United Kingdom
Luxembourg
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)