Companies across the energy sector have spent recent years firmly shifting their focus toward renewable sources and ensuring their operations are as efficient and environmentally conscious as possible . And that can not be more truthfully said for the 10 companies that make up this month ’ s Top 10 . For April , we ’ re focusing on the leading sustainable companies operating in the energy space and the contributions they are making to paving a path to a greener future . Whether that be through promoting energy conservation or offering solutions to reduce carbon footprint , the showcasing of eco-friendly practices and implementation of green initiatives not only benefits the companies themselves , but sets a mark for others to follow in their footsteps .