Man has utilized energy for millions of years. Unfortunately, our usage of fossil fuel has given rise to global warming and climatic changes. Thankfully, there are better energy alternatives that do not pollute the environment. Engr. Julian K. Igbo relies on his education and professional experiences to delve into renewable energy alternatives, define energy, illustrate energy at work, and explore all aspects of solar energy and how it works. Guided by results from his extensive research, Igbo examines efficiency ratings for solar panels, shares factors to be considered before installing solar panels, and explores the differences between active and passive solar systems. Included in his guidebook is an examination of battery banks and wind energy, information on how to locate continents on the hemisphere, and a list of safety precautions. Harnessing the Sun's Energy is a guide for students and professionals that utilizes research and facts to explore the application and usage of solar/renewable energy sources that will protect our environment for generations to come.