In Part 1, we explored how ASHRAE 90.1 defines metering as a foundational strategy for energy efficiency. Now, we delve deeper into how to implement a submetering system that meets both regulatory requirements and long-term operational goals.
With the right design and technology, submetering can become a powerful driver of energy savings and building intelligence.
To comply with ASHRAE 90.1 Section 8.4.3, a metering system must meet several key requirements. These include accurate meters capable of capturing data in any time interval from 1 to 60 minutes. The typical interval is 15-minute. The metering system must have robust data storage for at least 36 months and the ability to generate and share energy consumption reports. In multi-tenant buildings, separate metering for tenants is also essential.
But compliance is only the beginning. The true power of a metering system lies in its ability to inform decision-making. A high-quality submetering system should be capable of measuring electricity, water, gas, or thermal energy across many areas of the building and within tenant spaces. Integration with existing Building Automation Systems (BAS) or energy management systems enables automation, alerts, and data visualization.
Buildings that deploy submetering systems report significant improvements in both energy and cost efficiency. According to data from energy management firms, submetering can reduce overall consumption by identifying operational anomalies and correcting them in real-time. Examples include malfunctioning HVAC equipment, heat traces energized in the summer, excessive plug loads, or misconfigured lighting schedules.
Moreover, submeters provide the transparency needed for accurate tenant billing and utility cost recovery. This is particularly important in mixed-use or multi-tenant buildings, where shared utility costs can lead to disputes if proper cost allocation is not in place. By ensuring that each tenant pays only for what they consume, building owners foster trust and encourage energy-conscious behavior.
Submetering also plays a crucial role in demand management. Many utilities apply demand charges based on peak usage within a billing cycle. With real-time submetering data, facilities can stagger equipment starts and operations to avoid these peaks, significantly lowering their utility bills. In cases where EV charging is added, a properly managed system, will reduce the overall KWH cost, by maintaining the consumption under the maximum allowable demand.
A modern submetering system is not just a collection of devices—it’s a smart network. The most effective systems combine local access with cloud-based dashboards, mobile apps, and API integrations to provide seamless access to data. Communication protocols like Modbus RS-485, BACnet, and Ethernet ensure compatibility with multiple meters and various platforms.
Advanced features, including remote monitoring, alarm notifications, graphical data representation, and customizable reports, empower facility managers to take control of building performance from anywhere. These capabilities are essential for meeting not only ASHRAE 90.1 requirements but also broader sustainability, tenant satisfaction, and operational efficiency goals.
At Intellimeter, we understand that every building is unique. Our product line includes highly accurate submeters for electricity, water, gas, and thermal energy. We offer customizable systems that integrate easily with your existing infrastructure, whether you’re building from the ground up or retrofitting an older facility.
Our systems are designed with compliance, transparency, and ease of use in mind. With Intellimeter, you get more than just a product—you get a strategic partner in energy management. From planning and installation to training and support, we help ensure your submetering system delivers measurable results.
CONCLUSION
Designing a submetering system that complies with ASHRAE 90.1 is about more than meeting code—it’s about building a smarter, more efficient future. With the right tools, building owners and operators can gain actionable insights, reduce waste, and unlock significant savings.
Submetering is no longer optional for high-performance buildings. It’s a necessity. And with Intellimeter by your side, you're equipped to turn energy data into energy success.