Onshore Power Supply OPS

Onshore Power Supply reduces noise and pollution!

OPS, HVSC, Cold Ironing or Shore Connection are all the same and means that both ships and harbors are adjusted for ships to connect to the regular power supply system through an electrical cable. The return of investment (ROI) for this is approximately six months to a year.

If all ships shut down heir auxiliary engines and connected to shore electricity instead, the impact on the environment would be significant worldwide.

By using shore electricity, the auxiliary engine can be shut off and both noise and emission of carbon dioxide, sulfur oxide and nitrogen oxide are thereby considerably reduced. Some of the benefits are:

  • Less emissions
  • Less noise
  • Less costs
  • Improved working environment on board


Interview with Per Lindeberg, former electricity manager at the Port of Gothenburg (English subtitles)


Information about OPS


60 Hertz transformation solutions by Actemium

A previous difficulty has been that many ships require 60 Hz system. In the EU the net frequency is normally 50 Hz. For ships with the 60 Hz system the electricity therefore must be transformed, and the frequency converted from 50 Hz to 60 Hz. To be able to use OPS on ships with 50 Hz system, we construct and build converters that can handle both type of ship frequencies or OPS directly connected to the 50 Hz system ashore.

Today, with modern technology, high voltage can be transferred to ships, which reduces the necessary amperage considerably and thereby also the number of cables for connection. The system is based on a building on the berth, containing switch gears, frequency converters and transformers that, through a Davit and stands, supply the ship with shore electricity. The ship then converts the high voltage through transformers to its own operating voltage. More and more harbors are now offering the possibility to connect to onshore electricity.

We supply the buildings, switch gears, frequency converters and transformers. Also included in our commitment is design and commissioning of the plant. Our experience on these plants is extensive.


Probably the world leader in OPS installation

Actemium has built several shore connection plants for the port of Gothenburg and for Stena Lines ferry service in Gothenburg, which started in 2010. Since then we have built OPS plants in harbors in both Sweden and Norway. We have built mobile plants in Gothenburg (Sweden), Nynäshamn (Sweden) and Kristiansand Harbour (Norway). The Norwegian plant is customized for the offshore industry. In 2019, projects in both Antwerp and Dunkerque stared.


The OPS plant is mobile

What makes this special is that it is entirely built onto a large removable container, where all technical equipment is already installed when put into place. An additional feature of using container is that, if need arises, it can be relocated for use in other places around the port. Mobile advantages:

  • Easily move your container if your demands changes.
  • Connect the container in any port in the world in about a week from delivery.



Apart from a few days of commissioning, all the production takes place in our Stora Höga workshop. After all of the installations are done, the container is shipped or transported by truck to the harbour, where the actual connection takes place.

In or range of solutions we also construct 11 kV, 50 Hz to 11kV, 60 Hz, 2,3 MVA in different sizes up to 11 kV, 50Hz, 2×3,75 MVA. Check the reference list and you will see exact construction options already performed. Technically, you enter 690 VAC 50 Hz and convert it to 60 Hz. The transformer is 1250 kVA and out comes 690 o 440 VAC depending on the costumer’s wishes. In special cases, you can also switch 440 VAC to 480 VAC.

HVSC – High Voltage Shore Connection

LVSC – Low Voltage Shore Connection

Cold Ironing



  • Ingemar Gustavsson

Actemium OPS

Phone +46 (0)70 579 81 49


  • Johan Engmalm

Actemium Elektriska

Phone +46 (0)70 579 81 95