A Practical Model for V2G Technology
A project in the US state of California has proven that integrating electric school buses into the national power grid is not just a theoretical idea, but a tangible technological reality. Over the past two years, a fleet of 74 school buses, operated by Zum and utilizing chargers manufactured by Tellus Power, managed to supply power to approximately 1,000 homes during peak times, significantly easing the pressure on the electrical grid.
How Does the System Work?
This experiment relies on Vehicle-to-Grid (V2G) technology, which allows electric vehicles not only to receive energy, but also to pump it back into the grid. The mentioned buses possess a total storage capacity of up to 11.5 megawatt-hours. The mechanism operates as follows:
- Charging: The buses are charged at night when electricity costs are low.
- Daily Consumption: The buses consume between 20% to 40% of their energy during student transport trips.
- Smart Discharging: After the school day ends, the buses are connected to bidirectional chargers to pump energy into the grid during peak hours (the afternoon period), when household demand for air conditioning and cooking increases.
Why Does This News Matter?
The significance of this project lies in providing a solution to the problem of electrical grid stability without the need to build expensive traditional power plants. According to recorded data, the fleet successfully returned 1.7 gigawatt-hours of energy to the grid over two years, with an uptime reliability exceeding 99.5%. This performance effectively transformed the fleet into a small and reliable "peaker power plant," enabling operators to achieve financial returns through energy arbitrage—buying electricity cheaply and selling it when the need for it is at its peak.
Technical Advantages and Future Expansions
The Tellus Power chargers used in this project do not require massive on-site transformers, which reduces installation costs and accelerates the deployment process compared to traditional power plants that may take years to build. The company plans to expand this model to include other municipal vehicles, such as electric garbage trucks, which have operational cycles similar to school buses, opening new horizons to enhance energy efficiency in cities.