United Kingdom
Luxembourg
Umbrella clause
Arbitrary, unreasonable and/or discriminatory measures
http://www.energycharter.org/what-we-do/dispute-settlement/investment-dispute-settlement-cases/101-vc-holding-ii-sarl-and-others-v-italy/
http://globalarbitrationreview.com/article/1078767/italy-faces-another-solar-claim (requires subscription)
http://www.iareporter.com/articles/as-sun-sets-on-one-italy-renewables-arbitration-another-rises/ (requires subscription)
https://www.iareporter.com/articles/icsid-tribunal-hearing-renewable-energy-claims-against-italy-upholds-jurisdiction-under-the-energy-charter-treaty-and-finds-limited-treaty-breaches-but-awards-only-a-portion-of-claimed-damages-to-som/ (requires subscription)
https://www.iareporter.com/articles/uncovered-icsid-tribunal-in-vc-holding-v-italy-rejects-intra-eu-objection-and-finds-partial-breach-of-investors-legitimate-expectations-of-fixed-incentives-for-renewable-energy-production/ (requires subscription)