Common Problems with renewables include: Expensive up-front cost, There are co2 emissions involved in producing these 'clean energy resources', The depletion of rare materials needed to produce them (especially solar and wind), they usually depend on specific circumstances and climates e.g. sunlight for solar and water for Tidal and HEP , Large tracts of land are required to be devoted to them, they often decimate the local wildlife e.g. Wind turbines and birds, HEP and fish