Demand Energy Storage units in the field. Credit: Demand Energy.
and thus centralized control.
“It assumes and creates the
persona that it’s 100 MWh
of storage in one big central
location,” rather than recognizing how energy is used
and where it is located, he
said. Storage on a distributed basis “can get to grid-scale
very quickly” and “is significantly more robust” than
upstream centralized grid-scale storage assets, he said.
Whether energy stor-
age is defned as distribut-
ed or grid-level is “kind of
an artifcial differentiation,”
offered Eos’ Hellman. Like
any other commodity, elec-
tricity should be managed
and stored throughout its supply chain, he believes, as a buf-
fer wherever there’s a change in scale (e.g., wholesale/bulk
to smaller volume) or in time (e.g., a day or a month to the
next day or month). Typically such management is too expen-
sive in an electricity supply chain that must instantaneous-
ly match supply and demand, but as storage technology costs
come down “you can expect to see it in just about any instance
where electricity is being transformed in time or space.” He
compares it to, of all things, oil — it’s stored at the wells as
crude, in bulk distribution centers at various points along its
supply chain during the refning process, and at the end of the
line where demand needs it at gas stations and then inside
cars and homes and businesses.