A full conversion of the world’s vehicles to electric vehicles would increase electricity demand to a level that would make the necessary grid expansion and power generation capacity impossible to achieve. Photo courtesy of Chargie.

The net-zero crowd wants the United States and Europe to transition to all-electric vehicles by 2035. Achieving that goal would require an enormous expansion of the electrical grid, on a scale that is both financially and physically impractical, if not impossible.

Several reports estimate that a full conversion to electric vehicles would increase overall electricity demand by about 10%, a level they already conclude would be difficult to support. However, those projections overlook a number of factors. In reality, a complete conversion would likely increase electricity demand by multiples of those estimates, transforming an already impractical undertaking into an impossible one.

At the end of 2024, the global electric car fleet had reached almost 58 million, about 4% of the total passenger car fleet. That fleet consumed around 180 TWh of electricity in 2024, representing approximately 0.7% of total global final electricity consumption. Scaling from those figures, if every vehicle on earth were converted to electric, the straight-line projection yields roughly 3,000 to 3,400 TWh of additional annual electricity demand, which is against the IEA’s reported global consumption of 30,856 TWh in 2024 represents approximately a 10% increase.

That straight-line projection is almost certainly a severe undercount, for five structural reasons.

First, long-haul trucking is nearly absent from current EV data. Heavy-duty long-haul trucks generate more than half of road freight oil demand today, yet remain one of the hardest vehicle segments to electrify. In terms of power demand, full truck electrification could add approximately 3% to global electricity consumption by 2050, on top of passenger vehicle demand, with fuel consumption for heavy trucks running 2 to 3 times higher per vehicle than for light trucks, and yearly distances 3 to 5 times greater in long-haul applications. Current EV electricity consumption figures are built almost entirely on passenger car data and carry none of that freight burden.

Second, the second-car effect suppresses current per-EV mileage figures. A large share of today’s EV owners use their electric vehicle for short trips and a second Internal Combustion Engine (ICE) vehicle for longer range, meaning total household vehicle-kilometers are split across two powertrains. Full conversion eliminates that division; every mile, including the longest trips, must be covered by electricity alone.

Third, plug-in hybrids inflate the current consumption baseline in the wrong direction. Many vehicles counted in current EV electricity statistics are PHEVs drawing only partial electricity, with the remainder supplied by gasoline. A full conversion replaces those vehicles with 100% electric demand, making current per-vehicle electricity figures an understatement of what full-EV usage would require.

Fourth, range anxiety suppresses demand today in ways that disappear under full conversion. Some ICE vehicle trips are taken specifically because charging availability or range constraints make the EV impractical for that use case. Full conversion forces all of those trips onto the electric grid regardless of infrastructure readiness.

Fifth, commercial and fleet vehicles carry far heavier duty cycles than the passenger cars dominating current EV data. Delivery vans, municipal buses, agricultural equipment, and construction vehicles operate at higher utilization rates and energy consumption per vehicle than consumer cars from which the 180 TWh baseline is derived. MIT Climate estimates that an all-electric vehicle fleet would account for between 13% and 29% of the United States’ total electricity use, already a multiple of what straight-line scaling from current EV data produces, and that figure covers only the U.S. passenger fleet, not global heavy transport.

For the U.S. alone, a full personal vehicle fleet conversion would require an expansion of the grid by approximately 1 to 2 trillion kWh, a 25 to 35% increase in total U.S. electricity demand. Extrapolated globally across a vehicle mix that is far more freight-heavy and infrastructure-poor than the U.S. passenger fleet, the true demand increase would be substantially larger than any figure derived from today’s 58 million predominantly passenger EVs.

Generating additional electricity is only part of the problem. That power must be transmitted from where it is generated to where millions of vehicles are parked and charging simultaneously, and the transmission system is not being built to handle current demand, let alone a fully electrified fleet. The DOE’s 2024 National Transmission Planning Study found the U.S. needs roughly 5,000 miles of new high-capacity transmission per year to support grid reliability and meet demand. In 2024, it built 888 miles, the third slowest year in 15 years.

Annual transmission spending has hit an all-time high of over $25 billion per year, yet the U.S. builds only 20% as much new transmission in the 2020s as it did in the first half of the 2010s, with the average falling from 1,700 miles per year from 2010 to 2014, to 925 miles from 2015 to 2019, to an average of just 350 miles per year from 2020 to 2023. Nearly 4,000 miles were built in 2013 alone. More money is being spent, less is being built, and the gap between what the grid requires and what is actually being constructed is widening every year. The DOE study calls for at least doubling regional transmission capacity and quadrupling interregional transmission capacity by 2050, before a single additional requirement from full EV conversion is factored in.

The second compounding problem is the fuel source of the grid that would actually be doing the charging. The implicit promise of EV policy is emissions reduction, but that promise depends entirely on what generates the electricity. The IEA confirms that fossil fuels made up nearly 60%  of 2024 global electricity generation, with coal alone accounting for 35%, the largest single source of electricity in the world, a position it has held for more than 50 years.

In 2024, global coal power generation reached nearly 10,700 TWh, a new record high. The countries that would absorb the majority of new vehicle electrification demand are precisely the most coal-dependent. In China, the world’s largest electricity system, coal provided almost 60% of generation in 2024. In India, coal provided nearly three-quarters of electricity supply.

A lifecycle assessment published in Nature’s Communications Earth & Environment found that in China’s coal-heavy northern provinces, the emission intensity of battery electric vehicles is higher than in southern provinces, with sulfur dioxide emissions increasing 10% and particulate matter 20% compared to internal combustion engine vehicles. Charging a global fleet on those grids does not eliminate vehicle emissions, it moves them from the tailpipe to the power plant, with transmission losses added on top.

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