Smart energy monitoring and control for grocery & convenience stores
In a grocery store, refrigeration runs every hour of every day and is commonly 40 to 60% of the electricity bill. We make that energy visible circuit by circuit, optimise the refrigeration, and turn the same sensors into continuous HACCP cold-chain proof, with one monitoring and control stack.
Three forces converge on food retail
High prices, always-on refrigeration
Commercial electricity in Ireland is among the highest in the EU, and a grocery store's refrigeration runs 24/7/365 as the single largest load. There is no quiet period to soften a price rise, so energy is both a major cost and one of the few a store genuinely controls.
Margin squeeze across food retail
Convenience grocery runs on thin margins, with supplier, labour and occupancy costs all rising while customers resist higher shelf prices. With most costs fixed or climbing, controllable overheads like energy are where a store defends its margin without touching range or staffing.
Concentrated, addressable waste
Because refrigeration dominates the bill and runs continuously, it can provide concentrated opportunities. The site's own operating data determines which measures justify action.
Three pillars: cost, continuity, compliance
Cost & margin
"In a grocery store, refrigeration is half the bill, and most of the waste is invisible."
Refrigeration is typically 40 to 60% of a grocery store's electricity, and the largest losses hide in plain sight: open cases spilling cold into the aisle all night, systems holding a higher condensing pressure than Ireland's cool climate needs, defrosts firing on a timer rather than on demand, and door-frame anti-sweat heaters running around the clock. None of it shows up on a monthly bill, which only ever reports a single number for the whole store.
The levers are well understood once the data is visible. Floating head pressure, demand defrost, anti-sweat-heater control and night blinds are largely no- or low-capital, and sub-metering visibility alone is worth around 10% before any control change. Refrigeration optimisation typically removes a further 10 to 20% of refrigeration energy, and layered with lighting and HVAC measures a full programme can reach 20 to 30% of total energy cost, recovered from a budget line that would otherwise only rise.
Stock protection & continuity
"A failed compressor overnight isn't a maintenance ticket, it's a skip full of spoiled stock."
The same monitoring that cuts cost also protects the stock on the shelves. A single overnight freezer or rack failure can write off thousands of euro, and under manual checks it is usually found hours later on the morning round. Continuous monitoring watches every unit between checks and raises an alert the moment temperature, door state or compressor behaviour drifts, so the failure is a notification to act on rather than a loss to absorb.
That early warning also extends equipment life and cuts emergency call-outs: a condenser that needs cleaning or a gasket that has worn shows up as rising energy and temperature before it fails outright, so maintenance becomes planned rather than reactive.
Food safety & compliance
"Evidence on a screen, not a clipboard nobody filled in."
Cold-chain temperature control is a food-safety obligation under HACCP, and today it usually rests on someone walking round with a probe two or three times a day. Continuous, time-stamped logging on every chiller, freezer and cold room turns that into an automatic record against FSAI limits, with alerts the moment a unit drifts out of range. It is an evidence trail you can show, rather than a routine you have to swear was followed, and it closes the six-to-ten-hour overnight gap that manual checks leave open.
It also frees staff time. Replacing the manual round saves well over an hour a day, and the same data underpins building risk more broadly: leak sensors in plant areas and cold rooms catch a burst or a running tap within minutes rather than on the next water bill, when the store is least watched.
A modular monitoring and control stack
Each capability can stand on its own or form part of a phased scope. One possible starting point is refrigeration monitoring and cold-chain visibility, followed by refrigeration optimisation, HVAC and lighting control where the site evidence supports them.
Refrigeration sub-metering & fault detection
A multi-channel current-monitoring hub with CT clamps in the distribution board breaks the bill down circuit by circuit: the refrigeration pack, lighting, HVAC, the bakery or deli and the three-phase mains, all on the same hub. Refrigeration is commonly 40 to 60% of a grocery store's electricity and runs around the clock, so it is both the biggest load and the biggest blind spot. Pressure sensors on the pack add suction and discharge data for fault detection and floating-pressure control. Sub-metering turns a single monthly number into 'this circuit is drawing more than it should,' which is where the waste actually sits, and visibility alone is associated with around 10% savings before any control change.
Cold-chain & HACCP temperature assurance
Air and probe temperature sensors in every chiller, freezer and cold room, plus door-contact sensors, log a continuous, time-stamped record against FSAI limits (chilled at or below 5°C, frozen at -18°C or colder). The same layer that protects food safety also exposes energy waste: short-cycling, overcooling, condensers that need cleaning and doors left open. Alerts fire the moment a unit drifts, so a failing compressor overnight is a phone notification rather than a morning of spoiled stock, and the digital log is an audit-ready evidence trail that replaces the manual round two or three times a day.
Refrigeration optimisation & control
Once the data is visible, the levers are well understood. Floating (optimised) head pressure lets the system run at the lowest safe condensing pressure for Ireland's cool maritime climate, worth roughly 1% for every degree the condensing temperature falls. Demand defrost replaces fixed timers so cabinets defrost only when they need to, and anti-sweat-heater control cycles the door-frame heaters on dew point instead of running them 24/7. Smart relays draw night blinds and apply overnight setback on open cases. Each measure is largely no- or low-capital, and refrigeration optimisation typically removes a further 10 to 20% of refrigeration energy on top of the visibility gain.
HVAC & demand-controlled ventilation
Zone temperature, humidity and CO₂ sensors drive the heating, cooling and ventilation off real conditions rather than a fixed schedule. Demand-controlled ventilation modulates fresh-air supply to actual occupancy instead of running flat out all day, optimal-start control pre-conditions the store before opening, and unoccupied setback trims the plant out of hours. Where the refrigeration pack rejects heat, that heat can be reclaimed for space heating and hot water rather than burnt for separately. Demand-controlled ventilation alone is cited at 10 to 30% of HVAC energy.
Lighting, occupancy & footfall
LED retrofits with occupancy and daylight control in stockrooms, cold rooms, staff areas and near the frontage cut lighting energy and stop lights burning in empty space, and LEDs add less waste heat for the refrigeration and cooling to remove. At the front of house, privacy-safe people counting (motion and radar only, no cameras or audio) relates energy and trade to customers served, so opening-hours plant can be tuned to actual footfall rather than habit.
One dashboard: Optim EOS
Everything above feeds the Optim EOS dashboard, hosted in Ireland, with role-scoped views: the store manager sees refrigeration status and any cold-chain alert, while the owner sees the energy and cost picture across the site. It ingests the wireless sensors over the store's gateway and integrates existing controllers without ripping anything out. The same data is the food-safety evidence trail and the measured baseline that proves each saving before the next phase of work is committed. One screen for the whole store, not a drawer of disconnected controllers.
When monitoring proves the case for capital
Night blinds and doors on open cases
Open multideck cases lose cold to the aisle continuously, and most of that loss overnight is pure waste. Night blinds are a low-capital measure with strong independent evidence behind them, keeping products in temperature for hours after they are reopened. Retrofitting doors onto open multidecks is a larger step the sub-metered baseline can justify case by case, sizing the upgrade on what each cabinet actually loses rather than a blanket spend.
Refrigeration heat recovery
A refrigeration pack rejects a large amount of heat that is usually thrown away to the outside air. An air-to-water or pack-integrated heat-recovery unit captures it for space heating and hot water, displacing gas or electric heating at the full commercial rate. Efficient stores meet most of their heat demand this way. A sub-metered baseline sizes the system on real rejected-heat data rather than guesswork.
Rooftop solar PV
A grocery store's daytime trading can align well with solar generation and support a high self-consumption rate. Where relevant, the sub-metered baseline can size an array against real daytime load, much of which is refrigeration baseload. Potential SEAI solar support depends on the current scheme rules and project.
Sector benchmarks and an illustrative example
Published sector benchmarks help frame the opportunity. Each store's own bills, meter data, equipment and operating schedule determine the proposed scope, savings range and payback.
Refrigeration dominates the bill
Published sector benchmarks commonly place refrigeration at 40 to 60% of supermarket electricity consumption. Because it runs continuously, it is often the largest controllable load and a logical place to investigate.
Convenience formats run energy-intensive
Smaller and convenience-format stores show some of the highest energy intensities in food retail, with published electrical figures trending around 500 kWh/m²/yr and higher for the smallest formats, against roughly 250 to 400 kWh/m²/yr for larger, efficient stores. Energy per square metre is a useful first screen: well above ~450 kWh/m²/yr usually signals high savings headroom.
Irish electricity is among the most expensive in the EU
Eurostat placed Ireland's non-household electricity among the highest in the EU in late 2025 (around €0.2552/kWh), well above the EU average. Each avoided kilowatt-hour is therefore worth more here than in almost any other member state, which sharpens every refrigeration saving.
Optimisation and visibility effect
Refrigeration optimisation (floating head pressure, demand defrost, anti-sweat-heater control, night blinds and acting on monitoring insight) typically removes 10 to 20% of refrigeration energy, and sub-metering visibility alone is associated with around 10% before any control change.
Food safety pays as well as protects
Automated cold-chain monitoring removes the manual temperature round (well over an hour of staff time a day) and prevents overnight write-offs, with grocery refrigeration monitoring documented to save thousands of euro per store per year across spoilage, maintenance and labour combined.
Illustrative store (~€200,000/yr energy)
Applying the published benchmarks, a convenience grocery of this size could have roughly €40,000 to €60,000 a year of addressable energy waste at 20 to 30%, alongside food-safety labour and spoilage exposure. The store's own bills, meter data, installed price, ongoing service cost and confirmed support determine the actual business case.
Our four-step process
Independent evidence where needed
Where an independent professional energy audit is needed, we help coordinate the process and ensure its findings can inform practical system design and investment decisions. Potential SEAI support is checked against the current rules.
Tailored design and quote
A hardware and software specification matched to your distribution board, your refrigeration pack and cabinets and the priorities the audit surfaces, not a one-size-fits-all kit. Sized for a single store or designed to extend across a group.
Installation around trading
Wireless, battery-powered devices retrofit with no rewiring and no structural work, and one gateway covers the whole store. The team works around your trading hours and deliveries, so the tills and the chillers keep running.
Continuous monitoring & support
Baseline, then quarterly reviews, optimisation and ongoing upgrades, with the platform, alerts and firmware managed remotely. The data forms the HACCP evidence trail and the measured baseline for the next phase, or the next store.
Where the money may come from
Eligibility for each scheme depends on the business's profile, the project scope and SEAI's current programme rules. We help assess fit and apply where appropriate, and we do not promise grants we cannot deliver.
If controls, sub-metering or a building management system form part of the scope, read our practical guide to BMS grants in Ireland before ordering equipment or starting work.
SEAI Support Scheme for Energy Audits (SSEA)
May support an independent professional energy audit where the business and project meet the current scheme rules. Eligibility is checked before proceeding.
Triple E / Accelerated Capital Allowance (ACA)
Optim Energy includes Triple E and ACA treatment in project planning where relevant. Applicability depends on the qualifying equipment, customer and current SEAI and Revenue rules.
Local Enterprise Office Energy Efficiency Grant
May support eligible meters, controls and other efficiency measures for qualifying small enterprises following the required assessment route. Check the current LEO rules and support levels.
SEAI business energy upgrade supports
Capital support routes for automatic controls, building energy management, refrigeration, solar, heat pumps and fabric measures, including a BMS optimisation grant toward optimising an existing system that controls several services. Scope and rates depend on the current scheme rules and the project.
SEAI Non-Domestic Microgeneration Grant
Supports rooftop solar PV. Tapering annually toward elimination later this decade, so the value is highest for stores that act sooner.
SEAI EXEED Certified
Supports the engineering and project-management work on larger capital projects such as a refrigeration overhaul or a heat-recovery scheme.
Grocery & convenience FAQ
Will installing this disrupt trading?
Refrigeration is our biggest cost. What can monitoring actually change?
Does this help with food safety and HACCP?
We have open multideck cases. Are night blinds and door retrofits worth it?
Does SEAI fund this? Which scheme fits a convenience store?
Is this extra work for our staff?
Can you really catch an overnight refrigeration failure before we lose stock?
The case for a more efficient store starts with a measured baseline.
Start with your current operating picture. We will identify the most useful next step and coordinate independent professional assessment where it is needed.