Two of Venezuela’s four crude oil upgraders, which are necessary to process the country’s extra-heavy crude into exportable grades, have restarted after halting activities due to blackouts in March, according to a document seen by Reuters on Tuesday. The Petrocedeno upgrader, a joint venture between state oil company PDVSA, France’s Total SA and Norway’s Equinor ASA, and the Petropiar joint venture with U.S. Chevron Corp both restarted, according to the document. The upgraders, together with the Petrosinovensa mixing facility, were set to produce 298,000 barrels of upgraded crude on Tuesday. Activities at the Petromonagas upgrader, a joint venture with Russia’s Rosneft, along with PDVSA’s Petrosanfelix upgrader remained halted.