Beyond the Road: The Multisolving Power of Bidirectional Charging

Imagine a world where your car does more than just take you from point A to point B. What if it could also supply energy to your home, reduce your electricity bill or stabilize the energy grid? This is the transformative potential of electric vehicles (EVs) equipped with bidirectional charging technology.

Electric cars are commonly perceived as a cleaner alternative to the traditional Internal Combustion Engine (ICE) vehicle, primarily aimed at reducing CO2-emissions in the transport sector. While driving decarbonization is a crucial benefit of EVs, their potential reaches far beyond that. A lesser known but equally significant feature of EVs is their capacity to serve as mobile energy storing units through bidirectional charging.

Bidirectional charging technology allows electricity to flow in two directions, enabling EV batteries to not only draw power from the grid but also return energy to it (Vehicle-to-Grid (V2G)), feed power to a home or an office building (Vehicle-to-Home (V2H)/Vehicle-to-Building (V2B) or supply it to other devices (Vehicle-to-Device (V2D). This capability transforms EVs into multisolving-tools, extending their utility beyond transportation to include efficient energy management.

Environmental benefits:

A significant challenge in the transition to green energy is the fluctuating availability of renewable energy sources. EVs equipped with bidirectional charging technology can support the optimal use of energy generated from renewables like solar and wind by temporarily storing surplus energy and feeding it back to the grid when needed. This reduces dependency on fossil-fuels during peak demand periods, decreasing the carbon intensity of the electricity system and further driving the integration of renewable energy. Both of these effects are highly valuable in the context of climate change mitigation.

Social benefits:

Bidirectional Charging Technology offers social benefits on multiple levels.

On a micro-level, households can achieve greater energy independence through Vehicle-to-Home

(V2H) technology and power their homes in case of a blackout. Additionally, households can save

money by charging their vehicles when energy prices are low and using that energy when prices are high, freeing up resources for other expenditures.

On a macro-level, V2G technology has the potential to make energy more affordable for everyone.

Francesco La Camera, the Director-General of the International Renewable Energy Agency (IRENA),

already stated in 2021 that renewables are the cheapest source of power (1). However, the currently limited storage infrastructure for renewable energy means that this cheap power is not always readily available. Bidirectional charging technology significantly reduces the need to build new energy storage facilities (2). and extends the availability of the cheapest power, thereby lowering costs for all.

In addition, bidirectional charging can help stabilize the grid. When there are discrepancies between predicted and actual energy generation, grid operators need rapid access to balancing energy to manage grid frequency fluctuations and maintain grid stability (3). The V2G concept allows vehicle batteries to supply this necessary energy to ensure a steady and resilient grid.

Economic benefits:

As alluded to above, bidirectional charging technology yields economic benefits on several fronts. A recent study commissioned by Transport & Environment and carried out by the Fraunhofer

Institute reveals that smart and bidirectional charging at home can lead to significant cost savings on end users’ electricity bills. The most significant advantages arise from enhanced self-consumption of photovoltaic (PV) energy, while dynamic electricity prices also contribute to notable savings (4). According to the study, savings from smart and bidirectional charging for smaller EVs can range from 30€ to 430€ annually, translating to a 4% to 34% reduction in costs (4). Respectively, larger EVs can provide savings between 78€ and 780€ per year, which corresponds to a 7% to 35% decrease in expenses compared to non-optimized charging methods (4). This does not even factor in the potential earnings from selling excess energy back to the grid via V2G services (2).

On a broader scale, the study projects that by 2040, widespread implementation of Vehicle-to-Grid technology could lower annual energy system costs across the EU by 8.6%, resulting in savings of 22.2 billion Euros each year (2,5).

As highlighted, bidirectional charging offers substantial benefits in the social, environmental, and economic spheres. However, despite its growing recognition, several challenges still hinder widespread adoption and the full realization of its advantages. For instance, while the industry has begun developing vehicles and charging infrastructure capable of bidirectional charging, many recently announced EV models and wallboxes primarily focus on vehicle-to-device (V2D) and vehicle-to-home (V2H) applications, with few options available for vehicle-to-grid (V2G) capabilities.4 Moreover, there is a lack of uniform technical standards that guarantee interoperability among different vehicles and charging systems.4 Additionally, as noted by the ADAC, EVs are currently classified as cars rather than battery storage systems, which results in double taxation on stored electricity and hence makes it less profitable to return energy back to the grid (6).

Increasing awareness among the general public and educating end users about the social, environmental, and particularly economic benefits of using EVs as mobile energy storage units can serve as a crucial leverage point in transforming our energy and transportation systems, leading to significant positive impacts on our climate. The cost-saving argument may create a positive feedback loop, encouraging more households to purchase EVs, which in turn accelerates adoption and drives decarbonization.

Another important leverage point is the establishment of regulatory and political frameworks (i.e. uniform technical standards & tax equality for both stationary and mobile storage) that can make the currently niche technology of bidirectional charging widely marketable.

The encouraging news is that Germany’s Federal Minister for Economic Affairs and Climate Protection, Robert Habeck, has recognized the win-win potential of bidirectional charging, paving the way for its broader implementation starting in 2025 (7).

References:

1. IRENA (2021): Majority of New Renewables Undercut Cheapest Fossil Fuel on Cost [online] Majority of New Renewables Undercut Cheapest Fossil Fuel on Cost

2. Transport & Environment (2024): Batteries on wheels: the untapped potential of EVs [online] Batteries on wheels: the untapped potential… | Transport & Environment

3. Rödl & Partner (2022): Bidirectional charging – possibilities, risks and opportunities [online] Bidirectional charging – possibilities, risks and opportunities | Rödl & Partner

4. Frauenhofer ISE & Frauenhofer ISI (2024): Study on the “Potential of a full EV-power-system integration in Europe & how to real [online] Study on the “Potential of a full EV-power-system integration in Europe & how to realise it”, Frauenhofer

5. Tagesschau (2024: Das Elektroauto als Stromspeicher [online] Studie sieht hohes Potenzial von E-Autos als Stromspeicher | tagesschau.de

6. ADAC (2024): Das Elektroauto als Stromspeicher fürs Haus: So funktioniert bidirektionales Laden [online] Bidirektionales Laden: E-Auto wird zum Stromspeicher fürs Haus

7. FAZ (2024): E-Autos als Stromspeicher: Habeck will bidirektionales Laden ab 2025 einführen [online] E-Autos als Stromspeicher: Habeck will bidirektionales Laden ab 2025 einführen

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Author: Student of MBA Sustainability Management Class 2 (2024-2026)