One year into having our rooftop solar panels installed here in Portland Oregon, we’re living off the sun. That’s to say, we producing slightly more electricity than we’re using. Yippee! (The wonks among us call this achieving net zero.)
What’s the secret to living off the sun? The secret is to use electricity sparingly. Solar energy is created in real time, and therefore supplies a slow, modest trickle of energy. Coal, in contrast, took millions of years to form in the earth, and yet is our culture’s main source of electrical energy. That’s unfortunate, because burning coal and other fossil fuels is what’s driving climate change, also known as global warming.
How much electricity do we use while living off the sun’s energy? We only use 4,3000 kilowatts/year, while the average U.S. household uses 11,280 kilowatts/year. So we’re using about 38% of the national average. That was true back when we lived in a small home built in 1940, and has remained true since we moved three years ago to our current home of 2,250 square feet that was built (to good, modern energy code) in 2010.
Does my home literally have no electricity bill? We still get a bill, but we only pay the basic service charge that keeps us connected to the grid. That’s because our solar panels are feeding into the grid a little more electricity than we’re using. This set-up is called net metering.
Are we depriving ourselves by using 62% less electricity than the average household? I think we live a wonderful life. And I’ve never heard anybody term me a martyr. The main ways our lifestyle looks different from most U.S. households would probably be these:
How much did our solar panels cost? They cost $5,950 when we had them installed a year ago, and we’re getting that whole investment back in Oregon tax credits over four years. Unfortunately, those tax credits have been reduced since then.
What’s our payback period? Payback period refers to how long it takes for an investment to pay for itself. Our payback period on our solar investment is unusually short, much less than four years, due to Oregon’s good tax credits in 2012. But let’s say no tax credits are available as you’re considering solar panels. That means it’s only your reduced electricity bills that will pay you back for your solar investment. If you’re paying $1,200 annually for electricity, which many households do, and if you combine serious energy conservation with getting solar panels, your payback period for your solar investment could possibly be as little as five or six years.
What happens after the payback period is over? That’s when it really gets interesting, because then the solar owner’s/solar producer’s electricity is free, except for the basic monthly service charge. Twenty years worth of my household’s pre-solar electricity bills equals $9,278 — which equals the electricity bills we won’t be paying, since our solar panels are producing that electricity. Where else can you be practically guaranteed that much return on an investment?
Are we living off the grid? No, our electricity is hooked into our city’s electrical grid, like most urban folks with solar panels. So, I should clarify that we do still receive a monthly electricity bill, and we pay a basic service charge Being part of the grid means that the energy we produce with our solar panels goes into the general power supply, and the energy we use comes from that same general power supply. Off-the-gridders are usually in rural areas. I would love to hear from anyone living with off-the-grid solar in the comments section.
Were our solar panels made in China? No, we made a point of buying solar panels made in Oregon. We paid a bit extra for this. We consider it money well spent if we can help a fellow Oregonian have a job.
We can’t all get solar panels. So, what’s the main takeaway here? If you’re a renter, or condo owner, or your roof is old or is in permanent shade, solar panels probably aren’t an option for you. But energy conservation will still both save you money, and make you more resilient to climate change and extreme weather events. Whatever your average monthly bill is, set a goal of reducing it by a third. Treat electricity as if it’s precious, like gold, because someday in the future we may all need to be living off the sun and the slow, real-time energy that it produces.
Over to you. What is your favorite way to conserve electricity? Or, what do you find hardest about doing that?
- Alison Wiley, Diamond-Cut Life