What is an electrical power monitoring system (EPMS)?
An electrical power monitoring system (EPMS) meters the electrical distribution chain of a data center. It records current (amps), voltage (volts), power (watts), power factor, and energy (kWh) at every level of the chain, from the utility feed and transformers down to individual branch circuits and outlets.
With that data you know where the power is going, how much headroom each circuit has, and which ones are close to their breaker rating. Tenant billing, capacity planning, and overload prevention all depend on it.
Why do data centers need EPMS?
Without per-circuit power data, four things go wrong:
- Revenue leakage: a colocation operator billing on estimates instead of meter readings is leaving power unbilled.
- Capacity blind spots: without live circuit data you cannot tell how much headroom a panel really has, and an overloaded circuit announces itself when the breaker trips.
- Compliance gaps: the EU Energy Efficiency Directive 2023/1791 and DCOI both want metered energy data. Estimates do not qualify.
- Operational risk: an unmonitored circuit creeps toward its limit with no warning, and one breaker trip can cascade into more trips and a tenant outage.
EPMS vs DCIM: what is the difference?
The two overlap on power but cover different ground:
| Aspect | EPMS | DCIM |
|---|---|---|
| Focus | Electrical power distribution only | Full infrastructure (power, cooling, assets, network) |
| Data depth | Deep electrical metrics (harmonics, power quality) | Broad operational metrics across all systems |
| Typical users | Electrical engineers, facilities teams | IT ops, facilities, finance, management |
| Billing | Power metering data for manual billing | Automated billing with API integrations |
Aravolta does both in one platform, so you do not run two systems. Sub-second branch circuit monitoring sits next to asset management, network topology, GPU analytics, and compliance reporting.
Key EPMS capabilities for data centers
Branch circuit monitoring
Current, voltage, watts, and power factor on every circuit, polled at sub-second intervals. You see a circuit approaching its breaker rating before it trips.
Power quality analysis
Voltage sags, swells, harmonics, and power factor, so you can tell whether the power coming in is clean and spot equipment that is starting to misbehave.
Demand management
Peak demand over time, so you can size the utility contract, stay clear of demand charges, and know when the next capacity addition is due.
Energy cost allocation
Actual consumption metered per tenant, rack, or department, and invoices built from that instead of an estimate.
How Aravolta delivers EPMS capabilities
Aravolta's EPMS functions live inside its DCIM platform:
- Sub-second monitoring: every branch circuit polled at sub-second intervals over SNMPv3 and Modbus/TCP, with current, voltage, watts, and power factor recorded on each.
- Automated billing: tenant invoices generated from metered usage and pushed to your ERP or billing platform over a REST API.
- Tenant portals: a white-label portal where each tenant watches their own draw, sets their own alert thresholds, and pulls their own consumption reports.
- Existing hardware: any intelligent PDU, branch circuit monitor, or power meter that speaks SNMP or Modbus.
- Alerts: thresholds you set, with multi-stage escalation over SMS, email, Slack, or webhooks, or a ticket opened automatically in ServiceNow or Jira.
Frequently asked questions
What is EPMS for data centers?
An electrical power monitoring system (EPMS) meters the electrical distribution chain of a data center: current, voltage, watts, power factor, and energy at every level from the utility feed down to the individual branch circuit.
What is the difference between EPMS and DCIM?
EPMS covers electrical power only. DCIM covers the whole facility: assets, network, cooling, power, and compliance. Aravolta does both in one platform, with EPMS-grade power metering inside the DCIM.
Why do data centers need electrical power monitoring?
For metered tenant billing, capacity planning, compliance reporting, power quality, and catching overloaded circuits before the breaker trips. Without per-circuit metering you bill on estimates, and the gap between the estimate and the meter is revenue you never collect.
How does Aravolta handle electrical power monitoring?
Aravolta polls every branch circuit at sub-second intervals over SNMPv3 and Modbus/TCP, records current, voltage, watts, and power factor, generates tenant invoices from the metered usage, and alerts your team when a circuit is getting close to its limit.
What hardware does EPMS work with?
Intelligent PDUs, branch circuit monitors, power meters, and tap boxes from Schneider Electric, Eaton, Raritan, ServerTech, and others. Aravolta reads any device that speaks SNMPv3, Modbus/TCP, or Redfish.
Can EPMS help with energy cost allocation?
Yes. EPMS meters actual consumption per tenant, rack, or circuit, so the invoice is built from what the meter recorded instead of an estimate. The invoicing can be automated through API integrations with your ERP or billing platform.
Last updated: August 2025