Demand Response and OpenADR for Lighting, Explained

If you install commercial lighting controls in California, demand response is no longer an optional feature. It is written into the energy code, and the way a lighting system proves it can shed load is through a standard called OpenADR. Here is what demand response and OpenADR actually are, what Title 24 requires, and which control systems Rock stocks that meet the requirement.

What demand response and automated demand response mean

Demand response is the practice of reducing electricity use during peak grid periods, usually in exchange for a lower rate or an incentive payment. Automated demand response, or Auto-DR, removes the manual step. The OpenADR Alliance defines it as fully automated signaling from a utility, grid operator, or other authorized entity that connects directly to a customer's end-use control systems. When the grid is stressed, the utility sends a signal and the building responds on its own, with no one walking around flipping switches.

For lighting, the response is usually a dimming step. As Lutron puts it in its own Title 24 guidance, demand response often involves lowering the intensity of lighting when a demand response signal is received. A utility typically sends that event through a demand response automation server, which reaches the building over OpenADR.

What OpenADR is

OpenADR, short for Open Automated Demand Response, is an open information-exchange standard for demand response signaling. The OpenADR Alliance describes it as a way to standardize the message format for Auto-DR so that price and reliability signals move in a uniform, interoperable way among utilities, grid operators, and building control systems. In plain terms, it is a common language so a utility's server and a building's lighting controller can understand each other without a custom integration for every pairing.

The standard uses two roles. A VTN, or Virtual Top Node, is the server that sends the signals, typically operated by or for the utility. A VEN, or Virtual End Node, is the client that receives them, which can be an energy management system, a lighting hub, or another end device inside the building. Your lighting control system, or a gateway attached to it, acts as the VEN.

There are two generations in the field. OpenADR 2.0, in its 2.0a and 2.0b profiles, is the widely deployed version and the one written into current code and utility programs. OpenADR 3.0 is a newer, simplified release built on RESTful APIs and JSON rather than the older XML framework. The Alliance is explicit that 3.0 complements rather than replaces 2.0, so 2.0b remains the profile most utilities and equipment reference today. Confirm which profile your utility program requires before you spec hardware.

What California Title 24 requires

California's Building Energy Efficiency Standards, Title 24 Part 6, fold demand response into the mandatory lighting-control requirements. Section 130.1(e) does not spell out the rule in place. It points to Section 110.12, which is where the demand-management requirements live.

Under Section 110.12, as published in the 2019 and 2022 standards on Energy Code Ace, a nonresidential building larger than 10,000 square feet must have lighting controls capable of reducing total installed lighting power by at least 15 percent in response to a demand response signal. Those controls must either be a certified OpenADR 2.0a or 2.0b Virtual End Node, or be certified by the manufacturer to respond automatically to OpenADR 2.0b signals, and they must communicate over one or more of Wi-Fi, ZigBee, BACnet, Ethernet, or hard-wiring. A separate line in the same section requires electronic message centers, meaning illuminated sign displays, to reduce power by at least 30 percent on a demand response signal.

Two cautions before you quote a number on a job. First, the exact applicability trigger and percentages are tied to the code cycle in force for your permit. The figures above are confirmed against the 2019 and 2022 references. Verify Section 110.12 for the specific code edition governing your project, since the 2025 update may adjust the threshold, the percentage, or the referenced OpenADR profile. Second, the 15 percent reduction is a floor, not a target for how the sequence should feel to occupants. A good design trims uniformly enough that the space stays usable.

Which lighting systems meet the requirement

Several control platforms Rock carries are built to satisfy this. Lutron states that its commercial systems, including Quantum, Athena, and the Vive wireless platform, can meet the OpenADR requirement in Title 24 Part 6, and that the Vive hub supports OpenADR natively with software version 1.9.7 or later. On the Wattstopper side, the Digital Lighting Management platform from Legrand offers the LMDR-VEN, a module that provides secure OpenADR 2.0b communication between the utility and the site and acts as the system's Virtual End Node. Acuity's nLight platform supports embedded automated demand response through an OpenADR 2.0a VEN, either licensed on the nECY controller or added as a separate nADR device.

Because demand response layers on top of the occupancy and daylighting controls the code already requires, the practical move is to choose a controls platform that handles all of it in one system rather than bolting on a separate demand response box. If you are still sorting out the base control requirements, our guides on commercial occupancy sensors and Title 24 daylighting controls cover the mandates that sit underneath demand response, and the ASHRAE 90.1 vs Title 24 comparison explains which code applies to your project.

Incentives and when demand response pays

Beyond compliance, the California utilities run programs that pay for demand response capability. Southern California Edison's Automated Demand Response program offers incentives to offset the purchase and installation cost of qualifying technology, with a multi-year enrollment commitment and eligibility tied to a minimum load, a commercial or industrial rate schedule, and an interval meter. Pacific Gas and Electric runs its own Automated Demand Response program with published incentives for business customers. If a project already needs OpenADR-capable controls for code, capturing the incentive is often just a matter of enrolling, so it is worth checking the local utility program during design rather than after.

Get demand-response-ready controls from Rock

Rock Lighting & Electric stocks the Lutron and Wattstopper control platforms that meet Title 24 demand response, at contractor pricing with nationwide shipping. Browse our Lutron and Wattstopper lines, and if you are speccing controls for a job with a demand response requirement, create a contractor account or send us your plans for a quote and we will match the system to the code path.

FAQ

Code requirements and product capabilities change. Verify Title 24 Section 110.12 for the code edition governing your project, and confirm OpenADR support against the manufacturer's current documentation before finalizing a design.