Power Solutions International is a Fort Worth-based manufacturer of engines and power systems for industrial, transportation and power generation applications. With over 40 years of experience and 1.5 million engines sold, PSI specialises in custom-designed, fuel-flexible engines ranging from under 1 litre to 88 litres in displacement, running on natural gas, propane, diesel, gasoline and biofuels. The company provides integrated solutions to original equipment manufacturers and major customers, supported by in-house design, engineering and testing capabilities. Referrals suit PSI best when they involve businesses needing bespoke powertrain solutions for industrial equipment, specialised vehicles, or power generation applications.