Connecticut and the 1 Kilometer Effect

Source: Hacker News

The Connecticut Solar Panel Observation

In 2015, two geographers noticed solar panels popping up on houses in their small U.S. state of Connecticut. Curious, they set out to determine what predicted which homes would adopt the technology. Would wealthier households be more likely to install panels? Or would population density play a role?

Early‑Adopter Characteristics

Early adopters of solar panels tend to be people who:

• Are interested in innovative technology
• Have found a trusted installer
• Believe that solar panels will benefit them personally

The “Proximity Principle”

The researchers discovered that once an early adopter made the choice, a cluster would spring up around them. Seeing solar panels on a nearby house—and being able to talk to a real person who had installed them—proved to be the strongest predictor of whether a neighbor would also adopt the technology.

International Replication

The Connecticut study was soon replicated in other countries:

• Sweden
• China
• Germany – where researchers quantified the effect. They found that rooftop solar installations were most influential on neighbors who lived within one kilometer of the original adopter. (Source: TED ideas)

Beyond Solar Panels

The “proximity principle” extends far beyond solar installations. It reflects a broader social dynamic:

• People who prioritize their health are more likely to have friends who also prioritize health.
• Similar patterns appear in other behaviors and choices.

Takeaway

We tend to become like the people we choose to be around. Visible adoption of a behavior or technology in our immediate environment can be a powerful catalyst for our own decisions.