Co-ops can have an impact on their operating costs and the environment when they carefully consider energy sources and energy efficiency when engaged with asset management planning.
Different sources of energy have different impacts. Some generate no obvious pollution where consumed (photovoltaic, wind power, burning hydrogen, hydroelectricity) and others (like burning fossil fuels or nuclear fission) have well-known concerns. Even the cleanest methods of keeping us warm or powering our lights will have less impact if we use less of them.