Why Bidirectional Charging Is No Longer Just an Option

IEA's Global EV Outlook 2026 positions V2G as essential to managing surging EV electricity demand

22 May 2026

The electric vehicle has long been sold as an ecological panacea, yet a transition that solves one resource dilemma is rapidly creating another. According to the International Energy Agency’s latest global outlook, published on May 20th, the electricity required to fuel the world’s burgeoning fleet of electric cars is set to exceed 1,500 terawatt-hours by 2035. This represents a sixfold increase from last year’s levels, a surge in demand that risks buckling power grids precisely when they are most strained.

Building more power lines and generation plants is the conventional response to this problem. In America, grid operators face a daunting logistical hurdle. Meeting projected targets would require installing some 405,000 public charging points annually through 2035, matching the country's historic peak rollout rate. A simpler, cheaper solution may lie within the cars themselves.

Known as vehicle-to-grid technology, or V2G, the concept allows parked vehicles to function as giant, collective batteries, sucking up excess renewable energy when sun and wind are abundant, and pumping it back into the network during evening peaks. Until recently, carmakers and fleet operators resisted the idea, fearing that the constant cycling of electricity would wear out expensive car batteries and void warranties.

Dismantling that worry, the energy agency’s findings show that well-managed vehicle-to-grid setups do not accelerate battery degradation. Because enrolled vehicles generally operate at lower average states of charge, they suffer less from the chemical aging that causes standard battery wear.

Bureaucratic obstacles, rather than chemical ones, now form the primary barrier. Commercial bidirectional charging for private owners only began to trickle into the market last year. The global technical standard meant to enable communication between cars and chargers is inconsistently applied by manufacturers. Furthermore, regulatory frameworks that allow cars to sell power back to electricity wholesale markets remain fragmented.

In America, where electric models accounted for just under 10% of car sales last year, a critical tax credit for installing chargers in rural and low-income communities is due to expire on June 30th. This deadline brings immediate budget pressure to an already fraught transition. The technology to turn cars into grid stabilizers is ready. Whether the regulatory systems can be rewired to accommodate them remains to be seen.