Out of the box, onto the meter
Blue Line Innovations has been marketing its Power Cost Monitor setup for years now, a simple device with an LCD (the Monitor) that wirelessly talks to a device that clamps onto your power meter (the Sensor) and displays real-time, peak, and average information about energy consumption. Of course, stat hounds want more, so enter the Gateway, a donut-shaped device that connects wirelessly both to the sensor and to the internet via WiFi to constantly beam information to Hohm.
Installation is easy -- well, relatively easy at least, compared to the circuit breaker dissection required when we tested out the TED 5000 last year. Unlike then we never felt that our life was at risk, nor did we consider spending the money to call an electrician. The sensor clamps onto your power meter and uses an optical pickup to monitor your usage. It takes a little finagling to get it right, somewhat tricky when it's pushing 100 degrees outside and you're swimming in humidity, but we had it up and running quickly and soon the gateway was blinking green and happy.
After that it was spikes and drops as... something pulled down power. Water heater? Refrigerator? Unfortunately the service won't help you figure out what. Other services, like those offered by TED, can detect what appliances are kicking on and when after you teach it what their consumption signature looks like. Hohm unfortunately can't do that, and Microsoft's Troy Batterberry explains that the intent is instead to offer an open platform that would allow devices to wirelessly submit their own usage data. That sounds ideal to us, but the problem is those appliances don't exist right now, and when they do come along we can't say we're going to be keen on buying them immediately anyway -- unless our ice cream maker happens to be on the fritz.
Right now Hohm also can't track electricity generated in your home, through solar or wind or that generator you attached to your stationary bike, but that feature is said to be coming in the not too distant future. A necessity that, we think, as those folks feeding power back to the grid are likely going to be the ones most interested in tracking exactly how many electrons are flowing and in which direction at any given time.
Finally, early talk of a dedicated Hohm apps for mobile devices have apparently been shelved in favor of the mobile version of the site, which we found to be useful and easy enough, but unfortunately lacking in some of the control allowed through the full site. However, that full site worked just fine on all the mobile browsers we tried it. It gives you (near) real-time usage as well as charts for various time intervals that show you how many watts you're pulling down, what your carbon footprint looks like, and even how many dollars per hour you're spending on electricity.
Which is the better option? For ease of installation and use we have to give it to the Power Cost Monitor -- if you don't have to do any bushwhacking to get to your meter, at least. The same goes for simply keeping track of your energy usage, as at the moment neither PowerMeter nor Hohm will knock you over the head with data like the TED 5000 can. Whether or not that's a good thing depends on your affinity for information.