A central goal of global climate strategies is achieving net-zero greenhouse gas emissions by mid-century. Shifting from fossil fuels to renewables requires durable, efficient materials. High-entropy materials (HEMs) are revolutionizing this transition with their exceptional properties. HEMs, comprising five or more elements, offer high configurational entropy, stability, and versatility. They excel in energy applications due to their thermal and structural stability, corrosion resistance, and tunable conductivities. HEMs find use in batteries, fuel cells, electrocatalysis, and hydrogen storage. In batteries, HEMs enhance cycling stability and capacity, while also serving as solid-state electrolytes. As electrocatalysts, HEMs outperform noble metals in fuel cells. Notably, HEMs show promise in hydrogen storage and production, offering high capacity and catalytic activity. Economically, HEMs avoid scarce elements, reduce waste, and enable cost-effective energy solutions. However, challenges in scaling and commercialization hinder their widespread use. Despite obstacles, HEMs represent a significant advancement in sustainable energy materials.