Unsustainable technologies and sources cannot be considered as credible solutions to achieve a timely energy transition. This includes: fossil fuels with Carbon Capture & Storage / Carbon Capture, Utilization & Storage (CCS/CCUS), biomass with or without CCS/CCUS, large-scale hydropower that does not comply with World Commission on Dams recommendations, nuclear energy, CCS/CCUS dedicated to power plants, DACC, waste-to-energy, hydrogen from non-sustainable sources, any non-fossil fuel power plant with significant share of fossil fuel backup or dedicated to support fossil fuel infrastructure.