This boy is so happy because ...

... his parents just installed a solar energy system which will save a lot of money over it's lifetime. Enough to help pay for his college.

... his grandparents installed a grid-tie with battery backup system. Because they purchased this system, they don't have to worry about future energy costs going up and eating into their fixed income. The battery backup system also guarantees that they will have power to play video games when the electric grid is not operating.

... both of these systems will help to ensure that the environment is in good condition when he grows up and has a family.