect by looking at the label. But those emit about ~20% more, whereas PHEVs emit on average over 200% more.
This data is particularly relevant given recent discussions about regulatory requirements for vehicles. Regulators have softened some targets, in many cases giving PHEVs additional credit for emissions reductions that data shows us are underwhelming.
For example, California’s 2035 phaseout for gas vehicles still allows 20% of cars to be PHEVs – which we now have additional evidence will emit much more than expected. Though those rules do have certain minimum requirements for PHEVs (which nevertheless could perhaps use updating to reflect real-world findings).
Also, the EPA’s new rules, finalized last week, offered multiple pathways for manufacturers to comply, one of which relies heavily on PHEVs. But it also explicitly acknowledged that current utility factor estimates are too high and need to be revised downwards, but pushed back implementation of the new utility factors to 2031 instead of 2027 – allowing PHEVs to continue to pollute for years further.
The Commission’s report will be used in future EU regulations to inform utility factors in official test procedures. A rule change is already in the plans for 2025, but the report says that the rules might need to “further adjusted” given the real-world data within it.
Electrek’s Take
We’ve long thought that PHEVs are only good if they actually get used, and in order to do that, you need to design PHEVs to be used on battery charge only.
There are a few good PHEVs that fit this description, like the Chevy Volt and BMW i3, and these models tend to have much higher utility factors than other models do. But cars which, for example, kick you out of EV mode as soon as you hit the accelerator, aren’t particularly useful in terms of avoiding fossil fuel use.
And now here we have data to confirm, once again, that PHEVs are not as clean as some – like Toyota, for example – might have you think.
I certainly know people who have had less-serious PHEVs and never or rarely plugged them in – like a friend who had an early Plug-in Prius that he didn’t even bother to plug into 120V because of its minuscule battery, and because his car’s electricity use wouldn’t be enough to make it worthwhile to install a charger and set up time-of-use charging for discounted electricity as his house.
Fortunately (?), PHEVs have also historically had the least consumer uptake, so there aren’t that many cars currently affected by this undercounting of emissions. But it is still important that we arrange regulations around this new knowledge of real-world emissions.
While EV and conventional fossil-fueled hybrid sales are both rising rapidly, PHEV sales have had significantly more modest sales growth. Part of the reason for this is likely because people who aren’t interested in plugging in will just buy a conventional hybrid, and people who are interested in plugging in would prefer the simplicity of full electric drive.
There are solutions going forward, though. As suggested in the previous T&E and ICCT studies, PHEVs should be designed with an electric-first mentality, with large enough batteries to be practical for everyday use, and regulatory schemes should use these real-world values and be centered around ensuring these vehicles be used on electric power instead of being given tax breaks for just driving around on gas. Regulators should change their schemes to take this knowledge into account – and they should do it now, not in 2031.
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Global renewable developer and energy giant RWE has halted its US offshore wind operations “for the time being” because of the “political environment” the Trump administration has created.
RWE, Germany’s biggest electricity producer, said in March that it had dialed back its US offshore wind activities. But now, CEO Marcus Krebber said in a speech transcript, which he’ll deliver at the company’s Annual General Meeting in Essen on April 30, that its US offshore wind business is now closed (but it wasn’t all bad news):
In the US, where we have stopped our offshore activities for the time being, our business in onshore wind, solar energy, and battery storage has so far been developing very dynamically. At the start of this year, we reached an important milestone when our US generation capacity hit the 10 gigawatt mark. The construction of a further 4 gigawatts is secured.
He went on to say that renewables have created regional value and jobs, but that the company remains “cautious given the political developments.” RWE has introduced more stringent requirements for future US investments:
All necessary federal permits must be in place. Tax credits must be safe harbored and all relevant tariff risks mitigated. In addition, onshore wind and solar projects must have secured offtake at the time of the investment decision. Only if these conditions are met will further investments be possible, given the political environment.
About half of RWE’s installed renewable capacity is in the US, where it’s the third-largest renewable energy company through its subsidiary, RWE Clean Energy. RWE holds the rights to develop US offshore wind projects in New York, Louisiana, and California.
RWE paid $1.1 billion for the New York lease area in 2022, where it’s meant to develop the 3 gigawatt (GW) Community Offshore Wind with the UK’s National Grid. Community Offshore Wind was projected to come online in the early 2030s and expected to power more than a million homes.
The developer paid $5.6 billion for the Louisiana lease in the Gulf of Mexico in 2023 as the lone bidder for development rights, and the Canopy Offshore Wind project off Northern California was not expected to be completed for another decade.
Read more: Trump admin halts $5 billion NY offshore wind project mid-build
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It’s that time of year again, time for events across the country to show off electric vehicles at Drive Electric Earth Month.
Drive Electric Earth Month is an offshoot of Drive Electric Week, a long-running annual tradition hosting meetups mostly in the US, but also occasionally in other countries. It started as Drive Electric Earth Day, but since not every event can happen on the same day, they went ahead and extended it to encompass “Earth Month” events that happen across the month of April. It’s all organized by Plug In America, the Sierra Club, the Electric Vehicle Association, EV Hybrid Noire, and Drive Electric USA.
Events consist of general Earth Day-style community celebrations, EV Ride & Drives where you can test drive several EVs in one place, and opportunities to talk to EV owners and ask them questions about what it’s like to live with an EV, away from the pressure of a dealership.
This month, there are 158 events registered across the US and 1 in Mexico (including one online webinar about things to consider when purchasing an EV).
Events have been happening all month, but the biggest weekend is this upcoming one, APril 26-27.
One really neat event was the Asheville event, which showcased the resiliency of EVs in an area devastated by Hurricane Helene, which was made more severe by climate change. That event was attended by the Rivian R1T which famously got dragged 100 feet submerged in mud and came out running fine.
But the bulk of the events happened on the weekends surrounding Earth Day, April 22, so there were several last weekend and will be even more this upcoming weekend.
There are plenty of events in the big cities where you’d expect, but Plug In America wanted to highlight a few of the events in smaller places around the country. Here’s a sampling of upcoming events:
- Big Island EV – Cruise and Picnic in Waimea, HI on April 26, 10am-1pm – EV drivers will congregate in various places around the Big Island (Kona, Waimea, Waikoloa and Hilo), then drive up Saddle Road to the Gil Kahele Recreation Area on Mauna Kea for a potluck and a chance to talk about the experience of owning EVs on the Big Island.
- Santa Barbara Earth Day 2025 and Green Car Show in Santa Barbara, CA on April 26-27, 11am-8pm – This is part of Santa Barbara’s Earth Day celebration, which routinely attracts 30,000 participants and is one of the longest-running Earth Day celebrations on the planet. The Green Car Show includes ride & drives and an “Owners Corner” where owners can showcase their EVs and attendees can check them out and ask questions.
- Earth Day’25 – EV’s role in a sustainable future in Queretaro City, Mexico on April 26, 9am-4pm – The sole Mexican event, this is a combined in-person/online seminar at the Querétaro Institute of Technology.
- Norman Earth Day Festival in Norman, OK on April 27, 12-5pm – Another municipal Earth Day festival, with hands-on activities for kids to learn about the environment. A portion of the parking lot reserved for an EV car show for EV owners who pre-register to show off their vehicles.
- Oregon Electric Vehicle Association Test Drive & Information Expo in Portland, OR on April 27, 10am-4pm – This one is at Daimler Truck’s North American HQ, and will have several EVs for test drives, owner displays (including DIY gas-to-EV conversions), and keynote presentations by EV experts. They’ll even have a 1914 Detroit Electric EV available for test rides!
- And, we at Electrek want to give a shoutout to Rove’s EV Drive Days in Santa Ana 10am-3pm April 28 – ROVE is the company behind the “full-service” EV charging concept that we’ve talked about several times here on Electrek, and we like what they’re doing for EV charging. They’ve hosted a few community events, and this is their contribution to Earth Month.
Each event has a different assortment of activities (e.g. test drives won’t be available at every event, generally just the larger ones attended by local dealerships), so be sure to check the events page to see what the plan is for your local event.
These events have offered a great way to connect with owners and see the newest electric vehicle tech, and even get a chance to do test rides and drives in person. Attendees got to hear unfiltered information from actual owners about the benefits and trials of owning EVs, allowing for longer and more genuine (and often more knowledgeable) conversations than one might normally encounter at a dealership.
And if you’re an owner – you can show off your car and answer those questions for interested onlookers.
To view all the events and see what’s happening in your area, you can check out the list of events or the events map. You can also sign up to volunteer at your local events, and if you plan to show off your electric car, you can RSVP on each event page and list the vehicle that you plan to show (or see what other vehicles have already registered).
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