Since 1 January 2025, a commercial building whose HVAC exceeds 290 kW must have a BMS (building management system) capable of hourly monitoring by zone[1][1]RegulationLégifrance, “Décret n° 2020-887 du 20 juillet 2020” on building automation and control systems in non-residential buildings, BACS decree, Articles R175-1 et seq. of the French Construction and Housing Code (CCH)See in sources ↓. Your BMS therefore already does part of the monitoring. What must energy management software add to justify its cost? Rather than yet another ranking, we set out testable criteria: reliable data, useful real-time monitoring, weather-corrected consumption, reversibility and proof of savings.
Monitoring, reporting, alerts: what an EMS does and what regulations already require
Definition: collect, normalize, alert, report
An EMS, called energy management software or energy monitoring software depending on the vendor, collects consumption data: meters, BMS and bills. It normalizes them by heating degree days (HDD, called DJU in France), detects drifts, triggers alerts and produces the reporting. Vendors' definitions often leave out a decisive limit: the EMS does not act on the equipment. It informs the decision; the BMS executes it on the air handling units (AHUs) and valves.
The solutions on the market all promise to optimize usage, cut the bill or improve operations. None succeeds without reliable data collection: a badly metered use produces a false alert. Energy management refers to the continuous improvement approach, the energy management system (EnMS, called SMÉ in France), which the EMS provides tooling for.
EMS, EnMS, BMS, hypervisor: who measures, who acts, who aggregates
The BMS (called GTB in France), or building management system in English-language specifications, acts on the equipment. An EMS that does not write to the BMS remains a dashboard.
The hypervisor, for its part, aggregates several buildings and several BMS brands. GTE (gestion technique énergétique, technical energy management) is a common French synonym for the EMS.
Four families of software behind the same label
Under the EMS acronym coexist four families of software that do not meet the same need:
- bill tracking, based on the utility bill;
- meter-based monitoring, power monitoring and power quality;
- BMS supervision modules, limited to the equipped building;
- multi-site hypervision, the energy management software for enterprises used by real estate portfolios, such as Honeywell Forge or Schneider Electric's Resource Advisor.
Bill tracking is enough for annual carbon accounting, never for detecting a drift.
Five regulations versus an EMS: what it covers and what it leaves aside
The BACS decree (French decree 2020-887 on building automation and control systems), the Décret tertiaire (France's tertiary decree on energy savings in commercial buildings)[3][3]RegulationLégifrance, “Décret n° 2019-771 du 23 juillet 2019”, Décret tertiaire, annual reporting on OPERATSee in sources ↓, ISO 50001, the EED directive[4][4]RegulationOfficial Journal of the European Union, “Directive (EU) 2023/1791 on energy efficiency”, EED directiveSee in sources ↓ and the CEE energy-savings certificate sheet BAT-TH-116[5][5]RegulationFrench Ministry for the Ecological Transition, “CEE standardized operation sheet BAT-TH-116”, building management system, classes A or BSee in sources ↓ each govern part of consumption monitoring. The table below sets out, text by text, the scope, the deadline and what an EMS covers.
| Text | Scope | Deadline | What an EMS covers | What it does not cover |
|---|---|---|---|---|
| BACS decree No. 2020-887 [1] Mandatory |
Commercial buildings whose HVAC exceeds 290 kW, then 70 to 290 kW. | In force since 1 January 2025 above 290 kW. 1 January 2030 for 70 to 290 kW [6]. | Reading of trend logs, drift alerts, reporting. | The hourly monitoring by zone required of the BMS itself, detection of efficiency losses, interoperability, retention of data for five years at monthly intervals. |
| Décret tertiaire No. 2019-771 [3] Mandatory |
Commercial-use buildings within scope. | Annual reporting on OPERAT. Target of -40% in 2030 compared with the reference year. | Aggregation of annual consumption, preparation of the export. | The declaration itself, the choice of reference year, the target adjustment (modulation). |
| ISO 50001 [2] Voluntary |
Any organization, on a voluntary basis. | No regulatory deadline. | Monitoring of EnPIs and the energy baseline. | Energy policy, energy review, decisions on the action plan. |
| EED directive (EU) 2023/1791 [4] Mandatory |
Companies consuming more than 85 TJ per year. | Depending on national transposition. | EnMS monitoring data. | The EnMS itself. |
| CEE sheet BAT-TH-116 [5] Incentive |
BMS in existing commercial buildings. | None: financial incentive scheme. | Consumption monitoring after the works. | The class A or B required of the BMS. |
Only the BACS decree requires hourly monitoring of the BMS itself[1][1]RegulationLégifrance, “Décret n° 2020-887 du 20 juillet 2020” on building automation and control systems in non-residential buildings, BACS decree, Articles R175-1 et seq. of the French Construction and Housing Code (CCH)See in sources ↓. The EMS adds normalization and reporting, provided the BMS trend logs are usable. Another misreading: compliance is distinct from CEE eligibility, since the BAT-TH-116 sheet funds classes A or B[5][5]RegulationFrench Ministry for the Ecological Transition, “CEE standardized operation sheet BAT-TH-116”, building management system, classes A or BSee in sources ↓.
BACS decree: hourly monitoring by zone is already required of the BMS
The decree targets building automation and control systems (BACS), i.e. the BMS in the regulatory sense. It must monitor consumption by zone at hourly intervals, then retain this data for five years at monthly intervals[1][1]RegulationLégifrance, “Décret n° 2020-887 du 20 juillet 2020” on building automation and control systems in non-residential buildings, BACS decree, Articles R175-1 et seq. of the French Construction and Housing Code (CCH)See in sources ↓. Enforceable since 1 January 2025 above 290 kW, the obligation is postponed to 1 January 2030 at the latest between 70 and 290 kW, except for new buildings or when the heating or air-conditioning system is replaced before that date[6][6]RegulationLégifrance, “Décret n° 2025-1343 du 26 décembre 2025”, postponement of the 70-290 kW deadline to 1 January 2030See in sources ↓.
Did you know? The decree does not impose any class of NF EN ISO 52120-1[7][7]Standards and protocolsAFNOR, “NF EN ISO 52120-1”, French adoption of ISO 52120-1:2021, performance classes of building automation and control systemsSee in sources ↓: it sets its own functional requirements. The “class B minimum” reading comes from the market, not from the text.
The decree imposes hourly monitoring, not a class: an EMS that merely reproduces this monitoring makes you pay for it twice.
Décret tertiaire and OPERAT: the EMS prepares the declaration without guaranteeing it
The Décret tertiaire requires annual reporting on OPERAT (the French government platform for tertiary-decree declarations) and targets -40% consumption in 2030 compared with a reference year[3][3]RegulationLégifrance, “Décret n° 2019-771 du 23 juillet 2019”, Décret tertiaire, annual reporting on OPERATSee in sources ↓. The EMS prepares the declaration without guaranteeing it: it aggregates annual consumption by building. The choice of reference year and the target adjustment (modulation) remain with the declarant.
ISO 50001 and the EED directive: an EnMS tool is not the EnMS
The EnMS follows a PDCA cycle, to plan, do, check and act[2][2]Standards and protocolsISO, “ISO 50001:2018, Energy management systems”, revision of the 2011 editionSee in sources ↓: policy, energy review, significant energy uses, energy performance indicators (EnPIs, called IPÉ in French), energy baseline and action plan. The EMS provides the tooling to monitor EnPIs against the energy baseline. Policy, review and decisions remain human: an EnMS tool is not the EnMS.
Directive (EU) 2023/1791, known as the Energy Efficiency Directive, makes the EnMS mandatory for companies whose average annual consumption over the last three years exceeds 85 TJ, by 11 October 2027 at the latest[4][4]RegulationOfficial Journal of the European Union, “Directive (EU) 2023/1791 on energy efficiency”, EED directiveSee in sources ↓. It requires an approach, not a software subscription.
The features to check in energy management software and the data that feeds it
Data collection: meters, BMS and energy bills
An EMS feeds on three sources. The bill gives one month with several weeks' delay. Remotely read meters go down to one hour or 15 minutes, the territory of power monitoring. The BMS, for its part, only delivers what it actually logs. Data collection must therefore be assessed building by building.
Multi-utility and multi-site: do you need one software per utility?
No, because one software per utility makes comparison impossible. A multi-utility EMS covers electricity, gas, water and district heating and cooling networks in a single database. Across a portfolio, it requires each meter to be linked to its building and its use.
HDD normalization and baseline: comparing a mild winter with a cold one
If last January had more degree days than this one, a lower bill may come from the weather alone. HDD weather correction relates heating energy consumption to the month's heating degree days, then compares it with a baseline. Without it, energy monitoring compares winters, not performance.
Dashboards and real-time monitoring: useful to whom, and at what time step?
Real time monitoring serves whoever acts within the hour: the operator who triggers load shedding when peak demand approaches. For the real estate department, real time data is noise, because it decides on a corrected monthly trend. Serious monitoring software produces both views.
Alerts and drift detection: an alarm must lead to a decision
A threshold set too low floods the supervision system: after a few weeks, nobody reads the alarms any more. Energy drift then progresses silently, like the AHU that overconsumes as its filter clogs. Monitoring must say which deviation triggers which action.
Energy and carbon reporting: what sustainability reporting can produce
An EMS outputs tCO2e per building, an export to OPERAT and the EnMS indicators. This is the foundation of credible sustainability reporting: carbon accounting calculated on measured rather than estimated consumption. Consolidation platforms such as Microsoft Sustainability Manager go further on an ESG portfolio. Without clean data upstream, however, their reporting aggregates gaps.
Action plan tracking: linking each alert to a logged intervention
Too often, an alert is closed with nothing to say who intervened or how. A serious EMS links each action to a logged intervention and compares the following month's data. This track record separates an action plan from a wish list.
An EMS faithfully displays false data
Disconnections, gaps in trend logs, duplicate meters, meter readings never recalibrated since handover: the software corrects none of them, because its data management is limited to storing and then plotting.
An EMS faithfully displays false data.
The fault lies with data collection that nobody has tested point by point against the field.
Mapping between meters, zones and uses: the deliverable rarely handed over
A meter named “Main LV board feeder 12” does not say which use it measures. Without a correspondence table between meters, zones and uses, the EMS compares a lighting feeder with an HVAC feeder. The documented mapping is rarely delivered, yet it alone isolates significant energy uses.
Self-assessment: eight questions to ask your O&M contractor before signing
Before comparing software, look at what the data that will feed it is worth. The eight questions to ask your O&M contractor form a quick checklist, in which an “I don't know” counts as a no.
If your result calls for reliability work, the purchase decision can wait. Want to know what your meters are really worth? We test your trend logs point by point and hand you a data reliability plan.
Choosing energy management software on testable criteria, then deploying it site by site
Is there a best energy management software?
Not in absolute terms. The best energy management software is the one that digests the real data from your portfolio. English-language guides often end with a ranking. Capterra uses the criteria users rate most: ease of use, customer service and value for money[8][8]Studies and reportsCapterra, “Energy Management Software”, user review criteria: ease of use, customer service, value for moneySee in sources ↓. None of these criteria measures the reliability of your meters. An EMS specification based on your portfolio carries more weight.
How do you test an EMS before buying?
A demo shows clean curves on a showcase building. The real test is on one month of real data from your portfolio, imported before signing.
Can you change tools without losing the history?
Yes, if reversibility (the ability to take your data with you) was negotiated at signing and not at exit. Three points are checked in the contract: raw export at hourly intervals, an open format readable without the vendor, and contractual ownership of the data. A cloud based tool poses no problem as long as this export remains guaranteed.
What is a normal price for energy management software?
No price is a benchmark: think in total cost of ownership rather than advertised pricing. Four items make it up:
- the subscription, billed per building or per point;
- integration with the meters and the BMS;
- configuration of zones, thresholds and alerts;
- the human analysis time, every month.
The last item is the most underestimated: attractive pricing becomes expensive if nobody reads what the tool flags.
Is free software serious?
It can be, provided you know who funds it and what it does not do. The free model is often paid for elsewhere: a restricted export, reduced customer service or a price that climbs in the second year. Our analysis free vs paid EMS adds the vendor's lifespan.
Defining the scope: sites, utilities and significant energy uses
English-language guides describe setting up an EMS as a global project. In practice, deployment starts small: a few representative buildings, then the significant energy uses that weigh on the bill (HVAC, lighting, process). This installation in waves reveals metering problems on three buildings rather than fifty.
Setting the baseline and reference period before commissioning
The consumption baseline is set before commissioning, never after the first savings. The building owner establishes it on a full year of data, validated in writing with the O&M contractor. Postponing it opens the door to baselines adjusted after the fact.
Assigning alerts: O&M contractor, FM, energy manager, integrator
An alert without a named recipient ends up ignored. The chain must be written down: the O&M contractor acts on the equipment, the facility management (FM) manager decides. The energy manager consolidates the trends, the system integrator corrects the BMS programming.
The mistakes that turn an EMS into a forgotten dashboard
Nobody in-house owns the tool, so nobody sorts the alarms. They ring continuously, the O&M contractor stops looking and the monthly review stops in the third month. Without reliable data, every proposed action is debated instead of applied. The tool becomes a forgotten dashboard, paid for every month.
Measure, decide, act, prove: what an EMS really delivers
Cutting costs: the EMS points to the drift, the setpoint corrects it
An EMS does not lower any bill on its own: it points to the drift, the setpoint corrects it. Two levers stand out. The tariff lever acts on subscribed capacity and peak demand shaving, the consumption lever on setpoints, schedules and sequences. Each requires an action in the BMS.
Understanding consumption by use before chasing a single euro
You can only reduce what you can attribute. Before chasing euros, break energy consumption down by use: HVAC, lighting, process and the night and weekend consumption baseload. This baseload often tells the most: an empty building that consumes as much on Saturday as on a Tuesday signals a forgotten schedule.
Manual overrides, optimal start too early, drift: the waste an EMS brings to light
The most common waste does not come from a failure but from manual overrides set and then never lifted. The typical case remains the VIP complaint: the top-floor director who demands 24-25 °C all year round. Add to this optimal starts triggered too early to be on the safe side. No equipment alarm flags these deviations: this is where an EMS really helps reduce waste.
Where does the EMS stop in the measure, decide, act, prove chain?
Savings are built in four links: measure, decide, act, prove. The following diagram shows who holds each link and at what pace, and therefore the exact point where the EMS hands over.
The EMS holds the first link: measurement, alerts and reporting on hourly data[1][1]RegulationLégifrance, “Décret n° 2020-887 du 20 juillet 2020” on building automation and control systems in non-residential buildings, BACS decree, Articles R175-1 et seq. of the French Construction and Housing Code (CCH)See in sources ↓. The decision lies with the O&M contractor or the FM; the action goes through a modified setpoint in the BMS. That leaves the proof, which requires knowing how to read a promise of savings.
What Foobot does with the drifts an EMS flags
BMS advisory: making meters reliable before they feed an EMS
Our first reflex is not to add a tool. With BMS advisory, we go over the meters one by one: disconnections, data gaps, duplicates, invisible drifts and unexplained peaks. This work has value in itself, with no AI phase behind it: a reliable meter already makes an EMS readable and a declaration defensible.
AI Optimal Start: recalculating the start time zone by zone every day
An optimal start controlled at building level heats some zones too early and others too late. With AI Optimal Start, we recalculate every day the start time of each zone based on thermal inertia, weather (temperature and sunshine), occupancy and history. The action is still written into the existing BMS, with no works.
AI Control: writing setpoints to the BMS every 15 minutes
In a complex building, AI Control holds the “act” link of the diagram. We train a digital twin of the building on its BMS trend logs, the weather and occupancy. The AI then adjusts the HVAC setpoints every 15 minutes, 24/7, in the existing BMS.
Savings are measured against the baseline set before commissioning. The commitment lasts 12 months: the client stays out of satisfaction, not obligation.
An EMS is judged by what it lets you correct
An EMS is only worth two things: the quality of the data that feeds it and the setpoint it gets corrected. Before signing, test the software on your own trend logs, negotiate reversibility and name who will read each alert.
Our overview of platforms positions the families of tools relative to each other. The free Foobot EMS does neither portfolio ESG reporting nor multi-country. To start from your own meters, let's talk about your portfolio.
FAQ: your questions about EMS software
What is energy management?
A continuous improvement approach to energy efficiency, not software. The approach (the EnMS) relies on software (the EMS), which is only as good as its metering data. Policy, energy review, EnPIs and action plan are its components.
What is energy management software?
A monitoring tool, sometimes called an energy management platform, that collects consumption, normalizes it with HDD, detects drifts, triggers alerts and produces the reporting. It does not act on the equipment: the correction goes through the BMS.
Why is energy management software important?
Such software turns meter readings into usable trends, then into decisions. The tool prepares sustainability reporting and the OPERAT declaration. Its value depends on the reliability of the meters.
Who uses energy management software?
The real estate department uses it to make decisions, facility management teams to prioritize, the O&M contractor to intervene on the equipment. The energy or CSR manager, the tool's main user, consolidates the indicators. Each profile requires a different time step.
What types of industries use energy management software?
Every commercial building with HVAC: offices, hospitals, nursing homes and industrial sites. In real estate, property companies and property managers use it to monitor a multi-site portfolio. Needs differ mainly by portfolio size and metering quality.
What types of utilities are tracked and managed with energy management software?
Electricity, gas, water, district heating and cooling networks, often in a single multi-utility tool. Sources range from the monthly utility bill to hourly meters. Some tools add electrical power quality, mostly useful for industrial sites.
What are the key features of energy management software?
The basic energy management features: multi-source data collection, HDD weather correction, drift detection, assigned alerts, reporting and OPERAT export. Two criteria are decisive, however: writing to the BMS and data reversibility.
What Is the Best Way to Monitor Energy Usage?
Combine power monitoring from hourly meters with BMS trend logs, corrected for HDD. Real time energy monitoring serves the O&M contractor and peak shaving. The real estate department decides instead on corrected monthly trends.
How do I choose the best energy management software for my team and organization?
Test it on one month of real data from your portfolio, not on a demo. Ease of use, customer service and value for money come next, behind meter reliability, reversibility and writing to the BMS.
What is the best energy monitoring software?
None in absolute terms. The best energy monitoring software is the one that correctly processes the meters of your portfolio. Reviews rate customer service and ease of use[8][8]Studies and reportsCapterra, “Energy Management Software”, user review criteria: ease of use, customer service, value for moneySee in sources ↓, never the quality of your input data.
Why integrate EMS software into an ISO 50001 approach?
The standard requires monitoring of significant energy uses and EnPIs against an energy baseline[2][2]Standards and protocolsISO, “ISO 50001:2018, Energy management systems”, revision of the 2011 editionSee in sources ↓. The software provides the tooling for this measurement. Policy, energy review and action plan remain the organization's responsibility.
Does EMS software help comply with the Décret tertiaire?
Yes, to aggregate annual consumption and prepare the declaration on OPERAT. The -40% target for 2030 is calculated against a reference year[3][3]RegulationLégifrance, “Décret n° 2019-771 du 23 juillet 2019”, Décret tertiaire, annual reporting on OPERATSee in sources ↓. The choice of that year and the target adjustment (modulation) remain the declarant's responsibility.
Sources and references
8 sources.- [1]Légifrance, “Décret n° 2020-887 du 20 juillet 2020” on building automation and control systems in non-residential buildings, BACS decree, Articles R175-1 et seq. of the French Construction and Housing Code (CCH)20 July 2020↑ 1 2 3 4
- [3]Légifrance, “Décret n° 2019-771 du 23 juillet 2019”, Décret tertiaire, annual reporting on OPERAT23 July 2019↑ 1 2 3
- [4]Official Journal of the European Union, “Directive (EU) 2023/1791 on energy efficiency”, EED directiveSeptember 2023↑ 1 2
- [5]French Ministry for the Ecological Transition, “CEE standardized operation sheet BAT-TH-116”, building management system, classes A or B↑ 1 2
- [6]Légifrance, “Décret n° 2025-1343 du 26 décembre 2025”, postponement of the 70-290 kW deadline to 1 January 203026 December 2025↑