Indirect expropriation
Umbrella clause
Most-favoured nation treatment
https://www.iareporter.com/articles/peru-hit-with-arbitration-by-us-based-renewables-company-over-hydroelectric-power-project-that-ran-into-local-opposition-and-ultimately-foundered/ (requires subscription)
https://globalarbitrationreview.com/article/1198773/hydro-investor-brings-claim-against-peru (requires subscription)
https://www.iareporter.com/articles/analysis-tribunal-majority-dismisses-contract-and-treaty-claims-in-icsid-dispute-between-small-hydro-investors-and-peru/ (requires subscription)