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Collaborating to improve energy efficiency on a construction site means agreeing targets early, connecting the right power supply, measuring the load and giving the site team controls they cannot easily override. A 2021 comment by Heather Bryant, Balfour Beatty’s group health, safety, environment and sustainability director, presented that approach through the company’s EcoNet compound-management system. The practical lessons are broader than that product: CITB guidance and a BAM case study show how grid planning, metering, efficient cabins, lighting controls and disciplined plant operation can cut fuel, carbon and cost.
The figures below are attributed to the organisations that reported them. Balfour Beatty’s EcoNet numbers come from a 28 October 2021 Building article, not an independent audit, and no later total was provided in the available evidence.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhat did the original “Collaborate to improve energy efficiency on site” article propose?
Bryant’s argument was that early supply-chain engagement is the route to practical decarbonisation: “It is clear for those who work within our industry that collaboration holds the key to a more sustainable future and ultimately a net zero world.” In the article, collaboration means the principal contractor, equipment partners, energy suppliers, subcontractors and site team sharing requirements and data before the compound is occupied.
The example was EcoNet, described as technology launched by Balfour Beatty with Sunbelt Rentals and Invisible Systems. It manages compound power rather than generating it. The article says it works by managing the supply to site-compound appliances, reducing output from equipment such as drying-room appliances and heaters when they are not in use. It also says the system was “autonomously regulating power consumption during times when demand is highest and when site compounds are fully occupied, diverting power away from traditional National Grid or diesel generator connections.” That description does not establish that EcoNet is a battery, solar array or replacement grid connection.
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What results did Balfour Beatty report for EcoNet?
The 2021 Building account reported that a trial on the East Leeds Orbital Route (ELOR) reduced site-compound carbon emissions by 83% by optimising heating, hot-water and external-lighting schedules. The article described ELOR as a highways contract involving 7km of outer ring roads around Leeds city centre. It then said the technology had been rolled out to 61 sites and would be used on new projects with six cabins or more.
The same article reported 11,000 tonnes of CO2 saved “since December”. It did not identify which December, provide a baseline, or publish an independent verification method. Treat all of these as Balfour Beatty’s 2021 company-reported figures, not as a universal saving rate for every site. The article also included a “39%” construction-emissions projection without naming a source, geography or year; it should not be reused as a statistic.
How can a site cut energy without a proprietary system?
A site can follow the sequence set out in the CITB Managing energy sheet and the Considerate Constructors Scheme’s BAM case study: set a measurable target, secure an efficient supply, appoint an owner, meter the main loads, then apply controls and review the data.
1. Set the target before mobilisation
Define the project period, energy boundary and reporting units. Include electricity, generator fuel, plant, accommodation, transport for materials and waste, business travel and offices where those are in the project’s control. Decide who receives the monthly report and what action follows an abnormal reading. CITB describes its sheet as guidance, not a substitute for current regulations, standards or legal advice.
2. Plan the supply and avoid unnecessary generator hours
Ask the electricity supplier and local distribution network operator about a connection as early as possible. Size it from a power plan covering cabins, plant, charging, heating and seasonal demand. BAM’s procedure uses the plan to improve the supplier’s load profile and select efficient equipment; CITB similarly recommends early connection to avoid generator use.
Where generation remains necessary, match capacity to the real load. BAM specifies generators for about 75% loading, and suggests separate day and night sets where one machine would otherwise run inefficiently at low load. A crane that needs generator support for short peaks should be sized for that peak while its average loading remains efficient. Gas or biodiesel and an uninterruptible supply for essential out-of-hours loads can be considered, subject to competent design and site rules.
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3. Give one person responsibility and install the right meters
Nominate an energy manager or named site-energy lead. BAM recommends remote or intelligent metering on main electricity and natural-gas supplies, with sub-metering on larger sites, monthly analysis and an online monitoring system. A plug-in monitor can reveal the draw of one heater or drying-room appliance, but it cannot replace a meter on the site incomer.
Use the baseline to separate working-hours and out-of-hours consumption, and annotate changes such as extra cabins, a winter wet-trades programme or a move from generators to grid power. Schedule at least one formal energy inspection early in the project and repeat it after a major change.
4. Specify efficient cabins and controlled heating
Request well-insulated cabins with effective lighting, heating and cooling controls, and ask the supplier for an EPC; BAM expresses a preference for A–C-rated cabins. Fit dehumidifiers in drying rooms, timers on heater circuits limited to working hours, and thermostats. The BAM case study states that reducing a thermostat by 1°C can cut heating bills by up to 10%; it does not identify an underlying study, so use that as a procedure rule rather than a guaranteed result.
Do not heat open or unenclosed areas, or rooms whose doors remain open. Avoid scheduling wet trades such as vinyl adhesive and screed in winter where programme flexibility allows. BAM recommends lower-wattage radiators instead of high-load electric fan heaters and says air-source heat pumps or gas-fired heating can be considered where suitable.
5. Make lighting automatic and proportionate
Use LED rather than tungsten lighting, zone circuits and keep emergency lighting and backup supplies on separate circuits. Add passive-infrared (PIR) detectors for security areas, photocells for external lighting and timers for non-emergency lighting. Keep safety lighting on an untimed output when a timed sub-distribution panel controls the main construction area.
Review manual and timer settings as daylight hours change, and appoint someone to make those adjustments. Where the layout permits, place sockets outside rooms and require subcontractors to bring task lighting; BAM specifies that task lights should not use tungsten bulbs. A competent electrician must design and install temporary electrics.
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6. Control plant, charging and deliveries
Ask plant hirers for efficiency data and match capacity to the job. Prefer electrically powered compressors where the supply allows, use inverter-driven soft-start cranes and hoists, avoid double-handling and never leave engines idling without an operational reason. Put large-battery charging for equipment such as MEWPs and pop-up units on a time clock so it does not create an uncontrolled overnight load.
Include switch-off expectations in induction and repeat them on signs. CITB also recommends delivery planning through consolidation centres or just-in-time deliveries, car-share and cycle schemes, and switching delivery-vehicle engines off while loading or unloading unless the vehicle’s equipment requires the engine to run.
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What does the Aintree case study show about controls?
The BAM Aintree Hospital project demonstrates why measurement and enforcement must work together. Automatic meter-reading (AMR) data showed that 52% of site energy was being used out of hours. Timers on heaters and zip boilers reduced that share only to 50%, partly because people changed the settings without permission.
BAM then installed a last-man-out switch that isolated non-essential electrical circuits while preserving critical supplies. The case study reports a 48% reduction in total consumption over the following six months, equal to 16,689 kWh compared with the preceding six months. It places the installed cost at about £1,900 and the potential annual saving at about £4,000. The report also compares the 16,689 kWh with the consumption of approximately four average UK households, without naming a household dataset. These are case-study figures, not a promise for another project.
Which intervention should a project choose first?
Choose by supply, visibility and control strength rather than treating a poster, a timer and an automated scheduler as equivalent.
| Intervention | What it changes | Limitation to check |
|---|---|---|
| Early, correctly sized grid connection | Replaces or reduces generator fuel and improves load planning | Connection timing, capacity and DNO requirements may constrain the programme |
| Main incomer AMR or intelligent meter | Shows total demand and out-of-hours patterns for monthly action | Needs an owner, reporting process and response to abnormal loads |
| LED, PIR and photocell controls | Reduces lighting hours and avoids daylight operation | Emergency and safety circuits must remain available |
| Heater timers and thermostats | Restricts heat to working hours and set temperatures | Users can override settings; inspect and lock controls where appropriate |
| Last-man-out isolation | Hard-isolates non-essential cabin circuits after the final person leaves | Critical IT, refrigeration and safety services need separate supplies |
| Autonomous compound scheduler | Automatically adjusts selected loads during occupancy and demand peaks | Confirm scope, baseline, data ownership and safety interfaces before claiming savings |
What should the energy section of a site induction cover?
Keep it short, visible and tied to the equipment people use:
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- Switch off lights, heaters, chargers, tools and plant when they are not required.
- Never idle engines without an operational need.
- Keep cabin doors closed and report faulty thermostats, timers or dehumidifiers.
- Use designated charging points and follow their time windows.
- Do not alter controlled timers or isolation equipment without authorisation.
- Report leaks, abnormal meter readings and equipment left running overnight.
- Explain who receives reports and how subcontractor accommodation is included.
CITB recommends practical devices such as LEDs, PIR sensors, timer switches and thermostats, but behaviour still matters. BAM’s Aintree experience shows that a control which occupants can casually defeat may deliver little until the electrical arrangement changes.
How does construction-site energy relate to BREEAM?
Temporary-compound savings, responsible-construction credits and operational-energy metering are separate mechanisms. Do not add an 83% compound reduction to a building’s BREEAM energy score.
BRE Global Guidance Note 54 for BREEAM V7 covers environmentally and socially responsible site management, including vehicle movement, pollution, tidiness, health and wellbeing, security, training and incident reporting. Its extracted checklist does not list EcoNet, LED lighting, compound energy or generator loading as separate requirements. The note states that, at publication, the Considerate Constructors Scheme is the mapped scheme; its 2026 scoring uses percentage scores and minimum pillar scores. Read the PDF’s table directly before relying on any threshold.
A different BREEAM Knowledge Base note for Home Quality Mark and UK New Construction Residential V6.1 discusses weekly monitoring of construction energy and water so teams can overlay data on the programme and target energy-intensive processes. That scheme-specific guidance is not GN54.
Finally, Ene 02 in the BREEAM UK New Construction technical manual 6.1.2 concerns operational energy in the completed building. One credit requires sub-metering that assigns at least 90% of estimated annual consumption for each fuel to end-use categories. Its principle—“You can’t manage what you do not measure”—supports site metering, but the credit is not for temporary welfare cabins. An Encon Associates guide says the energy category can represent up to 19% of the total score depending on project type; that is a consultant explanation, not a BRE weighting table.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should the collaboration be governed?
Put responsibilities in the project plan and contracts. The principal contractor should own the target, meter strategy and reporting cadence. The energy supplier and DNO should confirm connection capacity and timing. Plant and cabin suppliers should provide efficiency data, controls and operating instructions. Subcontractors should follow switch-off, charging and accommodation rules, including when they bring their own cabins. The person who can authorise an electrical change should be different from the person who merely observes a high reading, so findings lead to safe corrective action.
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At handover, separate temporary-site records from permanent-building records. CITB’s handover list includes checks on insulation, targeted airtightness, renewable-system commissioning, building services, meters, controls, maintenance and seasonal commissioning. Those checks apply to the completed building, not to welfare cabins; retain both sets of evidence without conflating them.
What are the common failure modes?
- Claiming a percentage without a baseline: record the period, weather, occupancy, programme and fuel boundary before comparing.
- Metering only a socket: use plug-in monitors for diagnosis, but AMR or intelligent metering for the main supply.
- Leaving one generator oversized: review load profiles and consider separate day and night sets.
- Allowing unrestricted overrides: use authorised controls and inspect after complaints or programme changes.
- Heating empty or open spaces: close doors, zone the supply and stop heating areas that cannot retain heat.
- Mixing BREEAM evidence: label construction monitoring, GN54 responsible management and Ene 02 operational metering separately.
- Ignoring a changed layout: repeat the energy inspection after adding cabins, moving accommodation or changing from generators to grid power.
The durable lesson from EcoNet, CITB and Aintree is not a single device. It is a repeatable partnership: agree the outcome, make the load visible, give someone authority to act, and verify the change against the same meter.
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Does EcoNet generate renewable electricity on a construction site?
The 2021 description identifies EcoNet as a compound power-management system that adjusts appliance demand. It does not describe solar generation, batteries or a replacement for the National Grid connection.
Can a plug-in energy monitor replace an AMR meter?
No. A plug-in monitor measures one socket or appliance, which is useful for troubleshooting. AMR or intelligent metering on the main supply is needed to see total site and out-of-hours consumption.
How often should a site review its energy controls?
BAM’s procedure calls for monthly analysis and at least one energy inspection per project, as early as practical. Repeat the inspection after changes such as extra cabins, a layout move or a switch from generators to grid power.
Are temporary-compound savings automatically BREEAM credits?
No. BREEAM’s operational Ene 02 credit concerns metering the completed building, while GN54 addresses responsible construction management. Some residential schemes separately use weekly construction-energy monitoring; the applicable scheme and version must be checked.
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