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Energy and Climate

Ensuring buildings have good building envelopes reduces energy consumption. This includes well-insulated facades, roofs, floors, and windows, as well as energy-efficient fittings. Furthermore, renewable energy should be generated locally. In Stockholm Royal Seaport, energy calculations are submitted for all phases of building projects. Recorded values are submitted after a building has been in use for two years. Construction sheds should be energy-efficient, and electricity used to power portable buildings and construction sites should be environmentally certified. The climate impact of built-in materials should be minimised.

3.4 Efficient energy use

To reduce energy use, all new buildings are low-energy buildings with well-insulated building envelopes and energy-efficient fittings. The first review of Norra 2, two years after occupancy, showed that the projected values for energy use were exceeded. Metered energy use in Norra 2 was on average 70 kWh/m² per year Atemp and is therefore 27 per cent higher than Stockholm Royal Seaport’s target. However, this is 22 per cent better than applicable Swedish building code regulations and means that buildings in the area meet the zero-energy directive. Read more

New energy building management regulations are discussed in Snåret. The National Board of Housing, Building and Planning has introduced weighting factors in the new BBR, but what do these changes mean and what is required to meet the stricter energy requirements? In Svensk Byggtjänst’s podcast Snåret, Christina Salmhofer, Sustainability Strategist at Stockholm City Development Administration, and Energy Expert Birgitta Govén discuss construction companies. Christina mentions several examples of how we work in Stockholm Royal Seaport. 
Development sites
Buildings’ energy performance

Energy calculations are submitted for all phases of a building project. Metered values are submitted after a building has been in use for two years according to Stockholm Royal Seaport requirements, under which electricity for heating and hot water is weighted by a factor of 2 and then adjusted according to BEN and benchmark years. In addition to this, solar energy is not included in energy performance figures from and including Brofästet. It should therefore be stressed that data presented here are not comparable with calculations made according to Swedish building code regulations, because these do not apply weighting and include solar energy.
More about this under Brofästet >

Requirements:

  • Norra 2, Brofästet and Gasverket: dwellings 55 kWh/m² and commercial premises 45 kWh/m² specific energy.
  • Södra Värtan: dwellings 50 kWh/m² and commercial premises 45 kWh/m² net energy.
  • Existing buildings in Gasverket: target 50 per cent reduction.
  • Norra 1, Västra and Värtaterminalen have voluntary commitments.

Energy use is presented in kWh/m² Atemp and per year and includes energy for heating, hot water, property electricity, and comfort cooling. Additions for air circulation in commercial premises may be made according to the National Board of Housing’s.

Energy performance has improved successively from phase to phase, at the same time as Swedish Building Code regulations have become stricter. Reported values are for purchased energy. In Norra 1, Västra and Värtaterminalen energy commitments were voluntary, and developers’ own data is nor reviewed by the City of Stockholm. Results have not been reported according to the same criteria (weighting, adjustments) and are therefore not comparable with subsequent phases.

Diagram 3.9 Average energy performance per phase, kWh/m² Atemp  and year 

Energy performance per phase and developer

Norra 2

Norra 2 was the first phase to subject to the stricter energy requirements and weighting factor 2 for electrical heating. All sites are connected to district heating and have Air Handling Units (AHU) with heat exchangers for air treatment. In this phase, it was possible to credit all locally produced energy. Form factor, proportion of window area, and insulation performance of building envelopes varies. Less favourable conditions could partly be compensated for by technical installations such as solar collectors, solar panels, and wastewater heat exchangers.

All developers have submitted metered values; however, not all requirements were met. The City of Stockholm and developers have continued to discuss causes of deviations from requirements. Subsequently, a strategy has been developed to remedy shortcomings and errors in order to achieve requirements. All developers reported more heat loss than expected, especially for ventilation, hot water circulation losses, and thermal bridges. Other causes that have been identified are problems with meters, system readjustments, and faulty connections that were not detected until warranty inspections. Hot water use in almost all buildings was lower than the standard value. Property electricity has decreased after the first reporting of metered values. The installed wastewater heat exchangers and solar collectors do not achieve the suppliers’ promised performance. Measurement of energy use in garages needs to be reviewed. System tuning and adjustment, as well as measures to address construction and technical installation errors, are ongoing. There are also shortcomings in the handover from project planning to construction work and from construction work to property management. Developers will present the results of this work after the 2021 heating season.

This feedback of experience with learnings from the Norra 2 phase makes an extremely important contribution to improvements in the construction sector. Proactive and transparent collaboration between all parties has created an important knowledge platform.

Adjustments to the monitoring phase have been made according to the National Board of Housing regulations but needs to be improved and developed.

These dialogue meetings have provided important insights and learnings for the construction of energy-efficient buildings throughout the entire construction process – from design and construction to operation and management. Potential exists to improve all parts of the construction process from project planning, energy co-ordination, as-built documentation, to handover to maintenance staff and management. The experiences gained are unique and will contribute to capacity enhancement throughout the construction sector. Updates to recorded values after these measures have been conducted took place during autumn 2020.

Diagram 3.10 Energy performance Norra 2, kWh/m² Atemp per year

Comments:

  • Bonava reported higher heat use, marginally worse solar cell performance, and around 3 kWh/m² lower hot water use than projected, despite the wastewater heat exchanger being un-operational for a period of time. The greater heat requirement is explained by an imbalance in the ventilation system, higher indoor temperatures, alignment deficiencies, and a surcharge for comfort floor heating which is electrically powered and thereby weighted with a factor 2.
  • Heba recorded higher heat use due to hot water loss, higher airflow than projected, alignment problems. Several steps have been taken to address these issues, such as the review of AHU performance, ventilation systems, and alignment of heating systems, which has resulted in a reduction in energy use.
  • SSM had higher metered heat use than projected. Solar energy metering was substandard and could not be included in the latest review. Hot water use was lower than estimated. Monitoring routines need to be improved.
  • Viktor Hanson had higher heat use due to measurement errors, faulty fittings in heating systems, and other areas that impact energy performance of solar collectors and floor heating which were detected during final inspection. These have been adjusted and largely addressed, although work in this area remains to be done.
  • Wallenstam dwellings have faults with heating systems and property electricity use was slightly higher than projected. Improvements have been made to monitoring routines. Reporting of faults, shortcomings, and adjustments are continuing and have worked well to date.
  • Wallenstam pre-school has high heat use due to its ventilation system not being demand-controlled, resulting in greater air flow, extended periods of operation, and high indoor temperatures. User behaviour has played a key role here. Alignment and remedial actions are ongoing and are expected to show improved results.
  • Erik Wallin identified shortcomings in electric batteries used to power apartments’ AHU units and had electrically powered comfort floor heating which is classed as factor 2. The solar collector array failed to fulfil its promised potential and a wrongly installed wastewater heat exchanger did not function. Hot water circulation losses are considerable.
  • Skanska has higher heat use due to commissioning problems including metering errors and runtimes.
  • Stockholmshem has higher heat use due to commissioning problems including metering errors and adjustments. Wastewater heat exchangers were faulty at the time of the first review and one commercial property lacked meters. Measures to streamline and address flaws in ventilation and heating systems are ongoing. Property electricity use could have been reduced.

Brofästet

From the Brofästet phase onwards locally produced energy can no longer be credited. The weighting factor 2 for electrical heating remains. A special land allocation competition for plus-energy buildings was held in Brofästet, i.e., buildings that producer more energy than they consume over the course of a year.

Energy performance body Sveby’s estimate of hot water use increased 5 kWh/m² per year. Considerable focus was placed on hot water circulation and other system losses, as well as thermal bridges that have been shown to be extremely significant factors in buildings’ energy balance. Several developers have GEO-AHU with pre-heating of incoming air in AHUs and some chose to install wastewater heat exchangers. Half of the buildings in Brofästet have geothermal heat pumps installed and are connected to the district heating network.

Several buildings in Brofästet saw occupancy in 2020 and recorded values for first operational year are not available. The City of Stockholm also held meetings and shared experiences from Norra 2 to prevent mistakes and substandard monitoring. Recorded values one year after occupancy for remaining developers will be reported in 2021.

Diagram 3.11 Energy performance Brofästet, kWh/m² Atemp per year

 

  • Stockholmshem’s plus-energy buildings had a recorded, normalised, and adjusted energy performance of 32 kWh/m2 (factor 2- weighted for electrical heating). The buildings have a good form factor, high performance construction and technical installation parameters in combination with minimised distribution losses. The efficiency of solar cells is increased through recycling of excess heat from inverters that recharge boreholes and optimise geothermal heat pumps for hot water production in the summer. Good experience of wastewater heat exchangers and solar panels that performed better than projected. An energy co-ordinator was available throughout – from project planning to monitoring and a measurement plan that was drawn up at an early stage in the process. Management and monitoring of measurement was important as well as regular quality checks and an organization for monitoring from occupancy, with continuous monitoring meetings at least once a quarter. Favourable experiences with performance contract have provided improved opportunities to control key sub-systems.
  • Tobin Properties: has a powerful geothermal pump and high COP factor as well as an AHU with geothermal ventilation systems. This involves the pre-heating of outdoor air via boreholes as well as cooling of outdoor air in the summer.
  • Einar Mattsson 1: has complemented district heating with AHU ventilation system, electric post-heating units in apartments, an air heating solution, and wastewater heat exchangers. Bore holes for pre-heating air works well and solar panels on one of the buildings produces electricity but have not performed particularly impressively. This is likely due to substandard meters. Electrically powered comfort floor heating was not included in the calculations and wastewater heat exchangers have not worked. Einar Mattsson has reported a raft of shortcomings that need to be addressed during the 2020-2021 heating season. The target is to substantially reduce energy use. Measures include fine tuning and regulating as well as installing meters in appropriate places.
  • Besqab have two buildings with good building envelopes. Buildings are heated using district heating and the heating system is fitted with AHU systems for air treatment and heat recovery. Low U-values of building components considerably reduces heat loss. Parkhuset has reported slightly higher results in terms of as-built documentation. The deviation is marginal if the safety margin is discounted.

Differences between Stockholm Royal Seaport’s requirements and Swedish building code regulations

Energy performance is calculated differently in Stockholm Royal Seaport than in Swedish building code regulations (SBC). Under Swedish building code regulations, no weighting is applied and locally produced solar energy can be credited. These differences are especially pronounced in Brofästet where large amounts of solar energy production affects results, see table 3.7. Some developers fulfil Stockholm Royal Seaport’s requirements, but all developers meet Swedish building code regulations by a considerable margin. Stockholmshem’s plus-energy buildings recorded values of 12 kWh/m2 Atemp per year according to Swedish building code regulations.

Table 3.7

DevelopersSRS requirementsCalculated according to SRS requirements (weighting, solar energy not included)Requirements according to applicable Swedish building code regulationsCalculated according to SBC regulations (weighting, solar energy included)Heating type
DevelopersSRS requirementsCalculated according to SRS requirements (weighting, solar energy not included)Requirements according to applicable Swedish building code regulationsCalculated according to SBC regulations (weighting, solar energy included)Heating type
Stockholmshem55325012Heat pump
Tobin 155555034Heat pump
Tobin 255555033Heat pump
Einar Mattsson 155929084District heating
HSB55758073District heating
Besquab55659063District heating

Gasverket Västra

Gasverket includes buildings of cultural-historical value. The challenge is to balance these buildings’ historical significance with energy efficiency measures. To achieve this balance, the buildings were planned with well-insulated flooring and roofing and improved, energy-efficient windows and air handling units, AHU. New buildings are equipped with well-insulated and tight building envelopes with AHU. Energy is supplied by district heating and district cooling networks.

Diagram 3.12 Energy performance Gasverket Västra, kWh/m² Atemp per year

Comments:

Metered values are not reported, where several buildings have not been in use for more than two years.

  • The Real Estate Administration’s sports hall (newly-built) meets the passive building standard, (according to FEBY), with an energy-efficient building envelope and ventilation system with smart control.
  • SISAB’s Bobergskolan (newly-built) included high air surcharges but has significantly improved results compared to project planning.
  • Reconstruction of Vectura’s (existing building) pre-school reported an improvement of 79 per cent compared to original energy performance.
  • The Stockholm Transport Museum (existing building) reported an improvement in its energy performance of 75 per cent compared to the original building and an Um-value of 0.62 W/m²K, which almost meets the Swedish building code regulations for new buildings.
  • Klätterverket (existing building) improved energy use by 63 per cent compared to original energy performance. Measures implemented included additional insulation for ceilings, walls, windows, and floors, making the buildings more airtight, and an energy-efficient ventilation system with smart controls. The building is in use and continuous review is conducted with the City of Stockholm to establish appropriate monitoring routines.
  • In CA Fastigheter’s building 20 (existing building) building envelopes and ventilation system measures have been implemented have improved energy performance by 62 per cent compared to original energy performance. Buildings are in use and continuous review is conducted with the City of Stockholm to establish appropriate monitoring routines.
  • In CA Fastigheter’s building 8 and building10 (existing buildings) measures taken on buildings and fittings have improved original energy performance by 67 per cent.
  • The City Development Administration’s Gasklocka 2 (existing building) reported good energy performance at 62 kWh/m². Plans are being made for a building inside the existing building with a new energy-efficient building envelope and fittings.

Other
Jackproppen

The Real Estate Administration has built the highly insulated “Parklek” building (activity house at the playground) that includes a geothermal system, an AHU ventilation system, and solar panels on its roof. The building’s calculated energy use is 40 kWh/m² Atemp.


Värtaterminalen

For Värtaterminalen, the energy commitment was voluntary, and developers’ own data is not reviewed by the City of Stockholm, so results are not comparable with subsequent phases.

Värtaterminalen reported energy use of 62 kWh/m² Atemp, due to considerable cooling demand.
Cooling is largely done via boreholes and the facility has only been in operation for a short time. In addition, recharging may not have been sufficient due to the hot summer. Cooling requirement is also affected by users and how they control sun protection. As regards property energy, the metering structure is currently being investigated.


Södra Värtan

One of the requirements for the land allocation competition was to bring energy consumption down between 40 and 45 kWh/m² Atemp  net energy. Calculated values are generally below target levels, but the project is in its early stages, greater focus is placed on hot water circulation and other system losses. In Södra Värtan Norra, preliminary programme documentation has been submitted for Niam Hangö, 44 kWh/m² Atemp , and Niam Neapel, 38 kWh/m² Atemp.


Västra

The energy commitment was voluntary in Västra, and developers’ own data is not reviewed by the City of Stockholm, so results are not comparable with subsequent phases.

Because Västra uses voluntary agreements, the City of Stockholm compiled metered energy in the form of data from energy declaration two years after occupancy. Results are based on normal year corrected values. 110 kWh/m² Atemp represents applicable Swedish building code regulations.

Diagram 3.13 Energy performance Västra, kWh/m2 Atemp and year

 

  • Due to AHU, Einar Mattsson, Järntorget, and ByggVesta reported strong recorded values.
  • Svenska Bostäder’s (Söderåsen) high values are due to high hot water use because this is student housing resulting in a higher degree of occupancy than normal residential properties.

Norra 1

In Norra 1 the energy commitment was voluntary, and developers’ own data is not reviewed by the City of Stockholm, so results are not comparable with subsequent phases. Because Norra 1 uses voluntary agreements, the City of Stockholm compiled metered energy data in the form of data from energy declarations two years after occupancy. Results are based on normal year corrected values. 110 kWh/m² temp represents applicable Swedish building code regulations.

Reinhold Gustafsson used geothermal, AHU, and ground recharging with solar power collected in water piping on the building's green roof.

Diagram 3.14 Energy performance Norra 1, kWh/m² Atemp per year

 

Construction site sheds

From Norra 2 onwards, construction sheds were required to be energy-efficient and use electrical power; construction sites were also required to be environmentally certified.

Requirements for construction sheds:

  • Where possible, construction sheds must be heated by energy sources with a low primary energy factor. Electric heating is permitted if the requirement for purchased electricity does not exceed 4,000 kWh/year for office space and 5,000 kWh/year for staff sheds. Electricity used during the construction phase should be environmentally certified.

Diagram 3.15 Recorded energy use for construction sheds in Norra 2, kWh/year

Comments:

  • Bonava have not provided a reason for their high energy use.
  • Wallenstam’ housing and pre-school building had shared site.
  • HEBA, Skanska, and Stockholmshem have shared site.
  • Erik Wallin, Wallenstam, and Viktor Hanson did not have separate metering for office and staff quarters.

Diagram 3.16 Other: Recorded energy use for construction sheds in Brofästet, Jackproppen, etc., kWh/year

 

Comments:

  • Brofästet Besqab and Tobin Properties: energy use for construction sheds exceeded the requirement. The reasons for this are, however, unclear. Besqab installed a heat pump at the site to reduce energy use.
  • Jackproppen Parklek: energy use for construction sheds exceeded the requirement. It is unclear why the sheds used more energy, although it was probably due to heating and water heating.
Energy use in public open spaces
Vacuum waste collection system

The vacuum waste collection system has been made more efficient, but because the system is not yet fully operational it does not fulfil targets. Compared to previous years, energy use for residual waste and plastic was reduced, but increased for newspapers. To obtain cleaner fractions and pipes, the system has had to be emptied on multiple occasions, which has resulted in higher energy use.

Table 3.8 Energy use per tonne of waste from vacuum waste collection system

Målnivå / utfallRestavfallPlastTidningar
Target level / resultResidual wastePlasticNewspapers
Target, kWh/tonne 95300110
Result 2020, kWh/tonne100329347
Result 2019, kWh/tonne179453272
Result 2018, kWh/tonne140349249
Result 2017 kWh/tonne 113401250
Lighting

LEDs are used to illuminate public open spaces. Motion-detection lighting has been installed in certain areas where light levels are lower when pedestrian and bicycle paths are unused, switching to full brightness when someone is detected. This has resulted in cost and energy savings of between 30 and 50 per cent. In 2020, 147,500 kWh was used to illuminate Stockholm Royal Seaport.

Energy use during construction work

The City of Stockholm’s requirements include fuel, vehicles, and machinery. Energy used during construction represents a small proportion of total lifecycle energy use. Energy used in machinery is primarily from fossil fuels, and electricity is 100 per cent renewable. Diesel that is used is environmentally-labelled and in 2020, 268m3 of diesel was consumed and a total of 3,000m3 diesel has been consumed since 2013. Read more under fossil-free/public open spaces.

Comments:
In general, energy use is determined by what is demolished and the scale of the detailed development plan.

  • Extensive land remediation has been conducted since 2015 in Gasverket, which may explain slightly higher diesel use.
  • Land remediation of Gasklocka 3 and 4 was completed in November 2018. Demolition of the 90-metre high Gasklocka 4 was extensive and generated high levels of diesel and electricity use.
  • Västra and Ängsbotten have high diesel use for the construction of temporary streets due to poorer soil conditions.
  • High energy use by machinery during surfacing work in Norra 1 is due to the contractor handling large quantities of bulk materials. The same contractor carried out surfacing work in Norra 1, Västra and Norra 2 and thus the use of machinery was more efficient.
  • Kolkajen-Ropsten is a major detailed development plan on which work is still ongoing. Consequently, energy use to date is low. Work will continue in 2021. In-situ land remediation is underway and the new Lidingö bridge’s anchorage is being built.
  • Södra Värtan is a major detailed development plan and the figures shown in the table apply to a small contract that was started at the end of 2020 and which will run until the summer of 2021.
  • In Brofästet, work is underway on surfacing, which will be completed by the summer of 2021. At this point, work on public open spaces in Brofästet will be complete.
See how targets have been met
MålUppföljningsmått
TargetKPI
3.4 Efficient energy consumption in buildings and facilities

Experience feedback Norra 2 and Brofästet.
Metered (requirements 55 kWh/m2 per years Norra 2) = 70 kWh/m2 Atemp per year (purchased energy).
Average recorded energy use for dwellings in Norra 2 is 22% under applicable Swedish building code regulations.

3.5 Fossil-free by 2030

Fossil fuels contribute to greenhouse gas emissions. Stockholm Royal Seaport has a target of being fossil-free by 2030, which means that only renewable fuels can be used to supply energy to buildings and transport.

More than 70 per cent of the area’s buildings are connected to the district heating system and Stockholm Exergi works actively to replace fossil fuels with bio-based fuels at Värtaverket. To contribute to a fossil-free energy system, solar electricity or solar heat is produced on all buildings. Read more

Local production of renewable energy
Development sites

Requirements:

  • Production of 2 kWh/m² solar electricity or 6 kWh/m² solar heat or a combination of the two.
  • Norra 1 and Västra have voluntary commitments.

Energy production is presented in kWh/m² Atemp per year.

In 2020, 558 MWh was produced on roofs in completed phases. All developers from the Norra 2 phase onwards, generate solar energy locally and meet targets by installing solar equipment on the roofs of buildings. Solar panels produce electricity and solar collectors produce heat. A majority of developers have chosen to install solar panels, which explains the level of generation for solar collectors. Wallenstam supplies itself with electricity from new-build, regional wind power plants.

For Norra 2, Brofästet and Värtaterminalen, metered values are reported for local production of solar energy and for the remaining phases projected values are reported, see diagram 3.16. All developers except Wallenstam in Norra 2 produce solar energy locally. Wallenstam have instead renewable energy that comes from regional, newly-built wind turbines. Stockholmshem’s plus-energy building in the Brofästet phase has a positive impact on the phase’s results. Solar panels’ surface area on Jackproppen's playground roof is large in relation to the building’s total surface area which results in high per Atemp production. Developers are encouraged to ensure appropriate monitoring procedures with the correct installation of meters on solar systems.

Diagram 3.17 Average local production of solar energy per phase, kWh/m² Atemp per year

Local production of solar energy per phase and developers

Norra 2

All developers apart from SSM report good results on measured locally produced energy. Follow-up showed that monitoring routines need to be improved. Production in Norra 2 was higher than established targets probably due to developers having to include this in their energy calculation.

Diagram 3.18 Recorded local production of renewable energy in Norra 2kWh/m² Atemp per year

Comments:

  • SSM has its solar installation on Bonava’s building, but due to inadequate metering it was not possible to verify solar energy production.
  • Erik Wallin and Viktor Hanson have both solar panels and solar collectors.
  • Wallenstam’s renewable energy comes from newly-built wind turbines outside Stockholm that provide the building with property and household electricity. Only the property component is reported here.

Brofästet

Diagram 3.19 Planned production of solar energy in Brofästet kWh/m² Atemp per year 

Comments:

  • Stockholmshem have installed solar panels that produce 23 kWh/m², exceeding the projected 18 kWh/m². The solar system is optimised to maximise use of the sun.
  • Due to challenging conditions and locations, Åke Sundvall has been granted permission to install solar panels in future projects in Gasverket Östra.
  • Einar Mattsson and Tobin Properties are evaluating facilities that should deliver more energy according to projected values. HSB and Besqab metered solar energy production according to projected values.

Gasverket Västra

Diagram 3.20 Planned production of solar energy in Gasverket Västra (new-build) kWh/m² Atemp and year

Comments:

  • There are no solar panels on existing buildings in Gasverket to preserve the culturally significant buildings there.
  • SISAB’s Bobergsskolan, however, produces enough solar energy from its new buildings, for new and existing buildings.
  • The Real Estate Administration and Hjorthagshallen produces 3.3 kWh/m², exceeding the projected 2 kWh/m².

Other
Jackproppen

It is calculated that the Real Estate Administration playground building will produce 7.5 kWh/m² Atemp solar energy. It is calculated that Erik Wallin will produce 5.3 kWh/m² Atemp solar energy. Reported figures are based on preliminary programme documentation submitted in 2016. The project has been completed but the developer has not yet provided updated statistics.


Värtaterminalen

Värtaterminalen produces 3.5 kWh/m² Atemp solar energy.


Starkströmmen Elementica

It is calculated that Starkströmmen will produce 21.1 kWh/m² Atemp solar energy.


Södra Värtan Norra

Niam has estimated 2 kWh/m² Atemp solar energy in two projects, Hangö and Neapel.


Västra

Requirements in Västra are based on voluntary agreements and metered energy levels were reviewed by the City of Stockholm two years after occupancy. Four of eleven developers have local solar energy production. Only HSB in phase Västra has reported production of 2.5 kWh/m² Atemp.


Norra 1

Requirements in Norra 1 are based on voluntary agreements and reported energy use has been reviewed by the City of Stockholm two years after occupancy. One developer, Reinhold Gustavsson, generates energy locally, with a “soil heating system” that heats buildings with a geothermal pump via a number of boreholes. In summer, rock is “recharged” by the heat of the sun, which is collected in hot water piping under sedum plants on the roof of the building. Recharging increases the temperature of the rock, which means that the heat pumps operate more efficiently in the long term.

Public open space

In 2020, solar panels on the Mass Consolidation Centre’s produced approximately 243 MWh and meet the energy needs of the facility. They supply sorting machinery, lighting, the water purification facility and the ventilation system.

During the year, the Construction Consolidation Centre has installed solar panels capable of producing 43 MWh, which among other things will supply an electric truck that will be procured in 2021.

More than 1,500m² of solar panels on the roof of the Mass Consolidation Centre produce approximately 270MWh per year, making it one of Stockholm’s largest photovoltaic plants.

Towards a fossil-free construction site

There are currently two filling stations in Stockholm Royal Seaport that provide renewable diesel, HVO 100), on Södra Hamnvägen and Palermogatan. The filling stations make it easier for contractors to use fossil-free fuel and have also been opened for use by private individuals.

The use of fossil fuels for truck journeys in the City of Stockholm’s own contractors in Stockholm Royal Seaport decreased by 65 per cent on 2019, while the number of truck journeys made by the City of Stockholm’s own contractors doubled. The proportion of renewable fuel for truck journeys made by the City of Stockholm’s own contractors thus increased from 4 per cent in 2019 to 20 per cent in 2020. Renewables used by most contractors consisted of a low mixture of renewable fuel in fossil diesel, and the increase is believed to be due to a cut in national requirements on fuel suppliers. One in six ongoing contracts in 2020 used diesel with a high mixture of renewable fuels.

The proportion of renewable fuel use for machinery used by the City of Stockholm’s own contractors in Stockholm Royal Seaport was 2 per cent in 2019 and 2020. For most contractors, renewables consisted of a low mixture of renewable fuel in fossil diesel, this increase is also believed to be due to a cut in national requirements on fuel suppliers.

Electric truck

The Construction Consolidation Centre co-ordinates all transports to and from the construction area. Co-ordinating waste management has reduced the total transport requirement by about 50 per cent. One of the area’s sling trucks is now powered by electricity and is part of the “The view from the driver’s seat – what role do electric vehicles have to play?” innovation project. One of the aims of the project is to test energy storage systems in combination with an electric truck and solar panels and how charging infrastructure can optimise the electricity use of machinery and vehicles on construction sites. The R&D project is run by Ecoloop in collaboration with Vattenfall and with funding from the Swedish Energy Agency.

What residents think

According to the 2019 residents survey, 33 per cent of households have agreements to supply environmentally certified electricity.

See how targets have been met
MålUppföljningsmått
TargetKPI
3.5 Stockholm Royal Seaport to be fossil-free by 2030Development site: total produced solar energy: 558 MWh/year (metered)

Public open space, MCC: total produced solar energy: 243 MWh (year) (metered)

7% of the total number of street car parking spaces in public open space have electrical charging (carpooling) and a fast-charging station.

10% of car parking spaces on development sites have electrical charging. Requirements for electrical charging has increased to 50% of car parking spaces in future land allocations.

In 2020, the share of renewable fuel used for truck transports made by the City of Stockholm’s own contractors in Stockholm Royal Seaport amounted to 20% and 2% for machinery.

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3.6 Low climate impact

Development sites

During the design and construction phases, a substantial proportion of climate impact is determined by the materials used. All developers shall, at an early stage, make climate calculations for buildings.

To simplify the calculation methodology and increase comparability, Stockholm Royal Seaport participates in an innovation project, financed by the Swedish Energy Agency, to test and evaluate the construction sector’s environmental calculation tool. Because the development of Värtahamnen has been delayed, it was not possible to evaluate buildings as planned. Focus has therefore been placed on climate calculations for facilities, see below under Public open spaces.

The first three wood buildings in Stockholm Royal Seaport are planned in Kolkajen, with a total of approximately 290 homes.

Public open spaces

Climate calculations

The Swedish Environmental Research Institute’s calculation tool and the Swedish Construction Federation’s environmental calculation tool (BM) have continued to be tested at facilities. In 2020, a calculation was made of various solutions for the artificial island that is planned in Kolkajen. Results from these calculations were included as socio-economic costs in investment decision making.

Because BM has been developed for buildings, calculations were also made with the Swedish Transport Administration’s climate calculation, which is more suited to construction projects. Results differ between the two tools, but it is important to also consider the expansion of public space in relation to buildings. In 2021, therefore, discussions will continue to see how BM can be used.

To evaluate climate impact from built-in material on public open spaces, the supply of materials is collated from details of amounts, see table 3.9 below. Soil quality in Västra was worse and therefore more decking was used. Decking involves concrete and steel which have a substantial climate impact.

Table 3.9 Climate impact of built-in material per phase, public open spaces

AspektMängd, enhet Norra 1VästraNorra 2
AspectAmount, unitNorra 1VästraNorra 2
Amount of materialConcrete, tonnes15.20047.3562.705
Steel, tonnes1.0965.837358
Asphalt, tonnes3.3004.3943.347
Total, tonnes19.59657.5876.410
Tonnes/ m²2,687,681,28
Climate impact (tonnes CO2) Concrete, tonnes1.4304.455254
Steel, tonnes3201.704105
Asphalt, tonnes115153117
Total, tonnes1.8656.313476
Tonnes/ m²0,260,840,10

Reduced climate impact from construction work

By replacing vehicle fuels with renewables and avoiding transport in connection with the construction of public open space, emissions were reduced in 2020 by the equivalent of 1,240 tonnes of CO2e of which 450 tonnes of CO2e were due to increased use of HVO and 790 tonnes of CO2e due to local management and reuse of bulk materials, thereby avoiding unnecessary truck journeys.

Biochar that sequesters CO2

Most of the planted vegetation along the streets in the area are so-called rain gardens that are designed to receive and retain stormwater. The plant substrate consists of biochar-mixed macadam. The biochar comes from Stockholm garden waste and has favourable properties such as soil improvement and the fact that it sequesters CO2. By using biochar in Stockholm Royal Seaport, the project function as a carbon sink. The equivalent of 1,100 tonnes of CO2 have been sequestered to date.

See how targets have been met
MålUppföljningsmått
TargetKPI
3.6 Low climate impact from buildings and facilities from a lifecycle perspectiveAverage climate impact (public open spaces): Norra 1: 260 kg CO2e /, Västra 840 CO2e /, Norra 2 100 CO22e /.
Climate impact from energy use in Norra 2: Total amount is 1,640 tonnes CO2e , equivalent to approx. 248 kg CO22e /person.
Measures for a fossil-free workplace have contributed to reductions in emissions equivalent to 1,240 tonnes of CO2e in 2020.
Biochar used in plant beds in Stockholm Royal Seaport have sequestered 1,100 tonnes of CO2 to date.

”It makes no difference if energy requirements are tightened if they are not followed up. This is where Stockholm Royal Seaport is doing incredibly important detective work that we’re following with great interest,” says Birgitta Govén, Energy Expert at the Swedish Construction Confederation at a forum on sustainable solutions that focused on the theme “How we obtain energy performance that stands up to scrutiny” in February 2020.

Updated 2021-11-05