V2G Calculator — How Much Could Your Electric Vehicle Earn?

The Battery Revolution Hiding in Your Driveway

Renewable energy is clean, increasingly cheap, and scaling fast. But it has one fundamental weakness: it generates power on nature's schedule, not ours. The sun doesn't shine at 8pm when you get home and turn everything on. The wind doesn't blow on command during a heatwave.

Fossil fuels don't have this problem — you want more power, you burn more gas. It's dirty, but it's on demand. So the question that has defined the energy transition is: how do we make clean energy available when we actually need it?

The answer is closer than most people think — and a big part of it is probably sitting in your driveway.

Too Much Energy Is a Real Problem

Here's something that surprises most people: in many places, we don't have too little renewable energy. We have too much — at the wrong time.

Take Australia. There's so much rooftop solar installed now that during the middle of the day, when the sun is blazing, supply massively exceeds demand. The wholesale electricity price drops to zero. And sometimes it actually goes negative.

How does electricity cost less than nothing? Large coal and gas generators can't just switch off quickly. Ramping down and restarting is expensive and damaging to their equipment. So when renewables are flooding the grid, these big generators will actually pay people to take their electricity rather than shut down.

This isn't just an Australian quirk. When the wind is howling in the North Atlantic, wind power drives down electricity prices across northern Europe. As more renewables get deployed globally, oversupply events are becoming more and more common.

Then Comes the Evening Spike

On the other side of the equation, we get massive demand spikes — in the evening when there's no solar, or during heatwaves when everyone turns on their air conditioning at the same time.

We build our entire power infrastructure to handle these peaks — even though they might only happen for a few hours a year. We maintain power plants that sit idle most of the time, just in case. It's enormously wasteful and expensive.

So the real question is simple: how do we take that oversupply — that cheap, free, or even negatively-priced energy — and move it to the times when we actually need it?

The World's Largest Battery Network Is Already Being Built

The answer is batteries. And here's the exciting part: we're already building a massive distributed battery network. We're just not using it yet.

Every electric vehicle that rolls off a production line has a huge battery in it. The average EV battery stores 50 to 80 kilowatt hours of energy. The average household uses about 15 to 25 kilowatt hours per day.

That means a single EV battery can power an average home for 2 to 4 days.

And EV adoption is accelerating fast:

• 2015: EVs were less than 1% of global vehicle sales
• 2024: EVs reached approximately 20% of global sales
• 2025: Reached approximately 24% of sales (22+ million vehicles)
• 2030: Forecasted to reach 42% of global sales (40+ million vehicles)
• 2040: Projections suggest up to 73 million units sold annually

As of 2025, China led with EVs reaching approximately 51% of sales. Europe targets 60% by 2030. The momentum is undeniable.

Now here's the stat that makes it all click: cars sit idle 95% of the time. The average car is driven about one hour per day and parked for the other twenty-three. That's hundreds of millions of large batteries, sitting in driveways and garages, connected to the very buildings that consume electricity — doing nothing, nearly all of the time.

Vehicle-to-Grid: Turning Parked Cars into Power Stations

Vehicle-to-Grid (V2G) is the technology that lets power flow both ways — not just from the grid into your car, but from your car back into the grid. It turns every parked EV into a small, distributed power station.

Soaking Up the Oversupply

When solar generation peaks during midday or wind farms produce excess power, EVs can absorb that surplus. Instead of wasting renewable energy or letting it drive prices negative, we store it in millions of batteries that are just sitting in garages anyway.

Feeding the Grid When It's Needed Most

When demand surges on a hot summer evening or during a winter cold snap, those same EVs can discharge power back to the grid. Instead of firing up expensive, polluting peaker plants, we draw on clean, stored energy.

During evening peak hours (6-9pm), V2G-enabled EVs discharge stored energy, flattening demand spikes and reducing the need for expensive peaker plants.

Your Car Won't Run Out of Charge

The most common concern: won't the car need that energy? Yes — and V2G is designed around that. This doesn't mean draining your car every day. It's smart and occasional.

V2G activates primarily during rare high-demand events — a heatwave, a grid emergency, a peak pricing spike. Perhaps two or three times a month. The rest of the time, your EV charges normally, ideally soaking up cheap daytime solar or overnight off-peak power.

This occasional use means minimal impact on battery life, while providing enormous value — to the grid, and potentially to your wallet.

Virtual Power Plants: When Thousands of Batteries Act as One

One EV feeding energy back to the grid won't make much difference on its own. Neither will one home battery. But when you connect thousands — or hundreds of thousands — of these small batteries together and coordinate them, they act as a single, large power source. That's a Virtual Power Plant (VPP).

A VPP doesn't have a smokestack or a turbine. It's software. It aggregates distributed batteries — in homes, in cars, in businesses — and deploys them together. When the grid needs power, the VPP signals thousands of batteries to discharge a little bit each. When there's oversupply, it signals them to charge up.

The result is a power plant that doesn't just generate energy — it absorbs it too. It smooths out the peaks and fills in the troughs, using assets that already exist.

Oversupply Becomes an Opportunity

This is what turns the intermittency problem on its head. That zero-cost or negative-cost electricity during the day? That's now cheap fuel for your battery.

Your home battery or EV charges up when energy is practically free, and you use or sell that energy when it's worth the most. It improves the economics of owning a home battery. It improves the economics of owning an EV. And it makes the whole grid cleaner, cheaper and more resilient.

This Is Already Happening

V2G isn't a concept for the distant future. Pilot programs are running in multiple countries right now, proving the technology works and the economics stack up.

Amber Electric in Australia (as of mid-2025) is installing V2G chargers in residential homes as part of a $3.2 million ARENA-funded trial. With BYD agreeing to honour warranties for V2G participants, Amber is demonstrating how EVs can serve as "batteries on wheels" — charging during low-demand periods and discharging during peak times. The program plans to expand to 1,000 customers across multiple states, with commercial launch planned for 2026.

In Europe, Utrecht in the Netherlands (as of early 2025) has become the first city to implement large-scale V2G car-sharing. The "Utrecht Energized" initiative launched with 50 Renault 5 E-Tech vehicles equipped with bidirectional chargers, stabilising the grid by charging during solar peaks and discharging during demand spikes — with plans to expand to 500 EVs.

In the United States (as of 2025), Sunrun has launched vehicle-to-home programs using Ford F-150 Lightning trucks, while Fermata Energy has deployed V2G solutions with fleet vehicles, generating revenue through grid frequency regulation services.

Not every EV supports V2G yet, and you need a bidirectional charger. But the direction is clear, the technology works, and it's accelerating. The question isn't whether this will happen — it's how quickly it scales.