17 Jun '17, 10pm

The Grid Needs a Symphony, Not a Shouting Match - Rocky Mountain Institute:

Seconds to minutes. At these short timescales, the grid needs “ancillary services” to maintain reliability and ensure that demand and supply always match. Traditionally, these services have been provided by fossil or hydroelectric generators with spare capacity, but increasingly, it’s becoming cost-effective to procure them from distributed energy resources and other new, clean energy alternatives.For example, a utility-scale solar plant in California has shown that many of these ancillary services can be provided as a valuable byproduct of the plant’s inverters—extremely reliable solid-state power-electronics devices already paid for by their primary task of conditioning renewable power to feed into the grid. Aggregators in the PJM grid are controlling fleets of water heaters to balance second-to-second mismatches between demand and supply. And importantly, these and othe...

Full article: https://www.rmi.org/news/grid-needs-symphony-not-shouting...

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