Guest post by Steve Letendre, PhD
Why Consider Bidirectional Charging for Fleets?
Fleet electrification is no longer a future concept—it’s here. Transit agencies, school districts, delivery companies, and corporate fleets are all adopting electric vehicles (EVs). The benefits are clear: lower fuel and maintenance costs, cleaner air, and alignment with corporate sustainability goals.
But there’s a new opportunity on the horizon that goes beyond simply replacing gasoline or diesel with electricity: bidirectional charging with vehicle-to-grid (V2G) technology. With V2G, electric vehicles can both draw power from the grid and send it back when needed. This capability transforms parked vehicles into flexible energy assets, capable of lowering energy costs, generating new revenue, and providing backup power in emergencies.
Five Step V2G Fleet Assessment
The V2G opportunity for fleets is promising, but not every fleet will be ready to capture it. Making the leap to bidirectional charging requires a thoughtful evaluation of operational needs, infrastructure, and economics. Below are five steps that every fleet operator should take before committing to bidirectional charging.
Step 1. Evaluate Revenue-Generating Opportunities
The first and most important question is: what value streams are available in your service territory? Bidirectional charging only makes sense where opportunities exist to leverage V2G technology to create tangible benefits for the fleet owner.
There are four primary ways V2G can deliver value:
Behind-the-meter savings
Many commercial electricity rates include a demand charge, which is applied to the highest level of energy use during a billing cycle. For fleets that share electricity infrastructure with offices, warehouses, or manufacturing facilities, this can be a major cost driver. V2G-equipped vehicles can discharge power back into the facility during periods of high demand, reducing those charges and lowering overall energy costs. This is the same economic principle behind stationary battery storage projects today—only here, the “batteries” are your vehicles.
Resiliency value
For fleet depots where downtime is costly or unacceptable, the ability to use parked vehicles as a source of backup power can be invaluable. Imagine a storm that knocks out grid service: instead of halting operations, a fleet could use stored energy from its vehicles to keep critical systems running until service is restored.
Assigning a dollar value to resiliency, however, is not straightforward. The benefits depend heavily on the specific needs of the facility and the costs associated with losing service for a given period of time. For a logistics hub, even a few hours without power could mean lost deliveries and unhappy customers. For a transit agency, outages could disrupt schedules and strand passengers. In these cases, V2G provides an insurance-like value—difficult to quantify, but potentially critical to maintaining reliable operations.
Utility demand response programs
Increasingly, utilities offer payments to customers who reduce load or inject power into the grid during times of peak demand. EV fleets, with proper controls, are well-suited to participate. These programs can generate steady revenue with relatively low operational impact.
There are already strong examples on the ground: in Massachusetts, fleets can enroll bidirectional vehicles in the Connected Solutions program, which compensates customers for discharging during summer peaks. In California, Pacific Gas and Electric (PG&E) has enabled V2G school bus fleets to participate in the Emergency Load Reduction Program, rewarding customers for supplying energy during extreme system stress.
Wholesale market participation
In some regions, EV fleets can be aggregated to participate in wholesale electricity markets—supplying capacity, frequency regulation, or other ancillary services. While this looks like one of the most attractive applications on paper, in practice, participation is still limited. Market rules in many areas are evolving slowly under FERC Order 2222, and opportunities often focus on load reductions (shifting or curtailing charging) rather than actual exports back to the grid.
For now, wholesale participation requires an aggregator to pool vehicles and manage compliance with market rules, which adds cost and complexity. Still, the long-term promise is real. As rules mature and the need for flexible resources grows, wholesale markets could offer a meaningful income stream for fleets with V2G capability—especially in regions with high renewable penetration and increasing grid variability.
The lesson: the V2G business case is highly dependent on local program and market conditions. A fleet in one utility territory may find ample opportunities, while a similar fleet elsewhere may find none. Doing your homework up front is essential.
Step 2. Analyze Fleet Duty Cycle Alignment
Even when attractive programs exist, V2G only delivers value if vehicles are available at the right times and with sufficient state of charge (SOC). The key question: are vehicles parked and plugged in when energy services are most valuable—whether that is reducing facility demand charges, providing resilience to critical operations, or supporting the grid during peak demand?
Well-suited fleets include school buses, which have predictable downtime during the day and extended overnight parking windows. Other promising applications include certain delivery or service fleets with regular idle periods, such as refuse hauling or morning delivery routes.
More challenging fleets include those with high daily mileage and little downtime, where vehicles are rarely stationary long enough to contribute meaningful energy services.
Ultimately, aligning fleet duty cycles with periods of highest energy value—whether behind the meter or on the grid—is one of the most critical determinants of V2G success.
Step 3. Assess Charging Infrastructure Requirements
Most V2G-capable chargers available today are high-power DC fast chargers, which come at a premium compared to standard Level 2 units. For fleets that don’t require fast charging, this added expense may be difficult to justify. However, when higher charging speeds are needed, the incremental cost of choosing a bidirectional charger over a unidirectional one is relatively modest—and positions the fleet to capture additional value streams.
In addition to charger costs, utilities may require infrastructure upgrades—such as larger transformers, protective relays, or interconnection equipment—to safely support energy export. These costs can be significant, making it critical to consult with your utility early in the planning process to identify requirements and avoid surprises.
A practical approach is to build a portfolio of charging infrastructure rather than a one-size-fits-all solution. For example, a fleet may combine a baseline of unidirectional Level 2 chargers with a smaller number of bidirectional DC fast chargers. This approach provides flexibility, mitigates risk, and creates a pathway for learning while positioning the fleet for future V2G opportunities as technology and market rules mature. By phasing in bidirectional chargers, fleets can balance today’s operational needs with tomorrow’s revenue potential.
Step 4. Consider Vehicle Readiness
Not all electric vehicles on the market today support bidirectional charging. While several school bus manufacturers and a handful of light-duty OEMs have introduced V2G-enabled models, overall market coverage is still limited.
A key first step is to assess your existing fleet: which vehicles are currently electric, which may be replaced or added in the near term, and whether bidirectional-capable options are available in those segments. For many fleets, upcoming procurement cycles present an opportunity to align vehicle investments with V2G capability.
It is equally important to review manufacturer roadmaps. Many automakers are actively signaling plans to enable bidirectional functionality in future models. Tracking these developments ensures that procurement strategies are forward-looking and position the fleet to capture value as capabilities expand. By aligning fleet planning with technology availability, organizations can future-proof their operations and be ready to participate in V2G opportunities as the market matures.
5. Forecast Economics and Warranty Considerations
The final step is to carefully weigh the economics of V2G. While the potential benefits are significant, V2G comes with added costs that extend beyond chargers and controls. These include interconnection fees, utility-required upgrades (such as transformers or protective relays), site electrical work, and ongoing operations and maintenance. All of these should be factored into a comprehensive cost-benefit analysis.
A robust evaluation should include:
- Expected revenues and savings under different participation scenarios (e.g., demand charge management, demand response, capacity programs, resilience value).
- Sensitivity testing around uncertain assumptions, such as future market payments, program enrollment levels, or technology performance.
- Battery considerations, including manufacturer warranty terms and assumptions about battery degradation. Some OEMs explicitly support V2G within warranty conditions, while others may exclude it. If degradation is minimal, the economics improve substantially; if higher, the case may be weaker.
- Infrastructure and interconnection costs can vary widely depending on site conditions and utility requirements. Early engagement with your utility is critical to understanding and managing these costs.
Taking all these factors together, fleets should compare the net value of different charging infrastructure strategies—including mixed portfolios of unidirectional and bidirectional chargers—to determine whether V2G delivers positive returns under realistic assumptions.
Conclusion: Start with a Pilot
Vehicle-to-grid (V2G) technology has the potential to transform fleet operations—lowering costs, generating new revenue, and strengthening resiliency. But these benefits are highly context-specific, depending on your fleet’s duty cycle, vehicle readiness, local utility programs, and the economics of participation.
For most operators, the best path forward is to start with a pilot project. A limited deployment allows you to validate assumptions, test systems, and build internal expertise before making larger commitments. This approach not only reduces risk, but also positions your organization to integrate lessons learned into long-term fleet planning.
Importantly, V2G can be a powerful accelerator for corporate transportation electrification journeys. By stacking additional value streams on top of traditional electrification benefits, V2G helps make the business case stronger, reduces payback periods, and demonstrates leadership in innovation and sustainability. Integrating V2G into your electrification roadmap ensures your organization captures the full potential of EV adoption—operational, financial, and reputational.
Steve Letendre, PhD, is an energy economist and policy strategist with over 25 years of experience advancing distributed energy and electric vehicle integration. He is the founder of V2G News, a platform focused on bidirectional charging and V2G technology, and serves as Vice Chair of the Vehicle Grid Integration Council (VGIC), the leading industry association on vehicle-grid integration. Contact Steve at [email protected].
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