新能源汽车化身“移动充电宝”，车网互动普及仍需多方发力

Core Viewpoint - The article discusses the emerging trend of Vehicle-to-Grid (V2G) technology, highlighting its potential to transform electric vehicles into "mobile power banks" that can charge during off-peak hours and discharge back to the grid during peak times, thus providing economic benefits and aiding in grid stability [1][5]. Group 1: V2G Technology Implementation - The city of Hefei has established a demonstration site with 27 V2G charging stations, allowing electric vehicle owners to automatically discharge power back to the grid, potentially earning up to 40 yuan per discharge based on current pricing differentials [2][3]. - Hefei has conducted successful tests of V2G technology, achieving a discharge power exceeding 2000 kW and a total discharge volume of over 5000 kWh, equivalent to three years of electricity consumption for an average household [3]. - Other cities, including Shenzhen and Guangzhou, are also exploring V2G implementation, with various pilot projects underway to test the technology's scalability [4]. Group 2: Market and Policy Drivers - The total charging volume for electric vehicles in China reached 54.923 billion kWh in the first half of the year, with projections indicating that the annual charging volume will be comparable to the annual output of the Three Gorges Dam [5]. - Recent government policies have introduced financial incentives for V2G technology, such as subsidies for the installation of V2G facilities and rewards for energy discharged back to the grid [8]. - The ongoing development of the electric power market and the improvement of energy trading mechanisms are expected to facilitate the profitability of V2G systems [7]. Group 3: Challenges and Bottlenecks - Despite the favorable conditions for V2G technology, challenges remain, including high costs of V2G equipment, which can be 2.5 times more expensive than standard chargers, and the lack of unified technical standards across manufacturers [10][11]. - Concerns from automakers regarding the impact of V2G functionality on vehicle sales and potential liability issues during discharge events are hindering broader adoption [12]. - At the consumer level, there are apprehensions about the wear and tear on vehicle batteries from frequent charging and discharging, which may deter participation in V2G programs [13].