By: Nigel Bankes
PDF Version: Different Uses of Subsurface Storage Space: Natural Gas Storage or Compressed Air Energy Storage?
Decision commented on: OEB Decision and Order EB-2019-0287, Tribute Energy Storage Inc., Application for an order to revoke the designation of the natural gas storage areas known as the Bayfield Pool and the Stanley 4-7-XI Pool, in the County of Huron, April 9, 2020
This post focuses on an application by the project proponent and licensee (Tribute or TESI) to have the Ontario Energy Board (OEB) revoke an existing designation of a depleted gas reservoir as a natural gas storage area, with a view to potentially having the same reservoir re-licensed as a site for compressed air energy storage (CAES).
While the application to revoke the designation is the focus of this post, there are two other underlying themes. The first is the question about how we make decisions on the competing uses of underground (storage) space or pore space. I have commented on this issue before on ABlawg; the most recent post is here, with links to earlier posts. A second theme relates to the importance of establishing appropriate rules for energy (electricity) storage projects, whether these projects are battery projects, pumped hydro or, compressed air energy storage. These rules include not only the necessary tenure and licensing rules for the physical project, which is the focus here, but also, in some cases, the appropriate market rules. Should a storage project be treated as generation to the extent that it supplies energy? Should it be treated as load to the extent that it draws energy to pump water upstream or to inject compressed air? Should it be treated as transmission to the extent that it might avoid the need to reinforce transmission to an in isolated community? And how should storage be able to participate in the different ancillary markets? The appropriate characterization is important because characterization affects how the provider is compensated – either by market rules or cost of service.