August 3, 2010
Our third guest post is from science and environmental writer (and SunRun homeowner), Todd Neff. Learn how he and his neighbors are making a difference in the environment (and easing the strain on their utility grid) with their home solar systems. If you’re interested in contributing a guest post for our blog, send an email to nami@sunrunhome.com. We welcome all SunRun homeowners and solar enthusiasts!

As a Denver science and environment writer, I was well familiar with the benefits of rooftop solar. For me, those benefits were primarily environmental. Rooftop solar tends to follow the power demand curve – that is, its output is highest on those summer days that stress the power grid the most. Utilities pay top dollar for electrons on these June-July-August afternoons. Despite doing so, overloading from air conditioning demand blows transformers and substations. Neighborhoods and business districts go dark. Further, I’ve covered climate change extensively, and the benefits of substituting photovoltaic power for the coal-fired or even natural-gas-generated variety need little elaboration.
But man, was solar expensive. A neighbor installed a system and spent more than $14,000 up front, despite rebates covering more than half the cost. It’ll pay itself off in 15-20 years, even assuming modest utility rate increases. He owns the silicon and the inverters (he has two—it’s a big, 5.5 kilowatt system). It’s a beautiful system.
But 14 grand is beyond the possible for an obscure writer. I told him: One day I’m going to have solar panels, and I’m going to pour myself a cup of coffee, walk outside, look up at my roof and just bask in the knowledge that the stimulant in my hands was literally heated by the sun.
I was thinking it would take, like, a decade. Well, thanks to SunRun, it was less than a year. REC Solar is an installer representing SunRun in Colorado (I’m not sure if this is an exclusive arrangement). A neighbor came upon SunRun through REC. The neighbor is an entrepreneur with a PhD in biological engineering. He put SunRun through the wringer, trying to make sense of this leasing deal. He told me it checked out. He’s got a 4.4 kilowatt system now.
I had signed with SunRun before his panels were up. The system’s 2.86 kilowatts, limited by roof size and orientation. All morning, this baby’s drinking in Colorado sunshine and cranking out 2-2.5 kilowatts. It’s generating more than a kilowatt until probably 3 p.m., at which point it trickles to a nightlight’s worth of energy at dusk, and finally goes dormant for the night. I pay SunRun an average of 9.5 cents per kilowatt hour — $39 a month for 20 years. I own neither silicon nor inverter. Nor do I want to. It’s essentially a mortgage, but on an asset that generates a valuable commodity while preserving an even more valuable commodity—the environment we live in.
My SunRun neighbor and I are feeding Xcel probably 6 kilowatts during peak morning office air-conditioning hours – this saves the utility money. And, thanks to the state and federal rebates that figured into SunRun’s pricing, I am paying *less* per kilowatt hour for the 60 percent of the electricity I’m sourcing from my roof than I am from the stuff coming from the CO2-belching Comanche, Cherokee and other Xcel Energy coal plants supplying 70 percent of Colorado’s energy. This is not to vilify Xcel, which has become a progressive utility in the past half decade. I need power when the sun goes down, too.
SunRun is a company doing good. It deserves to do well, too, and, by all indications, it is doing well. It has enabled my small environmental contribution, and is somehow managing to make money for both of us while doing so. I firmly believe that leasing is the way solar should be done, and that a few years down the road SunRun will be recognized as a trailblazer in an established industry. So you may as well get on board now.