A Ph.D. in Energy Science is a research-oriented program that investigates sustainable energy systems, renewable energy technologies, and the fundamental concepts that underpin energy production and consumption. The curriculum typically lasts 3 to 5 years and covers topics such as solar, wind, bioenergy, energy storage, and energy policy. Students conduct theoretical and practical research to address global energy concerns, increase energy efficiency, and develop novel clean energy solutions. In most cases, admission requires a Master's degree in Environmental Science, Physics, Chemistry, or a related discipline. Graduates improve energy research, sustainability, and policy by pursuing positions in academia, research institutions, or the energy industry.