Blue Flares and Noise Expected as Fawley Refinery Powers Up New Hydrogen Plant

Residents living near the Fawley Refinery have been warned to expect unusual noise levels and bright blue flares in the coming days as ExxonMobil begins powering up a new low-sulphur diesel production unit.

The flaring—normally seen as orange at the refinery—may appear blue during this start-up phase, a visual change that could be noticeable across the region, including from Southampton Water and the Isle of Wight.

In a public statement, ExxonMobil explained that the flaring is a safe and controlled part of the process of bringing the new hydrogen production plant online. The company acknowledged that nearby communities may hear increased noise levels, which it says it is working hard to minimise.

“The use of our flares is completely safe, but you may also hear some additional noise,” the company said. “We apologise in advance for any disturbance and thank you for your understanding.”

Fawley Refinery, which has been producing hydrogen for over 50 years, says this expansion is a significant step forward in offering lower-emission fuel options in the future. The site is the largest refinery in the UK, operating 24 hours a day, 365 days a year, and spans 3,250 acres near Southampton. It employs approximately 2,500 staff and contractors.

The new unit forms part of a broader effort to modernise operations and reduce environmental impact at the historic site, which first opened in 1951.

Authorities and local councils have been informed of the activity, and residents are being reassured that safety remains the top priority throughout the start-up process.