Equinor has signed a deal worth up to $90 million for the long-term charter of a pair of specialised offshore support vessels as the Norwegian oil and gas giant aims for increased power-from-shore capability in its chartered fleet.

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Havila Shipping’s platform supply vessel duo Havila Charisma and Havila Foresight have both been handed new firm three-year charters, each with a quartet of one-year extension options.

Norwegian state-controlled player Equinor said on Thursday that the total value of the deals, inclusive of all options plus some modifications to the Havila Charisma, is nearly Nkr800 million ($90.93 million).

Both of the vessels have already been fitted with a battery and adapted for power-from-shore capability, which Equinor said increases safety and also reduces carbon dioxide emissions.

“All vessels on longer-term contracts for Equinor (approx. 20 vessels) have, or will have, a battery and a shore-power system within 2021,” Equinor added.

Both the Havila Charisma and Havila Foresight have worked with Equinor since their delivery in 2012 and 2008, respectively.