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        "title": "The Electric Car as an Energy Storage System on Your Doorstep ",
        "url": "https://gfu.de/en/the-electric-car-as-an-energy-storage-system-on-your-doorstep/",
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        "language": "en_US",
        "published": "2026-07-09T07:04:00+02:00",
        "modified": "2026-07-07T19:17:44+02:00",
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        "meta_title": "Electric Car Energy Storage: EV Batteries for the Grid",
        "meta_description": "Discover how electric car energy storage can store renewable power, cut household costs, support the grid, and enable V2H, V2G, and bidirectional charging.",
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    "content": {
        "excerpt": "Around 120 gigawatt-hours of unused storage capacity are already sitting outside our doors: the batteries of electric vehicles. How EVs can become a swarm storage system for the energy transition and what V2H, V2G, and the new charging standard from 2027 mean.",
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        "full_text_html": "\n<section class=\"block block--text block--bg-transparent block--pad-none block--text--layout-split block--text--text-anthrazit block--text--no-button\">\n    <div class=\"container block__inner\">\n\n        <div class=\"text__content\">\n            \n            \n                            <div class=\"text__body\"><p>Frankfurt am Main, July 9, 2026 – In the course of the day, energy from renewable sources is not always available when demand for energy is high. These gaps can be offset by energy storage systems. The success of the energy transition therefore also depends on a sufficiently large capacity of energy storage systems. Grid operators and energy suppliers are currently building battery storage systems with large capacities in order to make the fullest possible use of the renewable energy generated and save fossil fuels.</p>\n</div>\n                    </div>\n\n        \n    </div>\n</section>\n\n\n\n<div class=\"block block--spacer block--spacer-50 block--bg-transparent\" style=\"height: 50px\" aria-hidden=\"true\">\n    </div>\n\n\n\n<section class=\"block block--text block--bg-transparent block--pad-none block--text--layout-split block--text--text-anthrazit block--text--no-button\">\n    <div class=\"container block__inner\">\n\n        <div class=\"text__content\">\n            \n            <h2 class=\"text__heading\">Think inside the box</h2>\n                            <div class=\"text__body\"><p>However, many storage systems do not need to be built from scratch; they already exist and their number is constantly growing: the batteries of electric vehicles. In everyday life, cars are parked unused for a large percentage of the day and could therefore be used for the temporary storage of energy – for example, self-generated energy from photovoltaics. This helps relieve the burden on grids and contributes to lowering energy costs for households. <strong>According to Mark Junker, Head of the Department of Grid Integration of Batteries and Storage System Analysis at RWTH Aachen University, this already represents a “very, very relevant contribution” of currently around 120 gigawatt hours of storage capacity. This is many times the capacity of stationary storage systems, which is around 25 gigawatt hours (as of early 2026, according to RWTH Aachen University).</strong> Prerequisite: The electric car and the wallbox must be suitable for bidirectional charging, and an intelligent home energy management system (HEMS) is needed for control.</p>\n</div>\n                    </div>\n\n        \n    </div>\n</section>\n\n\n\n<div class=\"block block--spacer block--spacer-50 block--bg-transparent\" style=\"height: 50px\" aria-hidden=\"true\">\n    </div>\n\n\n\n<section class=\"block block--text block--bg-transparent block--pad-none block--text--layout-split block--text--text-anthrazit block--text--no-button\">\n    <div class=\"container block__inner\">\n\n        <div class=\"text__content\">\n            \n            <h2 class=\"text__heading\">On the benefits of use</h2>\n                            <div class=\"text__body\"><p>Automobile manufacturers and energy suppliers have already launched or announced pilot projects in which owners of electric cars can earn money by making their batteries available as energy storage systems. When the car’s battery is used, this is referred to as “V2H – Vehicle to Home” or “V2G – Vehicle to Grid”. With “V2H”, the car feeds the stored energy into the home for use, while with “V2G” the energy is fed into the power grid. “V2H” optimizes self-consumption, for example of the renewable energy produced by one’s own photovoltaic system. With “V2G”, the batteries in electric cars serve as “swarm storage” and can absorb overproduction from solar and wind power and then feed it back into the grid when demand is high.</p>\n<p>The technical requirements are, in principle, already available. The basis for this is the ISO-15118 standard for public charging points. It will become mandatory for all private and public charging stations from January 1, 2027.</p>\n</div>\n                    </div>\n\n        \n    </div>\n</section>\n\n\n\n<div class=\"block block--spacer block--spacer-50 block--bg-transparent\" style=\"height: 50px\" aria-hidden=\"true\">\n    </div>\n\n\n\n<section class=\"block block--stimmen block--pad-normal block--bg-beige block--stimmen--image-left block--stimmen--single block--pause-on-hover\" data-stimmen-slider=\"1\" data-autoplay-speed=\"8\">\n\n    \n    <div class=\"container stimmen__inner\">\n\n        \n        <div class=\"stimmen__stage\">\n\n            <div class=\"stimmen__slides\" role=\"group\">\n                                    <article class=\"stimmen__slide is-active\" data-slide-index=\"0\" aria-hidden=\"false\">\n                                                    <div class=\"stimmen__avatar\">\n                                <img class=\"stimmen__avatar-img\" src=\"https://gfu.de/wp-content/uploads/2026/06/portrait-2026-carine-chardon-1024x1024.webp\" alt=\"Carine Chardon\" loading=\"lazy\" width=\"1663\" height=\"1663\" />                            </div>\n                        \n                        <div class=\"stimmen__body\">\n                            <p class=\"stimmen__meta\">\n                                <strong class=\"stimmen__name\">Carine Chardon</strong>\n                                                                    <span class=\"stimmen__role\">Managing Director of the industry organization GFU Consumer &amp; Home Electronics</span>\n                                                            </p>\n\n                            <blockquote class=\"stimmen__quote\"><p>»The electric car as an energy storage system was long considered a dream of the future. That dream has come true and is already part of reality. The technical requirements have been met and demand for electric vehicles continues to rise. In this way, e-mobility can also contribute as an important building block of the energy transition.«</p></blockquote>\n\n                                                    </div>\n                    </article>\n                            </div>\n\n            \n        </div>\n    </div>\n</section>\n\n\n\n<div class=\"block block--spacer block--spacer-50 block--bg-transparent\" style=\"height: 50px\" aria-hidden=\"true\">\n    </div>\n\n\n\n<section class=\"block block--text block--bg-transparent block--pad-none block--text--layout-split block--text--text-anthrazit block--text--no-button\">\n    <div class=\"container block__inner\">\n\n        <div class=\"text__content\">\n            \n            <h2 class=\"text__heading\">Together for an energy-efficient solution</h2>\n                            <div class=\"text__body\"><p>For example, the so-called “EEBUS” offers control solutions for these applications, especially for the charging infrastructure for electric vehicles (EVSE). “EEBUS” is an open, manufacturer-independent communication standard for intelligent energy management in buildings. One current hurdle is the ability to feed the stored energy into different grids as well. Here, a joint solution between automobile manufacturers and the operators of charging infrastructure must be found so that the immense storage capacity of electric cars can be used effectively for the energy transition.</p>\n</div>\n                    </div>\n\n        \n    </div>\n</section>\n"
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                "alt": "Mann bedient V2H für die Nutzung der E-Auto-Batterie für die Hausenergie",
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                    "answer": "An electric car can store electricity in its battery and, with bidirectional charging, feed that energy back into a home or the power grid when needed.",
                    "question": "How can an electric car be used as an energy storage system?"
                },
                {
                    "answer": "Bidirectional charging allows electricity to flow both into an electric vehicle battery and back out to a home, building, or electricity grid.",
                    "question": "What is bidirectional charging?"
                },
                {
                    "answer": "Vehicle to Home, or V2H, means an electric car supplies stored battery energy to a household, helping increase self-consumption of solar power and reduce energy costs.",
                    "question": "What does Vehicle to Home mean?"
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                    "answer": "Vehicle to Grid, or V2G, means an electric vehicle feeds stored energy into the public power grid, helping balance supply and demand.",
                    "question": "What does Vehicle to Grid mean?"
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                    "answer": "Electric cars can provide large distributed storage capacity, helping absorb surplus renewable electricity and release it when demand is high.",
                    "question": "Why are electric cars important for the energy transition?"
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                    "answer": "The electric car and wallbox must support bidirectional charging, and an intelligent home energy management system is needed to control energy flows.",
                    "question": "What is needed to use an EV battery for home energy storage?"
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                    "answer": "ISO 15118 supports communication between electric vehicles and charging infrastructure and forms a basis for smart charging and bidirectional energy applications.",
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