The HHO generator market is experiencing significant growth worldwide due to the rising demand for energy-efficient and low-emission solutions in sectors such as automotive, marine, and industrial. The market value reached USD 912.7 million in 2024 and is expected to grow at a CAGR of 7.8% until 2035. HHO technology is being increasingly adopted as an additive enhancement to traditional fuel systems to meet strict emission regulations and reduce fuel costs. The ease of installation, coupled with environmental awareness, is driving the market towards HHO kits as attractive upgrades. Countries across the globe are embracing hydrogen-assisted fuel enhancements for various applications, including passenger vehicles, trucks, boats, and industrial engines. The benefits of HHO generators go beyond emission reduction; they also contribute to engine efficiency, clean running engines, and extended travel capabilities. The market is witnessing advancements in electrolysis efficiency, system design, and automated fuel control systems, which further enhance the operational quality of HHO generators. Government initiatives focusing on emissions reduction and the transition to cleaner energy sources are propelling market growth. For instance, the U.S. Department of Energy reported a significant increase in electrolyzer installations, reflecting substantial private-sector investments in hydrogen technology. Key players in the HHO generator market include HHO Plus, HHO Bulgaria, Hydroxy Gas India, HHO Kits Direct (UK), and others. Innovations in electrolysis, compact cell development, and safety features are driving market expansion. Initiatives like the National Green Hydrogen Mission in India and the Green Hydrogen Standard are shaping the future of hydrogen technology globally, fostering market growth and sustainability.