Which season does solor energy start to increase?

Energy from the Sun is constant. However, from any latitude on Earth, the tilt of the Earth's axis of spin means that the effective receipt of solar energy at that latitude will increase from the "winter" solstice for that latitude/hemisphere until the "summer" solstice latitude/hemisphere. Officially this time period covers the seasons of "winter" (from the winter solstice to the vernal equinox) and "spring" (from the vernal equinox to the summer solstice).