The Earth's tilt on is axis is the reasons for seasons. The half of the hemisphere (North or South) that is tilting TOWARD the sun will be either summer or spring with the half that is tilting AWAY from the sun will be either winter or fall. This is why countries that are in opposite hemispheres of one another experience opposite seasons at the same time (for example, when the USA is experiencing winter, Australia is experiencing summer!).
The area of the Earth that is experiencing summer, therefore, receives the most direct sun rays. These rays are hitting that area are traveling through less atmosphere. Also, a given amount of the sun's energy is spread over a smaller area. Thus, the answer to your question is that areas that are experiencing summer are receiving more energy.