Why 100% renewable energy is not enough


In highly renewable power grids, the availability of clean power from water, wind, and solar resources will vary by location, season and time of day. Environmental accounting tools can no longer rely on annual and national averages to capture the underlying physical reality. As more detailed data becomes available, such tools must now evolve to capture heterogeneity at the appropriate scales in space and time. Only then will they accurately monitor and guide future energy transitions.