Germany
Netherlands
http://globalarbitrationreview.com/news/article/31446/settlements-reached-icsid-nafta-cases/ (requires subscription)
http://www.iareporter.com/articles/20120410_1 (requires subscription)
http://www.energycharter.org/what-we-do/dispute-settlement/investment-dispute-settlement-cases/32-slovak-gas-holding-bv-the-netherlands-et-al-v-slovak-republic/