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Council and vendor weigh capacitor 'graphene' storage against lithium‑ion batteries
Summary
Presenters showed a capacitor‑based storage container (4.2 MWh) as an alternative to lithium‑ion batteries, highlighting near‑instant cycling, >99% round‑trip efficiency claims, and a performance guarantee; council asked for cost and ROI details.
Priority Power described two storage approaches: conventional lithium‑ion batteries, which the vendor noted are chemically based and have thermal‑runaway risk, and a large capacitor solution built into 40‑foot shipping containers using graphene materials that the firm said can cycle nearly unlimited times and sustain long service life.
The vendor described the container approach as storing roughly 4.2 MWh (14 kWh modules stacked) and claimed very high round‑trip efficiency. They acknowledged higher upfront cost—about 60% more than lithium‑ion in one of their examples—but said tax‑credit treatment and the technology’s cycling characteristics can deliver long‑term value. Council members asked for ROI examples and vendor pricing to be shared later in follow‑up materials.
