Hess may seek to load a cargo of stored crude from Libya’s Es Sider port this week, in what could be a major test for a recent ceasefire between warring factions who have brought the country’s oil production to a near standstill, sources told S&P Global Platts.

The company has chartered the Greek-flagged Minerva Eleonara to take on 600,000 barrels of crude from the terminal, according to a shipping report seen by Platts, and sources said it may arrive at the port as soon as Sept. 10, though its arrival has yet to be confirmed by port officials.

Libya’s National Oil Company has maintained a force majeure on Es Sider and other key ports, with the rebel Libyan National Army imposing an oil blockade as it vies for control of the country against the UN-backed Government of National Accord.

But a ceasefire after UN-mediated talks in Geneva in August could pave the way for crude exports to resume.

The Petroleum Facilities Guard militia, aligned with the LNA, has said it may reopen key oil ports to allow exports of some barrels from storage tanks that have been filled to capacity, shutting in oil and gas production.

Hess, which could not immediately be reached for comment, could be the first company to lift oil from Es Sider in nine months, except for a brief window in July, when the Vitol-fixed Kristi Bastion was allowed to export a 600,000 barrel cargo, according to Platts shipping tracking program cFlow.

Hess holds an 8.16% interest in Libya’s Waha concession, which has 13 producing fields in the Sirte Basin linked to Es Sider.

“They are unsure if it will go ahead,” a source familiar with the matter said of Hess on condition of anonymity. “They are worried the PFG won’t allow it. There is no deal on lifting the FM yet.”

NOC, which has welcomed the ceasefire while also decrying the presence of armed groups around oil terminals, was not immediately available for comment.

On Aug. 24, NOC said OMV lifted a 30,000 mt condensate cargo from the Brega terminal to free up storage capacity in a sign of deescalating tensions, though sources said a crude export from the larger Es Sider would be a much bigger breakthrough.