Historical core
Oil and gas has been the foundational sector for modern investment arbitration. The 1970s OPEC nationalisations established the doctrine of full and effective compensation; the 2000s Venezuelan and Russian cases tested every aspect of expropriation analysis.
Production-sharing renegotiation
The most common claim type today is the renegotiation or unilateral amendment of production-sharing agreements (PSAs). When commodity prices spike, host states routinely seek a larger share of revenues; when they collapse, investors negotiate relief that may later be revoked.
Climate-policy measures
An emerging dispute category arises from climate policy: permit revocations, accelerated decommissioning, new restrictions on exploration, and tax measures targeting fossil-fuel producers. The doctrinal analysis tests the boundary between legitimate climate regulation and protected investor expectations.
See our analysis of how the transition cuts both ways.
Treaty bases
The Energy Charter Treaty has historically been the dominant treaty basis for European-Russian and intra-EU oil and gas disputes. BITs remain the standard basis elsewhere.
Where to watch
Central Asia (Kazakhstan, Turkmenistan) for legacy PSA renegotiations, Latin America (Mexico, Argentina, Ecuador) for resource-nationalism measures, and globally for climate-policy disputes.