ZURICH, SWITZERLAND – Environmental group WWF would like to see us stop wasting 75 percent of the electricity we use to hard-boil some 900 million eggs every year. The group doesn’t comment on our consumption of 100 hard-boiled eggs each, but it does says we could prepare them more efficiently.
The group asked Salt (Swiss Alpine Laboratories for Testing Energy Efficiency) to test and compare several methods. Their results (left to right in the graph):
1) egg cookers, which use little water and turn off once the eggs are cooked;
2) eggs cooked in two-fingers depth of water, lid on and heat turned off as soon as the eggs come to a boil; eggs are left for 20 minutes
3) same as number 2 but on a vitroceramic stove
4) vitroceramic stove using a lot of water and no lid
5) non-votroceramic, a lot of water, no lid
6) induction heat, a lot of water, no lid.
WWF says that unfortunately, most cookbooks still advice people to do it the old-fashioned and energy-inefficient way.