Southern California Edison is regulated by the California Public Utilities Commission, which mandated SCE and the other two IOUs in the state to implement smart metering programs.
SCE responded by creating an advanced meter infrastructure project called Edison SmartConnect, which will replace approximately 5 million electric meters for residential and commercial customers below 200 kilowatts in demand with “next generation” smart meters by the end of 2012.
“The goal is an infrastructure that will enable utility companies to partner with their customers to lower peak demands,” explains David Erickson, director of IT and Business Integration, Edison SmartConnect. “We can do this by providing information and data to customers that they have never had before.”
For example, residential and commercial customers will be able to see their usage in 15-minute and hourly increments, respectively, and can see usage patterns. The system will also be able to provide customers with time-of-use peak and off-peak rates.
“Customers can sign up for us to turn off their air conditioning during certain events and receive incentives,” he adds.
The System
Each morning at 8 a.m., customers who are “hooked up” can see their usage for the time period of the previous midnight and back. This provides them with 720 reads per month (24 daily reads x 30 days), rather than the traditional one they receive with their monthly bills.
Getting the system up and running has been and continues to pose challenges. SCE has a 50,000 square-mile service territory, with 14 million customers and 5 million actual accounts. “We will have smart meters in all five million accounts,” reports Erickson.
As can be imagined, a lot of logistics has been involved in developing the Edison SmartConnect program, from the initial planning of how SCE was going to deploy the meters to how it would stage warehousing activities, as well as how it would strategically work through its service territory, district by district.
“We are replacing about approximately 6,500 meters a day,” states Erickson. “However, there have been days where we replaced 10,000 and even 12,000 meters.” Between September 2009 and April 2011, SCE has deployed about 2.5 million meters. It will have the remaining meters deployed by the end of 2012.
The Technology
Besides the logistical considerations, there is also the technical systems infrastructure to consider. This involves collecting, processing, validating, loading, and storing of data, so customers can access the information to use for energy management purposes, and so SCE can access it for billing purposes. The technology includes a Network Management System (NMS), a Meter Data Management (MDM) system, and the smart meters themselves.
The NMS collects the data from the meters, communicating with them using a local area mesh network that feeds up into a cellular network. “We send a command to the meter to request usage data,” he states. “The meter sends the data back through the network.” It then goes to a cell tower, and from there comes back to SCE’s data computer center, where the NMS receives the data from all the meters.
SCE sends the commands out about 1 a.m. each morning to all meters. However, the information comes back at different times. About 50% are back by 2 a.m., and 99.9% are back by 6 a.m.
The NMS then passes the information on to the MDM, which takes the interval data and makes sure the information is valid. “If we don’t get data back from certain meters, we estimate the gaps in the interval data,” he explains. For each account, SCE will correlate the data and run it against the rate that it has for each customer. This will provide the determinant to create the bill. This data is then passed back to SCE’s legacy mainframe billing system that it has had for many years. The billing system then creates the bill.
Once the data is validated by the MDM, it is also sent to the data warehouse. “We have a separate system and we store it in the data warehouse,” states Erickson. As a result, when customers log onto the SCE website at 8 a.m. they can directly access SCE’s data warehouse to view their usage.
The MDM also allows SCE to remotely turn service on and turn off, instead of having to send a field service rep out to do so. “This takes about eight seconds,” he reports.
Interval Billing
A key element of Edison SmartConnect is interval billing. “Interval billing is driven by the MDM,” explains Erickson. “The complexity of this begins with the business requirements that we had to satisfy with our system to provide the capabilities we wanted.” SCE had about 2,500 specific internal business requirements, which translated into over 5,000 system requirements. This translated into about 2,000 test scripts and about 7,000 test conditions. “We also did ‘performance of scale’ testing,” he continues. “These systems are built for certain throughputs and thresholds by the vendors. However, we wanted to make sure they would perform with the numbers we needed – five million meters. We didn’t want to make an investment like this and find out down the road that there would be problems that would prevent us from doing more metering or billing.”
SCE began testing the interval billing in January 2010 and began implementation in October 2010. Currently, SCE has about 150,000 accounts that are part of the interval billing program. “By late summer, we expect about one million customers to be getting their bills with interval billing,” he states. “I will talk a lot more about this testing during the Utilimetrics webcast May 4.”
Benefits
Obviously, the most important benefit of Edison SmartConnect will be the ability to reduce peak demand requirements. “It will also help us with the interface between smart meters and the outage management system, which we will be starting in June 2011,” states Erickson.
Furthermore, it will help SCE prepare for the future implementation of “home area network” technology, which will allow customers to have in-home digital displays for energy management and will tie into the smart meters and programmable thermostats.
Join Erickson Wednesday, May 4 at 12:30 p.m. Central for a webcast on Edison SmartConnect’s Meter Data Management System. Click here to register or for more information. The webcast is free for Utilimetrics members.