A little about the project
Klosterenga park is a borough park in Bydel Gamle Oslo. The work on the sculpture park has been ongoing in several stages and now appears, after the 100% electric project of bringing Hovinbekken forward today, as an adventure park with the stream flowing through the sculptures in a system of gutters, vessels, water stairs and a pool.

• Start of construction: August 2021
• Official reopening of the park: June 10, 2023

100% electric
As requested by the client Water and Sewerage Authority in Oslo that the project should have a high environmental profile and therefore weighted the environment to 30% in the award criteria. Selected contractor for the project, Braathen Landskapsentreprenør AS responded by going 100% emission-free (i.e. all construction machinery, transport and tools used in the project), despite the fact that projects of this size and variety had never before been completely emission-free. This has probably Reduced emissions in the project by about 400 tons of CO2 compared to a traditional diesel-powered plant site.

The project, which included 1,500 m of trenching, removal of 10,000 tonnes of contaminated masses and 5,000 m3 of internal mass redistribution, 12 larger concrete structures, as well as the reopening of 450 m of Hovinbekken and the working up of a park area of 66,000 m2, was very diverse and involved a wide range of zero-emission solutions:

• 18 ton Zeron belt excavators on cable
• 18 ton wheel excavator on battery
• Battery-electric trucks
• Electric Mini Excavators
• Electric Mini Dumper
• Electric Wheel Loader
• Electric Lifts
• Electric mini crane
• Electrical unblocking
• Electric 500 kg vibroplate (self-made)
• Eviny Mobil Energy fast charger container (directly connected to the mains, for onsite fast charging of machines and trucks)
• Solar-based container solution for charging battery-electric equipment

Experiences — Entrepreneur
Entrepreneur has made a conscious choice and wants to be a leader on environment in the industry. This is also reflected in the experiences the company has made:

• Our experience in the transition to electrical machinery is good and allows us to innovate/develop as a company
• We see that there is good production when the conditions are right
• Part of the key lies in motivating employees to take the transition as a positive challenge
• Important to include subcontractors and suppliers with regard to the framework conditions/award criteria for the project (their setting and feasibility are important to consider when selecting subcontractors and suppliers)
• Power/power access can be a challenge in some cases
• There is great interest in emissions-free construction projects, which leads to a significant development in terms of dissemination and sharing with others*

*) The project has had “100-vis of electrification tourists” from all over the world, including Japan's largest contracting company (Obayashi Corp.), EU delegations, the UK's trade attaché, a number of Norwegian municipalities, several major machinery manufacturers, competitors,...

Why emission-free? — Experiences — Client
Oslo Municipality has an ambitious climate strategy with a clear goal of reducing greenhouse gas emissions from construction and construction activities. This is reflected in the municipality's various agencies, including the Water and Sewerage Authority, and their operations. The Oslo Water and Sewage Authority has thus gained experience with fossil-free and emission-free plant operation through several projects. Klosterenga park is therefore referred to by the Agency as an emission-free project without being a pilot...! Their experiences with emission-free plant operations in general and procurement in particular can be summarized as follows:

• Electric powertrains save energy, have no exhaust and make less noise
• Preferred by neighbors and workers
• The price of electrical equipment will go down, while the quality will go up. This provides higher investment now, but lower total cost over time
• Biodiesel is a finite resource, and thus not a global solution
• Biogas is good, but also this is a limited resource
• Procurement with negotiations in two stages is positive also considering the environmental part of the project. Provides, among other things, the possibility of a thorough review of the machine list.
• The offers that came in had little difference in price, but big differences with respect to the environmental criterion proportion emission-free

Success criteria for emission-free/electric plant sites — Client
The Water and Sewerage Authority in Oslo has done many of the same thoughts mentioned under the supervisor's What does it take to succeed?:

• Focus on solutions
  — What can we achieve?
  Dare to ask
• Good planning ahead of time
  — Mapping, overview and arrangement of electricity for electrical machinery and equipment
  — The contractor must have ownership of the solutions
• Good follow-up in project implementation
  — Create good dialogue with performers from the start. Problems are detected early and can be corrected
  — Data collection (consumption) for experience basis and reporting

About the acquisition

• Acquisition with negotiations in two stages (pre-qualification)
• Main reason for the chosen form of acquisition: the interface of the art delivery and the artist team
• Negotiation round positive for the environmental part and thorough review of the machinist
• Award criteria (cf. V02 Competition Basis), weighting: price 40%, environment 30%, quality 20%, mission understanding 10%
  — Weighting within the environmental criterion: 50% machinery, 40% mass transport and 10% other transport.

For related articles — feel free to read

• Spill-free stream opening at Klosterenga — NAML article from the start of the project
• Rigging for an emissions-free future — NAML article on how entrepreneurs think about an emissions-free future

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