Wärtsilä Corporation Annual report 2014

Wärtsilä helps Norway to become the first "carbon neutral" state in the world.

Biogas cuts Oslo’s emissions

The EU aims to reach a level of 20% renewable energy production by 2020. To facilitate this, member nations, regions and municipalities are looking beyond the traditional options to find new ways of providing for their citizens’ energy needs.

In Norway, an even more ambitious target has been set. The country plans to be the first state in the world to become “carbon neutral” and cut its net greenhouse gas emissions to zero by 2050. One of the tools they have adopted to assist in these efforts is liquid biogas (LBG), a fuel solution derived from recycling of biowaste.

As we detailed elsewhere in this report, Wärtsilä’s gas offering has expanded into gas-handling systems and infrastructure solutions such as bunkering and terminals. In 2014, Wärtsilä demonstrated yet another facet of its gas offering by delivering a biogas liquefaction plant to serve Oslo’s public transport system. The owner of the facility isWärtsilä’s customer in this case is Norwegian Cambi AS, the Municipality of Oslo’s EPC provider and a specialist in biowaste treatment.

Setting trends

“The effects of this process on the Oslo city transport ecosystem are huge,” explains Dr. Arne Jakobsen, Business Development Manager at Wärtsilä Norway. “135 buses in the Oslo region will be able to run on the fuel provided by this plant, resulting in CO2 reductions of 10,000 tons a year, not to mention particle emissions.”

The plant employs a bacterial process to produce biomethane from household food waste collected from Oslo. 50,000 tons of waste will be treated each year to produce around 14,000 Nm3 of biomethane daily.

This gas is cleaned before being refrigerated and condensed into liquid form with Wärtsilä’s Mixed Refrigerant technology. Wärtsilä’s responsibilities at the plant also include feed gas compression, biogas cleaning, and liquid biogas storage and export systems.

With the introduction of biomethane into its transport ecosystem, Oslo establishes itself at the forefront of urban environmental innovation. As a benchmark for cities across Europe and the rest of the world, the new plant makes a very compelling case indeed.

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