Umbrella clause
Arbitrary, unreasonable and/or discriminatory measures
Full protection and security, or similar
National treatment
https://icsid.worldbank.org/en/Pages/cases/casedetail.aspx?CaseNo=ARB/15/40
http://www.energycharter.org/what-we-do/dispute-settlement/investment-dispute-settlement-cases/84-belenergia-sa-v-italy/