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Electric trucks: Reliable on the road and profitable as energy storage
Electric trucks could help freight carriers reduce energy costs and ease financial pressures: Their batteries can also serve as energy storage for the depot or the public grid. As the SPIRIT-E research project comes to a close, a consortium led by the Technical University of Munich (TUM) demonstrates how the vehicles can be integrated into the energy system and what conditions must be met for their economically viable operation.
In a test environment, the project partners simulated how the vehicles could charge when electricity prices are low and sell electricity back when prices are higher. This could provide freight carriers with an additional source of revenue in the future.
To make this possible, the consortium developed and tested the necessary interfaces between trucks, charging stations, energy management systems, electricity marketers, and grid operators, including a reservation system for charging stations.
Electric trucks supply buildings and other vehicles with electricity...The researchers tested the underlying technology at a freight forwarding company in Regensburg. They used an electric truck with a usable battery capacity of 480 kilowatt-hours. Using a bidirectional DC charging station, the truck fed electricity back at a power output of up to 350 kilowatts.
Three applications were tested: The truck supplied electricity to other vehicles (vehicle-to-vehicle), supported the power supply at the company’s premises (vehicle-to-site), and fed electricity into the public grid (vehicle-to-grid). Communication between the vehicle and the charging infrastructure was based on the international standard ISO 15118-20.
Accompanying research: Reliability first, then economic viability...In addition to the joint project results, the TUM Chair of Automotive Technology conducted accompanying research to determine whether and how freight carriers can reliably operate electric fleets and how the transition can be made economically viable. The research drew, among other sources, on real-world driving data from six German heavy-duty vehicle fleets covering a total of 2.15 million recorded kilometers. The key findings:
-Reserving charging points: If electric trucks can reserve public charging points in advance on long-haul routes, planning reliability improves. Depending on the scenario, the median additional time required compared with diesel trucks falls to around 1 to 4 percent.
-Plan the fleet and depot together: With dedicated charging infrastructure at the depot, a significantly larger share of the fleet can be reliably operated on electricity than with public charging alone. Companies that also include solar power and battery storage in their planning can save 25 to 44 percent more than by converting the trucks alone.
-Rethinking dispatch planning: If route planning takes charging flexibility into account, charging can be deliberately scheduled for periods when electricity is less expensive. Depending on the mix of transportation orders, this reduces the fleet’s total costs.
-Integrate the depot intelligently into the energy system: Smart integration with the power grid and electricity market reduced the total costs of the fleets studied by an average of 1.7 cents per kilometer. With bidirectional charging, the reduction reached 6.1 cents per kilometer.
How freight carriers can reduce their electricity costs...Using the stored electricity at the depot is particularly promising. For example, electric trucks can charge using surplus electricity from a photovoltaic system during the day and supply that electricity again later. This can increase the amount of a company’s electricity demand that it meets from its own generation. The vehicles can also cover short-term spikes in electricity demand, helping to avoid costly peak loads.
The project team estimates that this could reduce energy costs by around 10 percent. For a truck traveling 100,000 kilometers a year, that is equivalent to the energy cost of driving 10,000 kilometers. How much a freight carrier can save depends primarily on annual mileage, vehicle downtime, and electricity prices. Vehicles used for regional transportation and returning regularly to the depot are particularly well suited to this approach.
Challenges to implementation...The project results show that the biggest hurdles now lie less in technical implementation than in grid integration and the economic framework. At many depots, for example, the existing grid connection capacity is insufficient to charge larger fleets of electric trucks. Flexible grid connection agreements, battery storage, or shared charging infrastructure can help overcome these constraints.
There are also currently no uniform standards for marketing the electricity stored in truck batteries. Many providers use proprietary technical solutions that are incompatible with one another. It also remains to be determined how responsibilities and revenues should be divided among freight carriers, vehicle manufacturers, and electricity marketers.
“SPIRIT-E has shown that heavy-duty electric trucks can be much more than just new electricity consumers. Technically, they can be integrated into the energy system as flexible storage systems. The task now is to standardize and scale the solutions that have been tested and turn them into viable business models. This will require researchers, grid operators, industry, the logistics sector, and policymakers to work together,” says Prof. Markus Lienkamp, holder of the Chair of Automotive Technology at the TUM School of Engineering and Design.
The phrase "reliable on the road and profitable as energy storage" captures a major breakthrough in commercial logistics and energy management demonstrated by the SPIRIT-E research project.
Led by the [Technical University of Munich (TUM)] "Electric trucks: Reliable on the road and profitable as energy storage" TUM) in collaboration with industry giants like MAN Truck & Bus, Shell (SBRS), and Fraunhofer IEE, the consortium proved that heavy-duty electric trucks can double as mobile, virtual power plants. Rather than acting as a strain on the electrical grid, idling fleet vehicles can actively generate secondary revenue streams.
The core technology & setup...The project moved beyond pure simulation, executing real-world testing at a freight depot in Regensburg, Germany, with a concrete setup:
• The vehicle: A heavy-duty electric truck equipped with a 480 kWh battery capacity.
• The infrastructure: A high-powered, bidirectional DC charging station delivering an output of up to 350 kW.
• The software: Standardized communications utilizing ISO 15118-20 protocol paired with smart energy management and reservation systems to dynamically sync trucks, grid operators, and electricity marketers.
The three operational use cases...The trial successfully validated three primary bidirectional charging paths, proving that vehicles can reliably return power depending on commercial and grid needs:
1. Vehicle-to-Vehicle (V2V): Directly supplying power from an idle truck's battery to charge another logistics vehicle on-site.
2. Vehicle-to-Site (V2S): Powering the freight depot's buildings and facilities. This allows companies to store low-cost midday solar energy in their trucks and discharge it later to completely avoid expensive grid peak-load fees.
3. Vehicle-to-Grid (V2G): Feeding electricity directly back into the public grid during peak demand windows when power prices surge.
Financial gains: The 10% rule...Smart battery utilization translates directly into massive operation savings for freight carriers:
• 10% energy cost cut: Integrating smart grid arbitrage and peak-shaving lowers overall fleet electricity costs by an estimated 10%.
• The mileage equivalent: For a standard commercial truck averaging 100,000 kilometers a year, a 10% cost reduction essentially equates to saving enough energy to fund 10,000 kilometers of entirely free driving.
The prime candidates for this model are regional distribution fleets that return reliably to a central depot overnight or during fixed shifting breaks, providing highly predictable windows for energy trading.
This dual benefit describes Electric Vehicles (EVs) powered by advanced battery technology (specifically when integrated with Vehicle-to-Grid, or V2G, technology).
Here is why they are both reliable on the road and highly profitable as energy storage units:
1. Why they are reliable on the road...EVs have proven to be exceptionally dependable for daily transport due to their simplified engineering:
• Fewer moving parts: Unlike internal combustion engines with thousands of moving components, electric drivetrains have very few. There are no spark plugs, pistons, valves, or exhaust systems to fail.
• Low maintenance: They eliminate the need for oil changes, fuel filters, or timing belt replacements, significantly reducing the likelihood of mechanical breakdowns.
• Instant performance: Electric motors deliver immediate torque and smooth acceleration, providing consistent performance in various driving conditions.
• Regenerative braking: This system uses the motor to slow the vehicle, saving energy while dramatically reducing wear and tear on the physical brakes.
2. Why they are profitable as energy storage...When parked, an EV is essentially a giant, mobile lithium-ion battery. Through Vehicle-to-Grid (V2G) and smart charging technologies, owners can turn this idle asset into a revenue stream:
• Arbitrage (Buy Low, Sell High): You can program the vehicle to charge at night when electricity demand and prices are at their lowest. During peak afternoon hours—when electricity prices spike—you can sell that stored power back to the utility grid at a premium.
• Grid stabilization services: Utility companies pay EV owners to keep their cars plugged in to help balance the grid. Your battery can quickly absorb excess renewable energy (like solar surges at noon) or discharge power during brief grid shortages, earning you passive income.
• Home backup power (V2H): Instead of selling to the grid, the battery can power your home during peak hours or blackouts. This lowers your monthly utility bill by avoiding expensive peak-rate electricity.
Electric trucks can reduce freight energy costs by around 10% when used as mobile energy storage for depots and the public grid.
Key findings from the SPIRIT-E Project:
• Consortium leadership: A project led by the Technical University of Munich (TUM) demonstrated how electric truck fleets integrate into power grids.
• Battery & power specifications: Tested using an electric truck with a 480 kWh usable battery capacity and a bidirectional DC charging station delivering up to 350 kW of power output.
• Communication standard: Utilized ISO 15118-20 for vehicle-to-grid communication.
Tested applications:
• Vehicle-to-Vehicle (V2V): Supplying electricity directly to other utility or transport vehicles.
• Vehicle-to-Site (V2S): Supporting facility power demands at company premises, covering short-term spikes and avoiding costly peak loads.
• Vehicle-to-Grid (V2G): Feeding stored energy back into the public electricity grid when market prices are high.
Economic impact:
• Cost reduction: Smart energy use can cut a freight carrier's total energy costs by roughly 10%.
• Optimization factors: Financial viability depends heavily on annual mileage, vehicle downtime at the depot, and regional electricity price fluctuations. Regional transport trucks returning regularly to base yield the highest returns
Technical University of Munich (TUM)














