Choose one of the secondary sources of energy and make an argument for or against its viability as a reliable source. It does not have to be your actual opinion; in fact, choosing a stance against your opinion may help expand your knowledge. Secondary sources of energy are renewable energy sources, with the exception of hydro energy, which is a primary source. Secondary sources produce a minority of the power consumed worldwide, but their use is growing each year. There has been a push recently by governments, environmental groups, and society to better utilize these abundant resources.