In late September 2009, Chevron filed an arbitration against Ecuador before the Permanent Court of Arbitration at the Hague alleging breaches of the US-Ecuador bilateral investment treaty (BIT). Chevron argues that Ecuador should be forced to pay the potential US$27 billion liability for environmental damages. The claim manifests a new role for BIT claims, using an investment treaty to indemnify a foreign investor prospectively from future liability in the host state.