Denmark is turning the parked electric car into a battery-market test. Charging provider Clever and Polestar have started a technical pilot that will put bidirectional charging into selected Danish homes using the Polestar 4 , DC wallboxes, and a full vehicle-to-everything setup. The project matters because it treats EV batteries as distributed storage, not just transport hardware. The trial will test vehicle-to-home power during expensive demand periods, vehicle-to-grid exports during grid stress, and household backup during outages. Clever says the pilot will run until autumn 2026, with commercial V2X solutions targeted for 2027. AI-generated image The Clever and Polestar pilot is designed to test home backup, peak shaving, and grid exports from a parked EV battery. 2026 Pilot runs to autumn 3 V2X use cases 2027 Commercial target 600k+ EV power banks on Danish roads What Clever and Polestar Are Testing The Danish project is built around a simple premise: most EV batteries spend most of their lives parked, and the energy inside them is large compared with a normal residential battery. Clever framed Denmark's EV fleet as more than 600,000 large power banks already moving through the country. The pilot asks whether a small slice of that capacity can be made useful to households and the grid without making car ownership inconvenient. Selected households will receive bidirectional DC wallboxes that allow energy to move both into and out of the vehicle. The companies will test three modes. In vehicle-to-home mode, the car can discharge into the house when electricity prices or grid demand are high. In vehicle-to-grid mode, the car can export energy back to the public grid during peak load windows. In island mode, the car can supply emergency power to a home during an outage. The Polestar 4 is the test vehicle, even though bidirectional charging is not yet a standard feature on customer cars. Polestar has enabled the function for the pilot and says broader commercial availability could arrive later through software updates. That detail is important. For automakers, V2X is not only a charger question. It touches battery warranty rules, thermal management, communications, metering, cybersecurity, and how much control the driver is willing to hand to an energy service provider. The simple read This is not just a home charging pilot. It is a test of whether an EV maker, a charging operator, a home energy system, and the grid can coordinate one battery as transport, backup power, and flexible storage. Why the Battery Industry Should Care Bidirectional charging changes the battery value chain because it gives an EV pack a second revenue logic. A conventional EV battery creates value by moving a driver. A V2X-capable pack can also reduce household bills, provide backup power, absorb excess renewable generation, and sell flexibility into power markets. That does not make every vehicle a power plant, but it does make parked cars part of the same conversation as residential storage, virtual power plants, and distribution grid flexibility. The timing is useful for Europe. Solar generation keeps rising, power prices are more volatile, and grid operators increasingly need flexible demand that can respond faster than new wires can be built. Denmark is a good test market because it has high renewable penetration, digital energy infrastructure, and a customer base already used to dynamic electricity prices. If the economics work there, the model could travel to other European markets with similar price signals. AI-generated image There is also a manufacturing angle. Automakers that support V2X need battery packs designed for extra cycling and controls that protect state of charge for mobility. Charging companies need hardware that can safely export DC or AC power while meeting grid codes. Utilities need clean data on what energy was consumed for driving and what energy was temporarily stored and returned to the system. Without that accounting, drivers can face double charges or unclear compensation. That accounting problem is one of the reasons V2G has moved more slowly than the technology hype suggested. The battery can usually respond fast enough. The harder work is aligning incentives among the driver, automaker, charger operator, aggregator, utility, retailer, and market operator. Clever's commercial target for 2027 suggests the company is not treating this as a science demo. It is trying to find the product shape customers might actually buy. Europe Is Moving From Pilots to Market Tests The Danish project lands during a busy period for bidirectional charging in Europe. In Germany, Enercity recently used a fleet of twelve Volkswagen ID. Buzz vehicles as an aggregated storage system in Hanover. The fleet reached 0.132 MW of technical aggregation capacity, traded 0.1 MW on the intraday power market, and completed 145 trading transactions over a 53-hour test. Revenue was modest, but the point was operational proof, not profit maximization. That German test showed why fleets may scale before private households. Company vehicles often park in predictable locations, return to depots at known times, and can be managed as a group. Private cars are less predictable and more personal. A home customer will care less about market theory than whether the car is ready in the morning and whether battery wear is compensated. Clever and Polestar are aiming straight at that consumer trust problem by testing home backup and bill savings alongside grid exports. What has to work • Charger communication and metering must be reliable enough for billing. • The vehicle must preserve the driver's minimum state of charge. • Battery warranty terms must cover managed export cycling. • Grid fees and taxes must avoid punishing stored energy twice. What success would mean • EVs become part of the residential storage market. • Utilities gain fast local flexibility without waiting for new grid batteries. • Automakers gain a software feature that can affect total ownership cost. • Charging networks move deeper into energy services. AI-generated image The Commercial Question Comes Next The best version of V2X is almost invisible to the driver. The car charges when electricity is cheap or clean, holds enough range for planned trips, and exports only when the driver has opted in. The household sees backup value and lower bills. The grid sees a controllable resource. The battery supplier sees managed cycling rather than random abuse. That balance is hard, but it is also why the prize is large. For CurrentCells, the larger battery industry signal is that storage capacity is no longer confined to stationary boxes. EV packs, home systems, and grid batteries are beginning to compete and cooperate in the same flexibility markets. Clever and Polestar are not proving the whole model in one pilot, but they are testing the exact interfaces that decide whether mobile batteries become useful grid assets or remain a recurring conference slide. By autumn, the useful data will not be limited to kilowatt-hours exported. The more valuable answers will be practical: how often customers let the car discharge, how much backup capability they value, how much compensation changes behavior, and whether software can manage the battery without making the driver think about it every day. If those answers are positive, Denmark's first complete V2X pilot could become a template for the next phase of EV battery monetization. AI-generated image Why it matters Every bidirectional charging pilot tests more than a plug. It tests whether the battery industry can turn millions of parked EV packs into flexible storage without compromising mobility, warranties, or customer trust.