Around 100 firefighters and 15 fire engines tackled the blaze at the three-story depot in Erith, south London, on Friday afternoon.
Hundreds of staff were evacuated, but no injuries were reported.
London firefighters said the blaze was “very deep” but was under control at 2:17 a.m. on Saturday.
Station Commander Steve Vydelingum said: “The firefighters worked hard in the hot and difficult conditions inside the warehouse.
“Firefighters will continue to be on the scene until Saturday to alleviate hot spots. “
Hidden to dit The independent that only a small part of the warehouse robot grid had been damaged and that the installation would return to normal “within the next week”.
“The incident appears to have been caused by the collision of three robots on the network causing a fire,” the company said in a statement.
“The correct protocols were successfully implemented including the evacuation of the building, the activation of the sprinkler system and the presence of the London fire brigade. No one was injured and all colleagues on site are safe. Damage is limited to a small section of less than 1% of the network that has been contained by planned fire mitigation measures.
“Apart from some residual smoke odors, the vast majority of CFCs [customer fulfilment centre] is in good condition. Although we expect operational disruptions, we are working to restore normal service as soon as possible.
“We would like to thank the London Fire Department and all other emergency services for their hard work and professionalism in handling this incident.”
Ocado has also apologized to customers after being forced to cancel some deliveries and temporarily block new orders.
“We’re so sorry,” Ocado tweeted. “Due to a major incident at our Erith warehouse, some of our orders were canceled. Please be patient with us while we handle this. If this has an impact on your order, we will contact you. Thank you. “
Two years ago Ocado lost around £ 110million when a fire destroyed its warehouse in Andover, Hampshire. A small fire also broke out in a dumpster at Erith’s depot a few months later in August 2019.