Arbitrary, unreasonable and/or discriminatory measures
Umbrella clause
https://www.iareporter.com/articles/uk-energy-firm-draws-egypt-into-dispute-with-egpc-filing-treaty-and-contract-claims-in-relation-to-gas-dispute/ (requires subscription)
https://globalarbitrationreview.com/article/1180490/egyptian-state-entity-faces-icsid-claim (requires subscription)
https://globalarbitrationreview.com/article/1189201/egypt-faces-icsid-fight-on-two-fronts (requires subscription)
http://www.petroceltic.com/wp-content/uploads/2019/03/Petroceltic-EGPC.pdf
https://www.iareporter.com/articles/gas-sales-arbitration-against-egypt-is-discontinued-at-icsid/ (requires subscription)