Why Equinor’s Hywind Tampen quietly changes offshore wind economics

Reviewed: ad hoc news Lifestyle & Consumer desk. Edited and checked on 2026-06-19, 10:22. Details in the imprint.

With Hywind Tampen, Equinor puts a ring of floating wind turbines into the steel-grey North Sea that quietly feeds cleaner power to aging oil and gas platforms. Eleven giants bob on the swell, their rotors turning above supply ships and rig silhouettes.

What Hywind Tampen actually is

Hywind Tampen is a floating offshore wind farm about 140 kilometers off the Norwegian coast, built to supply electricity directly to the Snorre and Gullfaks platforms in the North Sea. Each turbine stands on a floating concrete hull, anchored to the seabed.

The project has an installed capacity of around 88 megawatts from eleven Siemens Gamesa turbines, making it the largest floating wind farm that is currently in operation. According to Equinor, it can cover around 35 percent of the annual electricity demand of the two oil fields.

How it cuts emissions on the rigs

Normally, offshore platforms in this area burn gas in on-site turbines to generate their own power, with constant noise and flaring. With Hywind Tampen feeding in, more of that combustion can stay switched off, which directly lowers CO2 emissions.

Equinor estimates that the wind farm can reduce emissions from the Snorre and Gullfaks fields by about 200,000 tonnes of CO2 per year. For workers on the platforms, that does not just mean cleaner numbers in a sustainability report, but slightly quieter deck ambience when gas turbines ramp down.

Floating technology and layout

Unlike fixed-bottom wind farms in shallower waters, Hywind Tampen relies on semi-submersible concrete structures that stay upright thanks to ballast and mooring lines. The North Sea swells move the platforms gently, but sensors and control systems keep the rotors pointed into the wind.

The turbines are spaced out in a loose ring-like pattern between the two oil fields, with subsea cables running back to the platforms. Seen from a supply ship, the farm looks like a scattered forest of white towers rising out of the grey water, blinking red at night.

Costs, support and partners

The project budget has been reported at roughly NOK 7.4 billion after cost increases, with significant public support from Enova and the Norwegian NOx Fund to get the first-of-a-kind installation built. That mix of state backing and corporate capital underlines how complex early floating wind still is.

Equinor leads the project with partners including Petoro, OMV, Vår Energi, Wintershall Dea and INPEX Idemitsu, which all have stakes in the fields benefiting from the power. For them, Hywind Tampen is both a decarbonisation tool and a large-scale technology pilot.

How it feels in daily operation

From the control rooms on Snorre or Gullfaks, Hywind Tampen appears as an extra power source in the energy mix, rising and falling with wind speeds. On stormy days, the turbines hum steadily and the platforms lean a little less on their gas turbines.

Maintenance crews reach the towers by boat or helicopter when weather windows allow. The towers themselves feel like small islands - steel ladders, cramped nacelles, a mix of sea spray, oil smell and the constant low thrum of gearboxes and generators.

Limitations and technical challenges

Hywind Tampen does not run the platforms alone. On calm days, gas turbines still need to pick up the slack, and the variability of the wind resource makes stable planning a challenge for operators who are used to controllable generation.

Floating foundations are expensive, with complex installation and mooring work at sea. That pushes up the cost per megawatt compared with conventional offshore wind, which is one reason why public funding and demonstration status are so central for this project.

Why investors watch the project

For Equinor ASA, Hywind Tampen is not primarily about selling green power to the grid. It is a proof point that the company can take offshore engineering experience from oil and gas and transfer it into commercial floating wind at scale.

Analysts and investors see the project as a test case for Equinor’s ability to build a portfolio of floating wind assets in markets like the UK, US and Asia, where deep-water sites will need similar technology. The learning curve here will influence costs and margins in future bids.

Context and stock reference

Hywind Tampen fits into Equinor’s broader strategy to cut the carbon intensity of its operated oil and gas portfolio while building out renewables alongside hydrocarbons. It sits next to other projects such as Dogger Bank and future US offshore wind leases in the company pipeline.

Shares of Equinor ASA (NO0010096985) trade on the Oslo Stock Exchange under the ticker EQNR, with secondary listings including the New York Stock Exchange.

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