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You thought it through carefully. The quote was clear, the installation went smoothly, and your solar panel output matches exactly what was calculated beforehand. Yet when the annual statement arrived, it didn’t feel like the savings you expected. This is precisely the rebound effect with solar panels in action, a phenomenon many owners only discover after their first full year.
If this sounds familiar, you’re not alone, and nothing’s wrong with your installation.
The answer lies elsewhere: not in the technology, but in behavior.
Two possible explanations for the lower-than-expected savings
There are essentially two explainations why energy savings may fall short of expectations following the installation of solar panels. The first is technical: an underperforming system, incorrect sizing, or a fault that went unnoticed. The second is behavioural: there is a change in the way you use energy, without you realising it.
At Solinso, we rarely see the first explanation in the case of properly installed systems. The panels generate exactly what they are supposed to. The second explanation — the rebound effect with solar panels — turns out to be the actual reason much more often in practice.
What is the rebound effect with solar panels?
The rebound effect describes how people unconsciously start consuming more once they believe energy is “free” or covered. Once panels are on the roof, perception shifts: electricity no longer feels like something you pay for, but something you already own. The washing machine runs an extra cycle, the dishwasher goes on with a half load, the AC stays on a bit longer than before.
Nobody does this deliberately or irresponsibly. It’s a subtle mental shift that occurs in nearly everyone — and it explains exactly why actual savings on paper often turn out lower than the theoretical calculation predicted.
Jevons’ paradox: the rebound effect in a historical perspective
Notably, the solar panel rebound effect isn’t a new phenomenon. It’s a modern version of Jevons’ paradox, a principle described by British economist William Stanley Jevons back in the 19th century. Jevons observed that more efficient steam engines, which needed less coal per unit of work, didn’t lead to less coal consumption. On the contrary: because the engines became cheaper to operate, factories used them even more.
The same pattern now plays out in households with solar panels. Efficiency gains don’t automatically lead to lower consumption, because people adjust their behavior to the new, cheaper situation.
Moral licensing: the feeling of having a free pass
A second mechanism reinforces the solar panel rebound effect: moral licensing. This concept from behavioral psychology describes how people who have made a good, responsible choice unconsciously grant themselves a kind of free pass to be less restrained elsewhere.
With solar panels — often a significant and deliberate investment in sustainability — this effect is strong. The feeling of “I’ve already done something good” makes extra consumption feel psychologically lighter. A longer shower, an extra drying cycle, lights left on longer — it all feels less problematic, because “it’s coming from my own solar panels anyway.”
Listen to the (Dutch spoken) podcast ‘De Maffe Mensen’ on Moral Licensing
Have you noticed the rebound effect with your solar panels?
Here are a few signs that the rebound effect might be affecting you too:
- You run appliances more often, even when not full.
- You sometimes think: "doesn't matter, it's coming from the sun anyway."
- You monitor your consumption less actively than before installation.
- Rooms are kept warmer or cooler than before, "for comfort."
Preventing the rebound effect from solar panels: what can you do?
Awareness is key to limiting the rebound effect. Insight into your actual consumption — via your system’s monitoring app — keeps visible what you actually use versus what you generate. For customers who value return on investment as much as sustainability, this insight is just as important as the installation itself.
The technique worked; the human factor was the variable
Your solar panels did exactly what they promised. The rebound effect explains why the rest of the story lies in behavior — and with the right insight, that’s entirely within your control.
Curious how your consumption compares to your generation? Contact Solinso for a personal analysis of your system.
