Bidirectional Charging and V2G: The Future of Building Energy

Most EV chargers do one thing: send electricity from the building into the car. Bidirectional charging adds a second direction, letting energy flow back out of the car's battery when it is needed elsewhere. Think of a parked electric vehicle not just as a car that needs power, but as a large battery on wheels that can give power back.

You will see three related terms. Vehicle-to-grid (V2G) means the car sends power back to the utility grid, usually in exchange for payment. Vehicle-to-home (V2H) means the car powers a building during an outage or during expensive peak hours. Vehicle-to-load (V2L) is the simplest version, where the car acts like a portable generator with standard outlets. For multifamily properties, V2G and V2H are the two worth understanding.

The key idea for a board is this: a typical EV battery holds 60 to 130 kilowatt-hours of energy. That is roughly two to four days of electricity for an average home. A handful of resident vehicles parked in your garage represent a meaningful pool of stored energy that, with the right equipment, could be put to work for the building.

The most immediate benefit is managing demand charges. Many buildings on commercial electric rates pay not just for the energy they use, but a separate fee based on their single highest 15-minute spike of demand each month. These demand charges can run 10 to 25 dollars per kilowatt and often make up 30 to 50 percent of a building's electric bill. A coordinated fleet of bidirectional vehicles can discharge during those peak moments to shave the spike and lower that fee.

The second benefit is resilience. During a grid outage, a V2H-capable setup can keep critical building systems running such as elevators, hallway lighting, security gates, and water pumps, without the cost and maintenance of a diesel generator. Ford markets exactly this capability with its Intelligent Backup Power feature on the F-150 Lightning, which can power a home for up to three days.

There is also a revenue angle. In V2G programs, the utility or a third-party operator pays the vehicle owner for the grid services the battery provides. Today most of those payments flow to the car owner, but boards that own building batteries or that negotiate shared arrangements can capture part of that value. It is early, but the direction is clear.

Bidirectional charging is not yet plug-and-play. Three pieces all have to line up: a compatible vehicle, a bidirectional charger, and software that coordinates everything safely. As of 2026, only a limited set of vehicles support it, including the Ford F-150 Lightning, several Hyundai and Kia models built on the E-GMP platform, the Nissan Leaf, and the GM lineup through GM Energy. More models are arriving each year.

The chargers themselves are more expensive than ordinary ones. A standard networked Level 2 charger runs roughly 1,500 to 3,000 dollars per port, while a bidirectional unit such as the Wallbox Quasar 2 or comparable DC bidirectional equipment can run 6,000 to 12,000 dollars or more per port installed. The price gap is narrowing but remains real today.

The standards picture is improving, which is what makes future-proofing possible. ISO 15118-20, the communication standard that enables secure bidirectional charging and Plug and Charge, is now being built into new equipment. SAE J3068 and the newer combined-charging approaches address the power side. When a board buys equipment, asking whether it supports ISO 15118-20 is the single most useful question for keeping options open.

This is no longer just theory. In California, utilities including PG&E have run vehicle-to-everything pilots, and a state law signed in 2023 (Senate Bill 233) directs regulators to push toward making bidirectional capability standard on EVs over time. Fermata Energy, an early V2G company, operates commercial pilots where fleet vehicles earn money by feeding power back during grid stress events.

On the automaker side, GM Energy now sells a home system that pairs its EVs with bidirectional hardware, and Ford's Intelligent Backup Power has been deployed at scale with the F-150 Lightning. School-bus electrification programs have become a leading proving ground, because buses sit idle and fully charged during exactly the summer afternoon hours when grids are most strained.

For multifamily properties specifically, most activity is still in the pilot and demonstration phase rather than routine deployment. That is normal for a technology at this stage. The practical takeaway is that the building blocks are real and improving, but a board should treat full V2G as a planning horizon of the next three to five years, not a purchase to make this quarter.

You do not need to buy bidirectional chargers today to benefit from this trend. The smartest move is to make your current EV charging project future-ready so you are not forced into an expensive rip-and-replace later. That mostly comes down to a few low-cost decisions made during your standard installation.

When you install ordinary Level 2 chargers now, oversize the electrical infrastructure slightly, run conduit and wiring capacity for more power than you need today, and choose networked equipment that supports modern standards. These steps add a modest amount to upfront cost but can save tens of thousands of dollars when you expand or upgrade. They are the same future-proofing principles that apply to any EV charging build-out.

Finally, ask your installer and utility the right questions. Find out whether your utility offers any V2G or demand-response pilots, whether your local rate structure includes demand charges that bidirectional charging could reduce, and whether the hardware you are considering supports ISO 15118-20. Document the answers for future boards so the institutional knowledge does not walk out the door at the next election.

Bidirectional charging turns resident vehicles into flexible energy assets that can lower demand charges, provide backup power during outages, and eventually generate revenue through grid services. The technology is genuinely promising and the standards needed to support it are arriving now.

For HOA boards and property managers, the honest assessment is that V2G is a near-future opportunity rather than an off-the-shelf product for most properties in 2026. The cost premium on hardware is still significant and vehicle compatibility is limited, so a board that rushes in today is likely overpaying for capability it cannot fully use yet.

The right posture is informed patience. Build your charging infrastructure to be upgrade-ready, keep an eye on your utility's pilot programs, and revisit the decision every year or two as costs fall and more vehicles arrive. Boards that lay the groundwork now will be able to add bidirectional capability cheaply and quickly when the economics tip, while those that ignore it may face a costly retrofit.