Sustainable development is gradually integrated into policies worldwide, meanwhile, government authorities and policymakers, alongside public and private enterprises, are signaling the growing scope and scale of investment opportunities in this field. Capital cuts and decreasing generating costs are fueling the market in renewable technologies. At the same time, bilateral and multilateral treaties are being negotiated, which set the framework for expanding sustainable solutions: treaty regimes increasingly encourage and promote trade and investment for more sustainable energy development, responding to global concerns on climate change. Investment protection litigation offers new insights into trends in jurisprudence, demonstrating how this field of law can be instrumental not only for protecting undertakings’ interests, but holding countries to their commitments under international treaties for the protection of the environment.