Cloud-based home energy management (HEM) startup EcoFactor is touting data from a new independent study showing that its system delivers significant energy savings for residential customers enrolled in Nevada utility NV Energy’s mPowered program. The analysis, conducted by ADM, found that in the summer of 2013, homes with EcoFactor-connected thermostats reduced electricity consumption by an average of 94.68 kWh per month, or 5.5%.
The study also showed that EcoFactor reduced peak load by 2.7 kW per thermostat, more than twice the load shed claimed by Google’s Nest Labs (1.18 kW per device) and 90 times the load shed Opower estimates it can achieve through its behavioral approach (0.044 kW).
It’s important to note that NV Energy’s mPowered program, which at that time had 14,500 participating customers, was (and still is) all EcoFactor – with no other competitors involved. So there is no head-to-head comparison with Nest devices, for instance, nor with Opower’s approach.
The closest comparison between EcoFactor and a competitor involved a Carrier two-way communicating thermostat for residential customers. In terms of per-device hourly reduction, EcoFactor’s thermostats came out on top, with a peak reduction of 2.37 kW. Carrier devices followed closely, at 2.33 kW.
EcoFactor’s approach is not limited to demand response (DR) events and electricity. By persistently working in the background (similar to Nest), it can also help a homeowner reduce natural gas consumption via the thermostat, as the study points out. The study’s authors calculated the expected natural gas savings from EcoFactor’s platform during months in Las Vegas when space heating would occur and found that they would amount to 18 therms per year. When combined with the cooling reductions, about 635 kWh, the expected annual savings for an EcoFactor home was about $98.
The Competition Reacts
In a blog post, Yoky Matsuoka, Nest Labs’ vice president of technology, responded, “If we take a look at the hottest days in Austin, Texas (where we did a study of Nest homes last year) and compare them to similarly hot days for EcoFactor customers in Nevada, Nest customers and EcoFactor customers both reduced their peak energy use by about 1.3 kW of energy.” This competition is healthy for the HEM sector.
It’s also helpful to contrast the EcoFactor-mPowered results with what Oklahoma Gas and Electric (OG&E) has reported from a similar smart thermostat-DR program called SmartHours. Using Energate thermostats and the Silver Spring Networks software platform, the average participating OG&E customer saved about $191, or approximately 15%, off an annual bill in 2012. That program has not undergone an independent study like NV Energy’s, but it shows that results can vary.
What this independent study of NV Energy’s programs shows is the need for common standards on which to evaluate HEM programs and devices, something we’ve pointed out in Navigant Research’s reports, Home Energy Management and Smart Thermostats. Standardizing the measurement process across more utilities will help eliminate some of the confusion around the data and give key stakeholders – utilities, HEM vendors, and residential customers – more insight into what really lowers energy consumption and costs.
Lauren Callaway co-authored this blog.