Core Viewpoint - The domestic natural gas heavy truck market has experienced a continuous decline, with July sales dropping by 22% year-on-year, leading to a cumulative sales decrease of 17% for the first seven months of 2025 compared to the previous year [1][2][15]. Sales Performance - In July 2025, the sales of natural gas heavy truck engines reached 14,000 units, a year-on-year decrease of 22%, resulting in a total of 105,500 units sold from January to July, which is a 17% decline compared to the same period last year [2][10][15]. - The cumulative sales decline from January to July 2025 is approximately 21,200 units compared to the previous year [15]. Engine Displacement Analysis - The main displacement ranges for natural gas heavy truck engines from January to July 2025 are 12-13L and 14-15L, accounting for 42.41% and 40.02% of the market, respectively. The share of engines over 15L has increased to 3.76% [4][5]. - The proportion of engines in the 12-13L and 14-15L categories has decreased compared to the previous year, while the share of larger displacement engines has risen [4]. Power Segment Insights - The primary power ranges for natural gas heavy truck engines from January to July 2025 are 400-500 horsepower and 500-600 horsepower, making up 37.19% and 45.26% of the market, respectively. The share of super high horsepower (≥600 horsepower) engines has increased to 15.08% [8]. - The share of super high horsepower models has risen by over 13 percentage points compared to the previous year, while the shares of the 400-500 horsepower and 500-600 horsepower segments have decreased [8]. Market Share and Competitors - In July 2025, five companies sold over 1,000 units of natural gas heavy truck engines, with Weichai leading with 6,911 units, holding a market share of 49.31% [12][19]. - Cumulative sales from January to July 2025 show Weichai with 54,400 units sold, capturing over 50% of the market share, followed by Cummins with 21,000 units (19.92% market share) and Jiefang with 13,900 units (13.15% market share) [19]. Company Performance - Among the eight companies in the natural gas heavy truck engine market, four have seen sales growth, with Yuchai, Dongfeng Longqing, Heavy Truck, and Hualing showing increases of 49%, 160%, 2%, and 400%, respectively [16]. - The companies with declining sales have experienced significant drops, with the worst performer seeing a 46% decrease in cumulative sales from January to July 2025 [16]. Conclusion - The natural gas heavy truck engine market has faced a significant downturn, with a cumulative sales drop of 17% as of July 2025. The market is characterized by a limited number of participants, with only eight companies currently active [23].