Energy is measured in Joules (I).
Energy is stored in these eight different ways:
Kinetic energy (moving objects).
Elastic energy (stretched or squeezed objects).
Thermal internal energy (in warm objects).
Chemical energy (stored energy from a fuel).
Nuclear energy (radioactive objects).
Magnetic energy (magnetic objects).
Electrostatic energy (between two charged objects).
Gravitational potential energy (objects that have been lifted up).