Core Viewpoint - The domestic natural gas heavy truck market is experiencing a decline, with sales dropping for four consecutive months, indicating a challenging environment for the industry [1][25]. Sales Performance - In June 2025, domestic natural gas heavy truck sales reached 13,500 units, a year-on-year decrease of 17% [1][13]. - Cumulatively, from January to June 2025, sales totaled 91,500 units, down 16% compared to the same period last year, representing a net decrease of 17,300 units [1][16]. Engine Market Characteristics - The main displacement ranges for natural gas heavy truck engines in the first half of 2025 were 12-13L and 14-15L, accounting for 42.18% and 40.30% of the market, respectively [6]. - The share of engines over 15L has increased, while the shares of 12-13L and 14-15L engines have decreased compared to the previous year [6]. Power Segment Analysis - The primary power ranges for natural gas heavy truck engines in the first half of 2025 were 400-500 horsepower and 500-600 horsepower, comprising 37.12% and 45.67% of the market, respectively [9]. - The share of super high-power (≥600 horsepower) models has increased by over 12 percentage points compared to the same period last year [10]. Market Share and Rankings - In June 2025, five companies sold over 1,000 units of natural gas heavy truck engines, with Weichai leading at 6,611 units and a market share of 49.13% [15]. - Cumulatively, from January to June 2025, Weichai held a market share of 51.85%, followed by Cummins with 19.83% and Jiefang with 13.21% [20]. Top Selling Engine Models - The top-selling natural gas heavy truck engines from January to June 2025 included: - WP13NG480E61 (Weichai) with 23,200 units sold, 25.35% market share, 12.51L displacement, and 480 horsepower [22]. - DG ! 13 T520-60 (Dongfeng Commercial Vehicle) with 5,600 units sold, 6.12% market share, 12.9L displacement, and 520 horsepower [22]. Future Outlook - The natural gas heavy truck engine market has seen a cumulative decline of 16% as of June, raising questions about potential recovery in the remaining months of 2025 [25]. - The market currently has limited participants, with only eight companies actively selling, suggesting potential for new entrants [25].