Hi @alisonmichalk - think of low impact renewable energy as a subset of renewable energy. Renewable energy is a large category of different energy sources that are considered renewable in contrast to non-renewable energy (petroleum/ fossil fuels). Some types of renewable energy come at a high social/ environmental impact/cost in generating that energy. For example, during the building of large-scale dams for harnessing hydropower, communities may be displaced (a high social impact/ cost). Low impact renewable energy has been examined to ensure that its generation does not come at a high social/environmental cost. B Lab draws from the Green-e definitions and criteria to determine if a particular source of renewable energy is considered low impact.