Essays in Energy is a collection of a number of essays by the same number of engineers. They show a variety of viewpoints and diversity. This collection is meant to incite and excite conversation among engineers, scientists, and society at large. It would serve as a catalyst for a three-credit course as an introductory engineering subject to non-engineering university students. As university education develops to better prepare future leaders to appreciate science, technology, engineering, and mathematics, engineering courses for non-engineering majors are essential and so is the requirement of worthy textbooks. This monograph intends to be one of the useful tools available. The wide range of topics includes nuclear power, small hydroelectric plants, wind turbines, and organic photovoltaics. Nanotechnology, natural gas, and deep sea oil drilling are presented as well.