Alternative Energy Solutions  |  Carbon Offsets  |  Carbon Offsets vs. Rooftop Solar

Carbon offsets vs. rooftop solar

Last updated 1/22/2018

Carbon offsets can help decrease your net greenhouse gas emissions, but if your primary goal is to benefit the environment, you should start by looking into actions that you can take to decrease your emissions directly. Many of these actions will not only benefit the environment, but also save you money.

Environmental benefits of carbon offsets and rooftop solar

The construction and operation of buildings contributes to roughly 39 percent of the carbon emissions produced in the United States. When you install rooftop solar, you take a major step towards reducing your own carbon emissions, rather than paying money for someone else to do it.

If your goal is “going green,” the benefit of rooftop solar over carbon offsets is that you’re making a direct impact on your property towards decreasing emissions. Installing solar is additional: you’re constructing a project that wouldn’t otherwise happen. It’s also real: you can directly measure the electricity your panels produce. Finally, it’s permanent: your solar panels will produce electricity for 30 years or more.

The electricity produced by your solar panel system is GHG emissions-free: solar power is clean, renewable energy. A 5 kilowatt system, which is around the average residential installation size in the United States, will produce roughly 150,000 kilowatt-hours (kWh) of emissions-free electricity in its lifetime. That’s equivalent to 103 metric tonnes of CO2 (...or purchasing 103 carbon offsets!). This number will continue to increase as efficiency of solar panel systems increase, and will be even higher if you install a larger solar panel system.

Economic benefits of carbon offsets and rooftop solar

A solar panel system isn’t free – just as with carbon offsets, you have to pay for your environmental benefits. However, solar is also a form of investment. When you install solar, you receive financial benefits (in the form of lower electricity costs) for 25 to 30 years.

Purchasing carbon offsets simply won’t save you money like solar can. While the overall cost of a solar panel system is going to be higher up front compared to carbon offsets, you’ll see savings over the lifetime of the system because of the avoided costs of paying for your electricity bill from the grid.

If you buy a solar panel system outright, your typical “break even” point (also known as your payback period) in the U.S. is probably between six and eight years. That being said, depending on how you finance your purchase, you could start seeing savings from day one – $0-down solar loans and solar leases are widely available for solar-interested homeowners.

Your overall savings from purchasing and installing a 5 kW system after 20 years can range from $7,000 to $30,000 (depending on your geography, the cost of the system and how much you pay for electricity). This number will be even higher if you install a larger system. The homeowners and businesses that benefit the most from solar electricity are those with the highest electricity bills.

Depending on your geography, there may be additional financial benefit to installing solar depending on incentives in your area. Some states have solar renewable energy certificate (SREC) markets that will provide additional income to homeowners who are producing solar electricity on their home. In many areas, there are also cash rebates or state tax credits available to help you install solar. Property owners across the U.S. are also eligible to claim the federal solar tax credit (ITC), worth 30 percent of the cost of the system if you own your system, regardless of the state you live in.

  Solar Carbon offsets
Cost Higher Lower
Savings Dependent on a number of factors, but thousands of dollars over the lifetime of the system No personal economic benefit to purchasing carbon offsets
Environmental benefits Clean energy, directly offsetting tonnes of CO2 throughout the lifetime of the system One offset is equivalent to offsetting one tonne of carbon dioxide equivalent
Criteria Considered additional, permanent, and direct Can meet this criteria, if certified by an industry partner
Renewable energy Yes Sometimes, but not always

If your home is not suitable for solar because of shade or lack of space, or if you don’t own your property, it’s a good idea to explore your community solar options. With community solar, you purchase solar electricity from an off-site solar energy system. As a result, you can benefit from solar panels at a remote location, and still save money on your electricity expenses. Your savings with a community solar option can vary depending on the type of arrangement (whether it’s a subscription model, framed like a power purchase agreement (PPA) or lease, or whether you’re actually purchasing the panels at a remote location).

Another option to consider before purchasing offsets to lower your carbon footprint is to schedule an energy audit and see if you can take steps at your home to decrease your electricity and gas spending through energy efficiency. Measures that may be recommended include installing new windows, insulating your attic, and replacing your light bulbs with LED lights.

Even after installing a solar panel system and implementing energy efficiency measures in your home, you can still have a positive carbon footprint. Carbon offsets can be a good way to take care of those additional emissions and lead you to being more carbon neutral. Even if you’ve already taken measures to neutralize your carbon emissions, purchasing them will still contribute to combating climate change as a whole throughout the atmosphere.

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