Ecosystems are generally thought of as a plant and animal environmental habitation, where all the various species exist. Recent extrapolation of the term can apply to how products, machines, systems, etc. exist within an economic environment.
Many interpretations of the energy systems of today; oil, natural gas, coal, wind, solar, geothermal, etc. can be made. Mike Hughes, the founder of HuTech51 has taken the view of the Energy Eco-System to be all modes of power generation (fossil, nuclear, renewables, etc.) and the machines – systems required to source, generate, maintain, etc. power in the world.