Power systems have been evolving during the past century. The electric grid is getting more and more sophisticated due to modern technologies and business requirements, such as implementation of smart grid technologies, deployment of utra-high voltage transmission systems, and integration of ultra-high levels of renewable resources. All of these factors are challenging today’s energy forecasting practice. We have organized this special section of the Journal of Modern Power Systems and Clean Energy to answer the following question: How to better forecast the demand, supply and prices to accommodate the changes in modern power systems? The special section collects 9 papers addressing various energy forecasting problems, including six on load forecasting, two on solar irradiance forecasting, and one on electricity price forecasting.