Both plants and animals must make the complex molecules necessary for life. One example is the production of DNA - your genetic material. If you don't make extra copies of DNA, you will have no information to pass on to your offspring. Every time one of your cells makes a copy of itself, it has to make a new copy of the DNA. That synthesis process requires a lot of ATP.
The process of growth requires a lot of synthetic work to create the new cells and enlarge the structures.
You may not think of yourself as an electrically operated machine, but you are. Each of our cells has an electric potential associated with it. This potential, or voltage, helps to control the migration of ions across the cell membranes. A major example of electrical work is in the operation of the nerves. When your nerves fire, they generate an electrical impulse called an action potential which can communicate information to your brain, or carry a signal from your brain to a muscle to initiate its movement.
Electrical energy transformation is essential for sensing your environment as well as for reacting to that environment in any way.