The electric power industry is changing rapidly, with more customers increasing demand and asking for improved response times and more renewable technologies. To prepare our power systems for the next generation, we need to improve both long- and short-term investment planning for generation technologies and systems. This project will aid that effort by developing new data designs that can be used to create methods for optimizing large engineering systems. Through this work, we will significantly improve planning for advanced electric power systems that combine renewables and other technologies to meet environmental and energy requirements, and will identify system designs that cost less and are more resilient.