Supercritical turbines, particularly those using supercritical carbon dioxide (sCO2) as the working fluid, mark a revolutionary advancement in power generation. These systems exploit the unique properties of fluids above their critical point—combining gas-like diffusivity with liquid-like density—to achieve superior performance over traditional steam turbines. Operating on a closed-loop Brayton cycle, sCO2 turbines avoid phase-change inefficiencies inherent in the Rankine cycle, enabling thermal efficiencies above 50% compared to the 30–40% typical of conventional plants. This efficiency stems from the fluid’s ability to maintain high density at elevated temperatures (250–700°C), facilitating better heat transfer and reduced energy losses during expansion. The technology’s compact design is transformative: sCO2 turbines can be one-tenth the size of equivalent steam systems, allowing modular, prefabricated units suitable for remote sites, industrial waste heat recovery, concentrated solar power, advanced nuclear reactors, and geothermal applications. This miniaturization reduces infrastructure needs, construction costs, and deployment time while enabling water-free operation—critical in water-scarce regions. Environmentally, higher efficiency cuts fuel use and emissions, and the CO2 working fluid aligns with carbon capture initiatives, repurposing captured emissions productively. Recent milestones include U.S. pilot plants generating power at over 27,000 RPM and commercial integrations in steel mills converting high-temperature waste heat efficiently without additional water or fuel. Challenges remain, including material durability under extreme pressures/temperatures, seal reliability, and control during variable loads, but ongoing innovations in alloys, predictive controls, and AI are addressing these hurdles. As nations pursue decarbonization and electrification, supercritical turbines promise resilient, decentralized energy systems that lower costs, minimize waste, and support diverse heat sources. Ultimately, they represent a pivotal step toward sustainable, abundant power, redefining resource utilization for a cleaner future.