Stirling Engine Market: Reviving a Century-Old Technology for a Clean Energy Future An engine design that predates the internal combustion engine is now finding new relevance in a world racing toward decarbonization. The Stirling engine market size was valued at USD 1,060.8 million in 2025, and the market is projected to grow from USD 1,161.6 million in 2026 to USD 2,400.9 million by...