Just a few years in the past I began writing recurrently about electrical automobiles and the batteries that energy them—applied sciences which can be serving to humanity transition away from reliance on fossil fuels. And as dangerous information continued to pile up concerning the harms brought on by local weather change, I began to suppose tougher about my very own carbon footprint.
So final yr, my spouse and I acquired photo voltaic panels for our roof. Then we changed our air conditioner, getting a mannequin with a warmth pump functionality. Shortly after that, our boiler sprang a leak and we acquired a brand new high-efficiency boiler. Then we bought a battery electrical automotive.
We have not but achieved a carbon-free way of life. The new boiler burns pure fuel and we’re maintaining our outdated gasoline-powered automotive. We even have an oven and hearth that run on pure fuel. Still, our carbon emissions in 2021 can be far decrease than they had been in 2019. And we’re on a path to radically cut back our carbon emissions over the following decade.
Government insurance policies had been a giant assist right here. The federal authorities presents beneficiant incentives for the acquisition of photo voltaic panels and electrical autos. The District of Columbia, the place we reside, presents extra incentives for each. Not solely did these straight cut back our out-of-pocket prices, they’ve additionally helped producers obtain economies of scale that made these applied sciences inexpensive within the first place.
So I believed strolling by the expertise would possibly inform—and maybe encourage—others who may be contemplating taking an identical leap.
Rooftop photo voltaic
My inexperienced vitality odyssey began with photo voltaic panels. My spouse and I reside in a Washington DC row home with a gently-sloping, south-facing roof. With no tall bushes behind the home, it is supreme for producing energy all day lengthy.
In the spring of 2019, I acquired quotes from two photo voltaic firms. One firm needed $35,538 for a 8.5 kW system with 26 panels. The different agency quoted us $33,372 for a 8.64 kW system with 24 panels. In both case, we might get a 30 p.c federal tax credit score value greater than $10,000, bringing the online value under $25,000.
We determined to go together with the costlier vendor. The cheaper bidder needed to anchor the photo voltaic panels on to the roof, whereas the costlier proposal would droop the panels from beams mounted on the parapet partitions on both aspect. The first agency assured me that they may seal the roof up good as new, however the thought of reducing into the roof made me nervous.
Later, the successful contractor advised us that our roof was nearing the top of its life and would value extra to interchange after photo voltaic panels had been put in. So we determined to have them change our roof. Our chimney was additionally in dangerous form, so we had a distinct firm rebuild that. This added $17,482 to the price of the mission. We financed all of this—and the HVAC upgrades I’ll talk about shortly—with a house fairness mortgage.
The roof was put in in early August. The photo voltaic panels arrived in October. Then there was a month’s watch for Pepco to hook up the system to the electrical grid. Our system was lastly energetic in November 2019.
Solar panels solely generate energy within the daytime. So if we needed to construct a self-contained system, we’d have wanted to purchase batteries to retailer extra energy within the day and to be used at evening. But fortunately for us, DC legislation requires our electrical utility, Pepco, to do what’s often known as internet metering. When now we have extra energy, Pepco credit us at retail charges, successfully offering us with free vitality storage.
Our photo voltaic panels can pay for themselves in 5 years
In 13 months of operation, our system has generated greater than 11 MWh of energy, which our photo voltaic system’s web site estimates saved us $1,250. Our electrical payments replicate that. In the yr earlier than the photo voltaic panels had been put in, our electrical payments totaled $1,254. Over the next yr, we paid solely $72.
Still it will have taken greater than 20 years for the photo voltaic panels to pay for themselves based mostly solely on these electrical energy financial savings. Luckily, free electrical energy wasn’t the first profit for us.
Under DC legislation, Pepco should purchase a rising share of its electrical energy from renewable sources. Pepco can both generate renewable energy itself or purchase photo voltaic renewable vitality credit (SRECs) from third events like us.
Thanks to DC’s stringent inexperienced vitality necessities, SRECs within the district promote for greater than $400. Each SREC represents 1 MWh of electrical energy, so our photo voltaic panels generate about 10 SRECs per yr. Hence we will anticipate as a lot as $4,000 per yr in SREC earnings. So far we have gotten three quarterly funds totaling $3,647.
When you mix SREC revenues with our electrical energy financial savings, the photo voltaic panels are more likely to pay for themselves in about 5 years.
Americans outdoors of DC in all probability will not get such deal. Many states haven’t got an SREC program, and those that do have decrease SREC costs.
When we put in our photo voltaic panels in 2019, they had been eligible for a 30 p.c federal credit score. That determine dropped to 26 p.c for 2020. It was scheduled to drop to 22 p.c in 2021 and to zero in 2022. However, Congress simply handed laws to increase these deadlines by two years. So the 26 p.c credit score will now be out there by the top of 2022. Then it will fall to 22 p.c in 2023 and to zero after that.
On the opposite hand, the price of photo voltaic panels retains dropping. And some elements of the nation get extra solar than Washington DC. So for those who reside in one among America’s sunnier states, it’s possible you’ll discover that photo voltaic panels are funding even with little or no state assist. And regardless, it is good for the setting.
When we determined to interchange our air conditioner in early 2020, we weren’t eager about decreasing our carbon footprint. The condenser for our outdated air-con system was noisy and took up house in our tiny yard. As we made plans to place photo voltaic panels on our roof, we puzzled if we may put the condenser on the roof as nicely.
Our preliminary plan to do each on the identical time did not work out. But just a few months after the photo voltaic panels had been put in, I employed an organization to put in a brand new system on the roof, for the reason that outdated one was nearing the top of its life.
We determined to pay an additional $1,000 or so for a model that doubled as a warmth pump that would warmth our home in addition to cooling it. In complete, the air-con system—together with warmth pump functionality and crane rental—value $12,666. Buying the warmth pump doubtless makes us eligible for a $300 federal tax credit score in addition to a rebate from the District of Columbia.
Weeks after the brand new air conditioner was put in, the oil-fired boiler that feeds our radiators sprang a leak, making a puddle of water on the basement ground. I’d been desirous to eliminate that outdated boiler—and the large oil tank in our basement—for years. The leak accelerated our timetable. Rather than attempting to salvage our getting old boiler, we determined to interchange it. It was July, so we had loads of time to get a brand new one.
After researching the choices, we determined to get a high-efficiency condensing mannequin. We acquired a “combi” unit that doubles as a tankless water heater. It hangs on the wall and takes up dramatically much less house than our separate boiler and water heater had earlier than. It value $10,500. I acquired an $825 rebate from the District of Columbia and could also be eligible for a $150 federal tax credit score.
Conventional boilers waste warmth by sending loads of steam up the chimney. A condensing boiler, in distinction, cools down exhaust gases to show most of that steam again into water, extracting just a few additional proportion factors of warmth within the course of. These cooler, moister exhaust gases cannot go up a traditional chimney. Instead, condensing boilers use a plastic exhaust pipe that stands out of the aspect of the home—angled barely downward so the condensing water runs outdoors.