The maximum potential energy is at the top of each swing and is at its minimum at the bottom of the swing when it is perpendicular to a horizontal surface. The maximum kinetic energy is at the bottom of the swing, and is at its minimum at the top of each swing.
Please refer to the related link below for an illustration.
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Presuming you mean at which point in the pendulums swing; it will be at the point when it is farthest from its equilibrium position (where it is at rest).
It has most potential energy when it has just stopped, at the highest point of its swing.
As the bob reaches its extremes there the potential energy is maximum
When the bob stops (monetarily)
Potential energy can be converted into kinetic energy, as seen in a swinging pendulum where potential energy at the highest point is converted into kinetic energy at the lowest point.
The greatest potential energy will be located at the highest point of the pendulum or roller coaster, when the object is farthest from the ground. The greatest kinetic energy will be located at the lowest point of the pendulum or roller coaster, when the object is moving fastest.
At the lowest point of its swing, a simple pendulum's velocity is at its maximum, and its potential energy is at its minimum. The kinetic energy is at its highest since the pendulum has the highest speed.
A pendulum is a classic example where kinetic energy is continually converted to potential energy and vice versa. As the pendulum swings, it reaches its highest point where it has maximum potential energy and minimum kinetic energy, and at the lowest point of its swing, the opposite is true with maximum kinetic energy and minimum potential energy.
A pendulum is fastest at the lowest point of its swing, where its kinetic energy is maximum. At this point, all the potential energy has been converted into kinetic energy, resulting in the highest speed of the pendulum.