2. (1) The following two types of CAES projects are prescribed as CAES projects for the purposes of clause (b.1) of the definition of well in subsection 1 (1) of the Act and of paragraph 5 of subsection 11 (1) of the Act: 1.  A CAES project in a salt cavern - being a project that uses one or more wells and other associated works for the purposes of, i.  accessing an underground salt cavern created by solution mining, and ii.  injecting, storing or withdrawing compressed air in the cavern for the purpose of producing electricity. 2.  A CAES project in a porous rock reservoir - being a project that uses one or more wells and other associated works for the purposes of, i.  accessing an underground porous rock reservoir that has been used previously for oil or gas production or hydrocarbon storage under the Act or a predecessor of the Act, and ii.  injecting, storing or withdrawing compressed air in the underground porous rock reservoir for the purpose of producing electricity. O. Reg. 151/22, s. 2. (2) Despite subsection (1), a CAES project in a porous rock reservoir is not prescribed for the purposes of clause (b.1) of the definition of well in subsection 1 (1) of the Act and of paragraph 5 of subsection 11 (1) of the Act, unless the surface area of the CAES project is located entirely within the south-western part of Ontario shown on a map entitled “Location for Potential CAES Projects in Porous Rock Reservoirs” prepared by the Ministry and dated June 1, 2021 and available on the website maintained by the government of Ontario. O. Reg. 151/22, s. 2. (3) Any pipelines, equipment or surface structures that are used in association with a well that is part of a CAES project and that, upon leaving the well, are located beyond the emergency shutdown valves or, if there is no emergency shutdown valve, beyond the first isolation valve do not form part of the CAES project and are exempted from the definition of “work” in subsection 1 (1) of the Act. O. Reg. 151/22, s. 2. (4) Despite subsection (3), the pipelines, equipment or surface structures described in that subsection do form part of a CAES project and are a “work” within the meaning of the definition of that term in subsection 1 (1) of the Act when they are being used, (a)  in the case of a CAES project in a porous rock reservoir, to prepare the porous rock reservoir for use as part of the CAES project by producing any remaining oil, gas or formation water from the reservoir; or (b)  in the case of both types of CAES projects, in association with the drilling, completion, maintenance, servicing, overhauling, working over, abandonment or decommissioning of a well, underground salt cavern or porous rock reservoir. O. Reg. 151/22, s. 2. (5) A CAES project in a porous rock reservoir includes, (a)  all wells and associated works that were previously drilled and used for other purposes under the Act or a predecessor of the Act and that will be used in association with the CAES project; and (b)  all new wells and associated works that may be drilled and used in association with the CAES project. O. Reg. 151/22, s. 2. (6) For greater certainty, wells are not considered to be part of the CAES project for the purposes of this Regulation if, (a)  the wells are used to conduct geological evaluations or testing of a porous rock reservoir to determine if the reservoir is suitable for use in a CAES project in a porous rock reservoir; and (b)  the evaluations or testing take place before any licences are granted under the Act for wells that are to be used in association with the CAES project in a porous rock reservoir. O. Reg. 151/22, s. 2. (7) For greater certainty, (a)  wells that are used to remove the last of the producible oil, gas or formation water remaining in a porous rock reservoir in order to convert a porous rock reservoir for use as part of a CAES project in a porous rock reservoir are considered to be part of the CAES project in a porous rock reservoir for the purposes of this Regulation; and (b)  no person shall use a well for a purpose described in clause (a) unless the person has submitted an application in accordance with section 2.4 for a licence under subsection 10 (1) of the Act to use the well for such a purpose, and an injection permit if required, and the licence and permit have been issued. O. Reg. 151/22, s. 2.