Ørsted – New Biomass CHP – Asnæs Power Plant Unit 6

Asnæs Power Plant

Asnæs Power Plant


Mogens Skov

Mogens Skov

Global Spearhead Director, Power Generation
T: +45 5161 3390
Bernd Kim Okkels

Bernd Kim Okkels

Head of New Technologies, Process & Solar
T: +45 51612377

Services we provided


Ørsted decided that by 2023, coal will no longer be used as fuel at the company's power stations. The decision was and still is a result of the company's vision to lead the way in the transformation to a sustainable energy system.

Therefore, a project was defined for the Asnæs Power Station to be converted to renewable energy utilising Ramboll’s expertise in the role as Owner’s Engineer (OE) for technical consultancy and advisory. 

Feasibility study

Ramboll was responsible for the feasibility study for a new unit. The unit is a high-efficiency 142 MWth biomass fired CHP plant designed to deliver process steam to adjacent industry and district heating to the local municipality of Kalundborg as well as power to the grid.

Basic engineering and construction phases

Ramboll was in continuation of the feasibility study commissioned with the consultancy work for the subsequent project phase consisting of engineering and design. Subsequently, Ramboll was also commissioned with the consultancy work for the project execution phase as OE comprising engineering, detailed design and construction. Furthermore, during installation Ramboll was responsible for HSE coordination and supervision of the contractor’s work.


The selected concept comprised facilities for receiving, screening, conveying and storing woodchips primarily from forestry but also other fresh biomass feedstock. 
The energy was converted in a traditional steam generator/turbine set-up but designed to accommodate for multiple operation modes including a complex mix of process steam, district heating and power production.

To meet the stringent environmental requirements and the high efficiency target, the plant was equipped with state-of-the-art flue gas cleaning as well as flue gas condensation and combustion air humidification. 

The condensate was cleaned and used as make-up water for the water-steam cycle.

The CHP plant was set to achieve a thermal efficiency of 110.5 % based on Lower Heating Value and supply 66 MW process steam, 65 MW district heating and 25 MW electric power (nominal data).

The services provided included

  • Outline process design
  • Analyses of possible concepts and concept selection
  • Preparation of technical description of selected concept
  • Input procurement strategy
  • Preparation of time schedules
  • Outline layout (3D model, CAD drawings)
  • Process Flow Diagrams of main systems
  • Single line diagrams
  • Sourcing strategy (CAPEX)
  • Planning permission applications (e.g. environmental impact assessment)
  • Tendering documents for all contractor lots
  • Follow-up on contractors engineering work
  • HSE coordinator on construction site
  • Supervision of contractors site work
  • Supervision for M, E and B
  • Handling technical claims


First Floor, Emerald Building
Oud Metha Road
PO Box 116921, Dubai, UAE
Tel:+971 4 334 3616
Fax:+971 4 334 3617

Mail: info@ramboll.ae

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