A standing wave is setup in a string fixed at both ends. Then 

If the string has a standing wave and a component of travelling wave, then the potential energy per unit length of the points of maximum amplitude is non zero at some instant of time.

The sum of kinetic and potential energies (total energy) per unit length at nodes and antinodes is constant

If the string has a standing wave and a component of travelling wave, then the kinetic energy per unit length of the points of minimum amplitude is non-zero at some instant of time.

The total energy per unit length of a point midway between a node and an adjacent antinode is constant