Core Insights - In September 2025, domestic natural gas heavy truck sales reached 23,400 units, a year-on-year increase of nearly 150%, marking the second consecutive month of growth [1][4] - Cumulatively, from January to September 2025, natural gas heavy truck sales totaled 145,700 units, a year-on-year decline of 2%, with a net decrease of approximately 3,000 units compared to the same period last year [1][18] Engine Market Characteristics - In the first three quarters of 2025, the natural gas heavy truck engine market saw significant changes, with a total of 23,400 engines sold in September, representing a 149% year-on-year increase [4][13] - The cumulative sales of natural gas heavy truck engines from January to September 2025 reached 145,700 units, reflecting a 2% year-on-year decline, although the decline rate narrowed by 10 percentage points compared to August [4][18] Engine Displacement and Power Distribution - The main displacement ranges for natural gas heavy truck engines in the first three quarters of 2025 were 12-13L and 14-15L, accounting for 42.97% and 39.92% respectively, while engines over 15L accounted for 3.98% [6] - In terms of power, the primary ranges were 500-600 horsepower and 400-500 horsepower, making up 44.27% and 37.48% respectively, with super high horsepower (≥600 horsepower) models increasing their share by over 13 percentage points compared to the previous year [9][10] Market Share and Rankings - In September 2025, five companies sold over 1,000 engines, with Weichai leading at 12,200 units, holding a market share of 52.17% [15] - Cumulatively, from January to September 2025, Weichai sold 75,600 units, capturing 51.92% of the market, while Cummins and FAW Jiefang followed with 28,700 and 18,300 units respectively [19][22] Sales Trends and Future Outlook - The natural gas heavy truck engine market saw a total of eight companies achieving sales by September 2025, with some companies experiencing significant growth, such as Dongfeng Longqing and Hualing, which saw increases of 177% and 400% respectively [20][22] - The market's strong performance in September raises hopes for a positive year-end conclusion for the natural gas heavy truck and engine markets [27]