25 CFR §162.543

1. (a)A WSR lease must provide for the installation of a facility and associated infrastructure of a size and magnitude necessary for the generation and delivery of electricity, in accordance with § 162.019. These facilities and associated infrastructure are considered permanent improvements. A resource development plan must be submitted for approval with the lease under § 162.563(h).
2. (b)If the parties agree to any of the following changes to the resource development plan after lease approval, they must submit the revised plan to BIA for the file:
   1. (1)Location of permanent improvements;
   2. (2)Type of permanent improvements; or
   3. (3)Delay of 90 days or more in any phase of development.