What is the best example social norm effect economy?
Well, it sounds like the paper is drawing a conclusion between behavioral responses towards energy consumption when they're shown public averages. 

There's a problem with that paper -- unless it makes specific reference to this: 
- How does he/she derive causation between variation in electricity and 'social norms'? I don't see social normality being the primary influence. 

Separately there are psychological effects at play like:

• Bystander Effect, Social Loafing, Diffusion, and Moral disengagement 

That very much could be at play, confounding the entire study. What if I chose to increase energy expenditures 'just' because I see that the averages aren't 'that bad.' 

"Everyone else is saving well, so I can go heavy and not hurt the environment as much..." 

This incentive and what I understand as the one described in the paper where people conform to a standard norm are different.

But if you're doing some homework and need some 'answer': there are many, cigarettes are very heavily advocated against right now. Someone would choose to change their habit of smoking because 'it's currently less acceptable.