Your daily energy should come from strong desire to fulfill the purpose of the day. Even God had a purpose to create something new on each day of creation. Without a purpose, life is meaningless. Your work, career, studies, projects or any meaningful activity is your reason for living at the moment–this is where you draw your energy. Do it (whatever your work is) and do it very well.
The source of your happiness is waking up each day and finding what your heart desire to do and you are doing it. The energy comes naturally.