Whitepaper by The Mobility House Energy and Sigenergy: Bidirectional charging as a key technology for global energy flexibility

The Mobility House Energy, a leading aggregation and trading company for energy flexibility from (EV) batteries, has published a whitepaper entitled “Fundamentals and Applications of Bi-Directional Charging” together with Sigenergy. The English-language publication brings together practical experience from commercial Vehicle-to-Grid (V2G) applications in Europe and shows how Vehicle-to-Everything (V2X) technologies can become a central pillar of a flexible, renewable energy system.

As electrification increases and renewable shares grow, demand for rapidly available, decentralised flexibility is rising. Bidirectional charging can make a meaningful contribution – not as a hardware topic alone, but as an integrated system capability combining controllable technology, standardised interfaces and reliable integration into energy markets. This is exactly where The Mobility House Energy’s core competency lies: the aggregation, optimisation and trading of flexibility from many individual storage assets – from vehicle batteries to large-scale stationary battery storage systems. Integrating these batteries also eases pressure on the energy system by storing surplus electricity from renewable sources.

The whitepaper covers, among other topics:

• A clear overview of V2G and V2X technologies, system architectures and relevant standards (including ISO 15118-20)
• Reference points for collaboration across the ecosystem – from OEMs and charging infrastructure to grid operators and energy providers
• An assessment of technical maturity, regulatory frameworks and market development through 2030 – with a focus on the practical scaling of V2G

While V2G in Europe is currently scaling mainly from pilots and early commercial applications, international pressure is increasing: China has highly ambitious V2G targets. The market there is still in an early implementation phase – so far, roughly tens of thousands of vehicles are participating in active V2G programmes – yet against a backdrop of around 30 to 37 million New Energy Vehicles and around 13 to 14 million charging points that could potentially be used for V2G in the future. For European players, this is a clear signal to move faster from demonstrators to scalable products and market-based models.

One chapter of the whitepaper describes, by way of example, DC-coupled system architectures as addressed by Sigenergy and The Mobility House Energy: integrating PV, home storage and a bidirectional DC charging module into a shared energy system. Such approaches can help reduce conversion losses and simplify system integration – however, what remains decisive is interoperable implementation based on standards and safe, market-oriented control in operation.

The whitepaper underlines: bidirectional charging is no longer a theoretical vision of the future. It is a scalable use case – provided the technical implementation is consistently linked with the aggregation, optimisation and trading of flexibility in the energy system. The Mobility House Energy contributes many years of expertise and systems for flexibility aggregation and trading. In 2024, the company, together with Renault and Mobilize, brought the world’s first V2G product for end customers to market in France. In doing so, the company consistently pursues the “zero zero” vision: zero emissions at zero cost. Integrating vehicle and stationary batteries makes it possible to store surplus energy from renewable sources and feed it back into the grid as needed. This stabilises the energy system, optimises the use of existing resources and lowers overall costs for the energy and mobility system, as no new fossil fuels or additional infrastructure are required. Sigenergy complements this with its expertise in components and energy-management approaches at device and system level.

Download the whitepaper here!