Umbrella clause
Arbitrary, unreasonable and/or discriminatory measures
http://www.kslaw.com/InternationalArbitration/brochure/files/assets/basic-html/page8.html
http://www.iareporter.com/articles/italy-claims-a-trio-of-energy-charter-treaty-arbitrations-emerge-in-stockholm-a-tribunal-is-appointed-at-icsid-and-some-repeat-players-are-beginning-to-emerge/ (requires subscription)
http://www.energycharter.org/what-we-do/dispute-settlement/investment-dispute-settlement-cases/106-cef-energia-bv-vs-italy/
https://www.iareporter.com/articles/in-new-award-majority-of-ect-tribunal-finds-that-italy-breached-fair-and-equitable-treatment-standard-in-intra-eu-solar-case/ (requires subscription)