Overview
Academician Ouyang Minggao has argued for treating the country’s projected 100 million electric vehicles as distributed “power banks” for the grid, estimating that vehicle-to-grid (V2G) discharge capacity could reach 50 GW by 2030. The statement crystallises a policy window in which EVs are reframed from passive loads into a flexible, dispatchable storage resource central to renewables integration.
Background & Interpretation
1. Industry Context & Policy Landscape
V2G—encompassing V2H, V2B and V2L—lets bidirectional chargers push energy from vehicle batteries back to the grid or a building. With renewable shares rising, system flexibility is scarce and valuable; aggregating millions of vehicle batteries offers gigawatt-scale, geographically distributed storage at near-zero additional hardware cost (the batteries already exist). Pilot programmes in several cities are testing time-of-use tariffs, ancillary-service participation, and virtual-power-plant aggregation that pays owners for discharged energy.
2. Core Drivers & Underlying Mechanisms
The 50 GW figure derives from simple arithmetic: 100 million EVs at an average usable capacity of roughly 50–60 kWh, if only a fraction are plugged in and dispatchable at peak, yields tens of gigawatts of aggregate power. Technically, V2G requires ISO 15118 / GB/T bidirectional signalling, smart charging management, and grid-synchronised inverters. The central trade-off is battery degradation versus revenue: controlled, shallow, infrequent discharges can be net-positive for owners once compensation exceeds wear, especially when paired with smart scheduling that charges on surplus renewables.
3. Value Chain & Competitive Impact
V2G reshapes the charging value chain toward intelligent energy-management platforms and aggregators that bundle vehicles into market-facing virtual power plants. Utilities gain deferred grid investment; automakers that embed bidirectional capability and favourable warranty terms gain a new selling point. The bottleneck is less technology than market design: electricity markets must allow small aggregators to bid into frequency and peak-shaving markets, and standards must guarantee interoperability.
Implications & Outlook
If market access and warranties align, V2G could become the largest low-cost flexibility source for the new power system. The 2030 target is plausible but contingent on tariff reform and owner incentives.
Takeaways for Industry Participants
- Charging operators should build aggregator capabilities now to capture future VPP revenue.
- Automakers should clarify bidirectional warranties to remove the owner adoption barrier.
- Utilities and regulators must open ancillary markets to distributed, aggregated resources.
- EV owners should evaluate V2G readiness when choosing chargers and tariffs.
This column compiles industry information and shares technical perspectives; it does not constitute investment advice.