Ca Voi Xanh (CVX) was discovered in 2011 and lies in the shallow waters of Block 118 in the Song Hong Basin near the Chinese 9 dash maritime border claim. The field is Vietnam's largest gas discovery with a gross gas volumes estimated to seven tcf (including CO2). On January 2017 PetroVietnam and ExxonMobil have cleared a crucial commercial hurdle by signing a framework heads of agreement on the development and more importantly the gas sales for CVX. CVX will underpin Vietnam's biggest power generation project. The gas will be transported onshore via an 88 kilometer pipeline and will initially fire up four power plants with a combined capacity of 3 000 MW. The power plants will have a capacity of 750 MW each and are all expected to be commissioned between 2023 and 2024. A fifth 750 MW power plant may be added in 2026.