Customer
Unibet Arena, Tallinn – Estonia's largest indoor arena, hosting concerts, sports and conferences for thousands of visitors at a time.
Estonia · Venues & commercial buildings
Water and electricity, event by event.
Unibet Arena – Estonia's largest indoor arena – is putting its water and electricity meters on one in-building wM-Bus network, read every 15 minutes through Divako. Within two weeks of the first meters going live, the data pointed at potential leaks and the first fix was already done. The goal: know exactly what each concert, match and conference consumes.
15 min
reading interval · water and electricity alike
20+
Apator Ultrimis NEO water meters, more being added
2 weeks
from first readings to first potential leaks found
At a glance
The shape of the rollout
One radio network inside one building, carrying every kind of meter the arena adds – one technology at a time.
Network
wM-Bus throughout the building – two mains-powered Lobaro wM-Bus gateways with NB-IoT uplink see every meter, with no cabling and no dependency on the arena's IT network.
Meters
20+ Apator Ultrimis NEO ultrasonic water meters, plus the arena's electricity meters transmitting OMS telegrams over wM-Bus with security mode 5 – all decoded by Divako's device library.
Data
15-minute readings for water and electricity, leak and anomaly alarms, and the event calendar as the next dimension – consumption per concert, per match, per conference.
The challenge
A building that lives in events, metered once a month.
An arena's consumption is nothing like an office's. Water and electricity sit near idle for days, then spike for a few hours when ten thousand people arrive. A monthly meter reading flattens all of that into one number – useless for finding a leak, and useless for answering the question the operator actually has: what did this event cost us in water and power?
The brief was pragmatic. Start with water, where the leak risk is highest, and pick a network that could later carry electricity and whatever comes after – without rewiring a large building or running a separate system per meter type.
- Dozens of water meters spread through kitchens, bars, changing rooms and technical spaces
- Electricity meters from a different world – different vendor, different protocol
- Consumption tied to events, not to calendar months
- No appetite for cabling, and no dependency on the venue's IT network
What we built
One wM-Bus network, every meter type.
Inside a single building, wM-Bus is the right tool: short range is no limitation, the radio is standardised across water, heat and electricity meters, and the meters run for years on their own battery. Two Lobaro wM-Bus gateways, mains-powered and each with its own NB-IoT uplink, hear every meter in the arena and forward the telegrams to Divako – no cable pulls, no firewall tickets.
The water side runs on Apator Ultrimis NEO ultrasonic meters. The electricity meters were already transmitting OMS telegrams over wM-Bus, encrypted with security mode 5; Divako decodes them with the meters' keys and lands the readings in the same data model as the water. Both arrive every 15 minutes, with leak, backflow and anomaly detection on top.
- Apator Ultrimis NEO ultrasonic water meters – no moving parts, 16-year battery
- OMS electricity meters over wM-Bus, security mode 5 (AES-128), decoded natively
- Two mains-powered Lobaro gateways with NB-IoT uplink cover the whole building
- 15-minute readings for water and electricity in one data model
- Leak and anomaly alarms from day one; REST and MQTT APIs for the arena's own tools
Outcomes
What the first weeks showed
Leaks found in two weeks
Flow that never dropped to zero overnight showed up in the first 15-minute data. The potential leaks were flagged, and the first repair was done before the next invoice.
Electricity on the same network
No second system for the electricity meters. Their OMS telegrams ride the same wM-Bus gateways and land next to the water readings.
Events become the unit
With 15-minute resolution, a concert or a match is a clear block in the data. Consumption per event – water today, electricity next – is what the arena is building toward.
Room to add the next meter
The network is in place. Adding more water points, heat or sub-metering is a matter of registering the meter – one technology at a time, at the arena's pace.
"A venue this size doesn't need a bigger network – it needs one network that every meter can join. wM-Bus inside the building and NB-IoT out of it gave us 15-minute data on water and electricity without pulling a single cable."
More case studies
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Your building
Arena, campus or commercial site – we'll shape it.
Tell us how many meters, what kinds, and what you want to know about your consumption. We'll come back with a network design and a first plan.