--- title: "Public buildings and energy monitoring | Nexus Observatory" description: "Schools, libraries, offices and pools spend public money on energy and must keep people healthy inside. Meters, indoor air and comfort sensors and a weather…" url: https://observatory.global/industries/cities/public-buildings/ publisher: Nexus Observatory Inc. updated: 2026-11-02 --- [Nexus Observatory](https://observatory.global/) / [Cities](https://observatory.global/industries/cities/) / [Specialized fields](https://observatory.global/industries/cities/fields/) / **Public buildings and energy** # Public buildings, measured room by room. Schools, libraries, offices and pools spend public money on energy and must keep people healthy inside. Meters, indoor air and comfort sensors and a weather reference report to one record the energy manager, the facilities team and the head teacher can all read, behind a security gateway. [Plan a deployment](https://observatory.global/contact/deployment/) How it works [Station Builder](https://observatory.global/studio/builder/) **Industry**: Cities **Measurements**: 5 **Sources cited**: 6 1. Cities · Public buildings and energy Monthly bills hide the waste A city pays energy bills for hundreds of buildings and sees one number a month for each. Heating runs at night, a leak flows for weeks, a classroom fills with stale air. Measuring every meter and room shows where money and health are being lost. 2. What is measured Meters, rooms, plant and weather Meters on electricity, heat and water supplies read use at short intervals. Room sensors read carbon dioxide, temperature and humidity in classrooms and offices, plant is read from its controls, and a weather reference lets use be compared fairly across seasons. InstrumentsEnergy and water meters · Room air and comfort · Plant data · Outside weather 3. The base node A node behind the security gateway An industrial gateway reads meters and controls over their buses, and the building node normalises energy for weather and occupancy, detects waste and leaks and raises indoor air alerts per room. Everything leaves the building only through the security gateway. 4. Radio and links The building’s own network Most public buildings are on the city’s fibre or fixed broadband, the path for building data. Battery room sensors report over LoRaWAN without new cabling through historic walls, and where rooms have wireless, sensors join a separate network. Each building’s path is supervised. LinksFibre · LoRaWAN · Wi-Fi 5. How it works From a night-time meter to a fixed timer A school's heat meter keeps counting through the night. The building node compares it with the occupancy schedule, raises a waste alert to the facilities team, and a wrong timer is fixed. The next month's use falls, and the record shows the saving. 6. From order to operation · Order Scope the estate and the targets The scope reads the building list, energy bills, existing meters and controls, renovation plans and indoor air concerns. Nexus Observatory Inc. returns the meter and room plan by building, the network and security design, the integration with energy management and a price per building and per service. [Plan a deployment](https://observatory.global/contact/deployment/) 7. From order to operation · Survey Walk the plant rooms Crews walk each building with the facilities team: meters and plant rooms, representative rooms for indoor sensors, cable routes and network points. They record existing controls, their interfaces and who maintains them. They note access, opening hours and the people to call, so later visits do not disturb classes or services. 8. From order to operation · Permits Occupants, controls and security Head teachers and building managers agree to room sensors, and staff are told what is measured. Control system suppliers agree read-only access. The network design follows the industrial security standard, and every agreement is kept with the building's record. Data stays with the city. 9. From order to operation · Build Build per building Meters, room sensors, gateways and nodes are built, tested together and enrolled with their identities. Each building's configuration names its meters, rooms and plant, and every part is labelled with its building and room. Configurations are tested on the bench with each building’s meter list before installation. [Open the Station Builder](https://observatory.global/studio/builder/) 10. From order to operation · Install Install out of hours Crews install in holidays and evenings: meters on supplies, sensors in rooms at seated height away from windows and radiators, gateways in plant rooms and the security gateway at the network edge. Every point is photographed and located. Fixings respect listed fabric. 11. From order to operation · Commission Check against bills and references Each device proves its identity behind the security gateway. Meter totals are compared with utility bills, room sensors with a reference, and alerts are tested to the facilities team and the head teacher where agreed. Each building joins the record only when its checks pass. 12. From order to operation · Operate Find waste and fix rooms The energy manager sees use normalised for weather and occupancy, waste such as night heating and leaks, and savings from each measure. Facilities teams see rooms with poor air or comfort and fix ventilation. Every action is kept on the record. 13. From order to operation · Maintain Keep meters and rooms true Meters are checked against bills monthly, room sensors calibrated on schedule and batteries changed on plan. After renovations, baselines are reset. Every change is recorded, so savings can be shown year on year. Spares are kept ready, so a failed meter or sensor is swapped quickly. [Book field services](https://observatory.global/contact/field-service/) 14. Data products For energy managers and head teachers Energy managers receive use normalised by building; facilities teams receive waste and leak alerts; head teachers and building managers receive indoor air and comfort by room; city leadership and auditors receive performance reports. Each product carries its baseline and calibration. [See the data products](https://observatory.global/data-products/) 15. Evidence Savings you can audit Every reading, alert and action is signed and kept. Energy follows the management system standard's measured baselines, indoor conditions follow the European indoor environment standard, building performance follows the European directive, and the network follows the industrial security standard. Baselines are open to review. Drawn againstISO 50001 · EN 16798-1 · Directive (EU) 2024/1275 · IEC 62443 16. What you get Sensing as a Service Observation networks designed, installed, operated and maintained for a monthly fee: weather, hydromet, air, seismic and environmental stations, with data delivered under a licence. Delivered as managed service and data licence, for agencies, utilities, municipalities, insurers, agribusiness. Scale: Global, multi-site, per-site pricing. [Talk to sales](https://observatory.global/contact/sales-enquiry/) 17. Next step Plan public buildings and energy with us Tell us the site, the measurements and the rules it answers to. We reply with a survey proposal, a design and a scope for public buildings and energy. An engineer replies with a survey proposal and a scope, and the plan grows from one site to the network you need, at your pace. [Plan a deployment](https://observatory.global/contact/deployment/) [Open the Station Builder](https://observatory.global/studio/builder/) [Open the Studio](https://observatory.global/studio/) **01** The place and its hazards ## Where it runs, and what can go wrong. Operating contextCities own and run many buildings with old controls, monthly bills and little measurement. Building energy performance rules push renovation and monitoring, energy management standards ask for measured baselines, and indoor air in classrooms affects health and learning. Building controls are operational technology that must be kept secure. Hazards - Energy waste hidden in monthly bills - Poor indoor air in crowded classrooms - Overheating and cold rooms - Water leaks found late - Building controls exposed to cyber attack **02** What must be measured ## What, where, how often, and under which rules. Each measurement names where it is taken, how often, and the public standard or regulation behind it. Numbers in the sources column open the cited source below. | Measurement | Where | Cadence | Sources | | --- | --- | --- | --- | | Electricity, heat and water use | Main and sub-meters in each building | Continuous, at short intervals | 12 | | Indoor carbon dioxide, temperature and humidity | Classrooms, offices and meeting rooms | Continuous | 3 | | Outside weather | A rooftop station or the nearest reference | Continuous | 4 | | Plant performance | Boilers, heat pumps and ventilation units | Continuous | 1 | | Energy performance indicators | Each building and the estate | Monthly and yearly | 25 | **03** The observation stack ## From one base unit to a network. The same blocks at every scale: instruments and a base node, a site with its radio, a fleet run as one, and a network federated on the open protocol. 1. **01** Base unit A building point: meters and indoor sensors on an industrial gateway read by an edge node behind a security gateway. [Build a station →](https://observatory.global/studio/builder/) 2. **02** Site A building: every meter, room and plant item on its own network, linked to the city over fibre. [Plan a site →](https://observatory.global/contact/deployment/) 3. **03** Fleet Every building of the estate run as one fleet, with one energy record. [Managed offers →](https://observatory.global/industries/cities/solutions/) 4. **04** Network Cities, schools and energy agencies exchange energy and indoor data through open standards. [The open protocol →](https://observatory.global/protocol/) - **01** Energy and power-quality meter - **02** Air quality monitor - **03** Flow meter - **04** Compact weather station - **05** OT gateway (OPC UA, Modbus) - **06** Edge node (Wedge) - **07** Zero-trust gateway - **08** Fibre terminal Radio and links ### Fibre Most public buildings are on the city’s fibre or fixed broadband, the path for the building's data. Radio and links ### LoRaWAN Battery room sensors report without new cabling through historic walls. Radio and links ### Wi-Fi Where rooms already have wireless, sensors join a separate network for building data. Edge computeThe building node normalises energy for weather and occupancy, detects waste such as heating at night or leaks, raises indoor air alerts per room and keeps every control action read-only unless the facilities team allows otherwise. PowerMeters and gateways run on building power; room sensors on batteries for years. **04** How it works ## From the instrument to the product. One observation's path, tier by tier, with the interface on every link and a bill of materials below; then how the one node grows to a site, a fleet and federated networks. Public buildings and energy: data path – of 08 01 Instruments Measurement with sensor identity andcalibration 02 Gateway 03 Node – Wrap in an observation envelope with timequality– Measure quality and uncertainty, attachquality flags– Buffer locally (store-and-forward when thelink drops) 04 Local network 05 Backhaul Commit with transactional outbox andpublish, delivered at least once 06 Site Consumer inbox deduplicates and applieseach record once into governed data 07 Data store Governed product through API, map orexport, correction-aware 08 Products OPC UAModbusIEC 62443 01 Energy and power-quality meter SDI-12 · RS-485 · Ethernet 02 Air quality monitor SDI-12 · RS-485 · Ethernet 03 Flow meter SDI-12 · RS-485 · Ethernet 04 Compact weather station SDI-12 · RS-485 · Ethernet 05 OT gateway (OPC UA, Modbus) Ethernet · RS-485 · CAN · AnalogueI/O 06 Edge node (Wedge) Ethernet · Fibre · USB · RS-485 ·BMC 07 Zero-trust gateway Ethernet · Fibre 08 Fibre terminal Fibre · Ethernet Site MQTT 5 with Sparkplug B Governed data store Versioned, correction-aware Energy use normalised by building Waste and leak alerts Indoor air and comfort by room Energy performance reports RS-485 · Modbus RS-485 · Modbus RS-485 · Modbus RS-485 · Modbus Ethernet · opc-ua Ethernet Fibre Fibre From the instrument to the published product: each band is a tier, each connector names its interface, and the numbers match the bill of materials. Hover or focus a block to trace its path; scroll or step to follow one observation. | Item | Equipment | Data ports | Protocols | Power in | | --- | --- | --- | --- | --- | | 01 | **Energy and power-quality meter** Meter for voltage, current, power, energy and power quality at a site or on a feeder. | SDI-12RS-485Ethernet | Modbus, IEC 61850 (MMS, GOOSE), DNP3 (IEEE 1815), MQTT 5 | 12 V DC | | 02 | **Air quality monitor** Particulate and gas monitor (PM, NO2, O3, CO, SO2) for outdoor or indoor air. | SDI-12RS-485Ethernet | SDI-12, Modbus, MQTT 5, OGC SensorThings API | 12 V DC | | 03 | **Flow meter** Open-channel or pipe flow meter (Doppler, ultrasonic, electromagnetic). | SDI-12RS-485Ethernet | SDI-12, Modbus, MQTT 5, OGC SensorThings API | 12 V DC | | 04 | **Compact weather station** All-in-one or compact station for temperature, humidity, pressure, wind and rain at a site. | SDI-12RS-485Ethernet | SDI-12, Modbus, MQTT 5, OGC SensorThings API | 12 V DC | | 05 | **OT gateway (OPC UA, Modbus)** Read-only bridge from industrial fieldbuses and controllers (Modbus, OPC UA, DNP3, IEC 61850, CAN) to the site network, behind a security boundary. | EthernetRS-485CANAnalogue I/O | OPC UA, Modbus, DNP3 (IEEE 1815), IEC 61850 (MMS, GOOSE), MQTT 5 | 24 V DC | | 06 | **Edge node (Wedge)** Rugged edge node that boots from signed media, attests itself and establishes a site cell from little or no infrastructure. | EthernetFibreUSBRS-485BMC | MQTT 5, DMTF Redfish, IEEE 1588 PTP, NTP with NTS, OPC UA | 12 V DC, 24 V DC, 48 V DC, AC mains | | 07 | **Zero-trust gateway** Gateway that terminates encrypted tunnels, enforces segmentation and gates every flow by identity and policy. | EthernetFibre | — | 12 V DC, AC mains | | 08 | **Fibre terminal** Optical network terminal or media converter that lands fibre backhaul at a site. | FibreEthernet | IEEE 1588 PTP | 12 V DC, 48 V DC, AC mains | How it scales 01 Instruments Arbitrary qualified sensors and instruments whosemeasurements are ingested with calibration, units,geometry, time, custody and uncertainty. ×n 02 Node The minimum useful deployable unit: server, ruggedappliance, radio node, sensor gateway, satelliteterminal, AI, scientific, vehicle or virtual node. Node Node agent 03 Site The minimum independently operable localgovernance and failure domain: one or more nodesplus local network, identity, policy, evidence,storage, products and operator surfaces. SITE Node Node Node ×n 04 Cluster An optional scale or specialisation domain forscheduling, shared storage, accelerators or datalocality. CLUSTER ×n 05 Fleet Coordinates plans, acknowledgements,convergence evidence, update campaigns andcorrection propagation across nodes and sites. FLEET Fleet controller ×n 06 Federation An exchange of products, capabilities, events orwork across approved, independently administeredtrust domains, using explicit trust, policy,data-locality, version and correction contracts. TRUST DOMAIN TRUST DOMAIN TRUST DOMAIN ×n Verifier Applications Data in the field Telemetry Control Data upstream Control Data upstream Control Exchange Evidence Events Exchange The smallest deployable unit is one node; the same unit is replicated to meet the demand. Nodes form a site, sites may form a cluster, sites and clusters are coordinated as a fleet, and fleets exchange across independently administered trust domains. Each plane is a separate channel with its own open binding. **Data in the field**: MQTT 5 with Sparkplug B; connectors for LoRaWAN, OPC UA and instrument buses. **Telemetry**: OpenTelemetry OTLP. **Control**: TLS 1.3 with mutual authentication; protobuf messages over gRPC or HTTP/2. **Data upstream**: At-least-once publication with repeat-safe keys over the control channel or NATS JetStream; QUIC MAY be used on lossy links. **Evidence**: DSSE-signed in-toto statements; SLSA provenance; SCITT transparency receipts. **Events**: Event envelopes mapped to CloudEvents 1.0; channels described in AsyncAPI 3. **Exchange**: OpenAPI 3.1; the OGC API family; SensorThings; STAC; WIS 2.0. **05** From order to operation ## Every step, from the first call to a running site. The same crew and the same record carry the work from scope to maintenance. 1. 01 Order Scope the estate and the targets The scope reads the building list, energy bills, existing meters and controls, renovation plans and indoor air concerns. Nexus Observatory Inc. returns the meter and room plan by building, the network and security design, the integration with energy management and a price per building and per service. 12 2. 02 Survey Walk the plant rooms Crews walk each building with the facilities team: meters and plant rooms, representative rooms for indoor sensors, cable routes and network points. They record existing controls, their interfaces and who maintains them. They note access, opening hours and the people to call, so later visits do not disturb classes or services. 3. 03 Permits Occupants, controls and security Head teachers and building managers agree to room sensors, and staff are told what is measured. Control system suppliers agree read-only access. The network design follows the industrial security standard, and every agreement is kept with the building's record. Data stays with the city. 6 4. 04 Build Build per building Meters, room sensors, gateways and nodes are built, tested together and enrolled with their identities. Each building's configuration names its meters, rooms and plant, and every part is labelled with its building and room. Configurations are tested on the bench with each building’s meter list before installation. 5. 05 Install Install out of hours Crews install in holidays and evenings: meters on supplies, sensors in rooms at seated height away from windows and radiators, gateways in plant rooms and the security gateway at the network edge. Every point is photographed and located. Fixings respect listed fabric. 6. 06 Commission Check against bills and references Each device proves its identity behind the security gateway. Meter totals are compared with utility bills, room sensors with a reference, and alerts are tested to the facilities team and the head teacher where agreed. Each building joins the record only when its checks pass. 7. 07 Operate Find waste and fix rooms The energy manager sees use normalised for weather and occupancy, waste such as night heating and leaks, and savings from each measure. Facilities teams see rooms with poor air or comfort and fix ventilation. Every action is kept on the record. 3 8. 08 Maintain Keep meters and rooms true Meters are checked against bills monthly, room sensors calibrated on schedule and batteries changed on plan. After renovations, baselines are reset. Every change is recorded, so savings can be shown year on year. Spares are kept ready, so a failed meter or sensor is swapped quickly. **06** Data products and integration ## What it delivers, to whom, and into which systems. Data products - **Energy use normalised by building** Energy managers - **Waste and leak alerts** Facilities teams - **Indoor air and comfort by room** Head teachers and building managers - **Energy performance reports** City leadership and auditors Integration - **Energy management** Meter data and baselines feed the city's energy management system. - **Building controls** Controls are read over Modbus or OPC UA through the security gateway, read-only by default. - **Reporting** Indicators are exported for building performance and city reporting. Exchanged through OPC UA, Modbus, IEC 62443. **07** Questions buyers ask ## Before you scope it. Will it change our controls? Not by default. It reads them; any control action is a choice of the facilities team. Is it safe to connect controls? Every connection crosses a security gateway built to the industrial control security standard. Can teachers see classroom air? Yes, where the school agrees. How are savings shown? Use is normalised for weather and occupancy against a measured baseline. **08** Resources ## The sources behind this page. Public standards, regulations and guidance, cited where they apply. Each applies only where its jurisdiction or scope does. 1. **1** [ISO 50001: Energy management systems](https://www.iso.org/) International Organization for Standardization 2. **2** [Directive (EU) 2024/1275 on the energy performance of buildings](https://eur-lex.europa.eu/) European Union · 2024 3. **3** [EN 16798-1: Energy performance of buildings, indoor environmental input parameters](https://www.cencenelec.eu/) European Committee for Standardization 4. **4** [Guide to Instruments and Methods of Observation (WMO-No. 8)](https://library.wmo.int/) World Meteorological Organization 5. **5** [ISO 37120: Sustainable cities and communities, indicators for city services and quality of life](https://www.iso.org/) International Organization for Standardization 6. **6** [IEC 62443: Security for industrial automation and control systems](https://webstore.iec.ch/) International Electrotechnical Commission **09** Related ## Use cases and solutions. [Solution Sensing as a ServiceObservation networks designed, installed, operated and maintained for a monthly fee: weather, hydromet, air, seismic and environmental stations, with data delivered under a licence.Solutions for cities →](https://observatory.global/industries/cities/solutions/#sensing-service) [Solution Environmental exposure monitoring for health programmesHeat, air and water exposure measurements around facilities and communities; no diagnosis or treatment.Solutions for cities →](https://observatory.global/industries/cities/solutions/#exposure-monitoring) [Solution Operational-technology assurance for observing sitesIdentity, attestation, segmentation and monitoring for instruments and edge nodes, with evidence for audits.Solutions for cities →](https://observatory.global/industries/cities/solutions/#ot-site-assurance) **10** Cities: specialized fields ## Other fields of this industry. [Specialized field Urban air qualityReference stations and dense sensor networks for particles and gases, with weather to trace sources, calibrated against each other, on cellular and LoRaWAN, for street-level maps people can trust.The full field →](https://observatory.global/industries/cities/air-quality/) [Specialized field Urban heat and treesStreet-level temperature and humidity across neighbourhoods, tree soil moisture and heat-health alerts, on LoRaWAN across the city, so cooling and watering go where people suffer most.The full field →](https://observatory.global/industries/cities/urban-heat/) [Specialized field Streets and mobilityCounts of people, bikes and vehicles, speeds, kerb use and junction safety by camera and radar processed at the edge, on private 5G and fibre, so streets are planned on evidence and privacy is kept.The full field →](https://observatory.global/industries/cities/street-mobility/) [Specialized field Waste and street servicesBin fill levels, collection routes, transfer station gas and weather, on LoRaWAN across the city, so crews empty what is full and the waste record follows from the work.The full field →](https://observatory.global/industries/cities/waste-services/) [Specialized field Noise and the night-time cityClass 1 noise monitoring at hot spots, event classification at the edge for nightlife, construction and traffic, with weather, on cellular, so complaints are answered with evidence and noise plans work.The full field →](https://observatory.global/industries/cities/noise/) ### Bring us the site. 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