The commercial developments I am aware of are 10-25 Kw parabolic dish systems that use dishes 8 or more meters in diameter. They are usually made up of smaller facets arranged on a metal frame. This way, each facet is relatively thin. The focal point is in front of the mirrors, so the structure does not block the sunlight.
A Fresnel lens would need to be of similar diameter. It would be very difficult to support a thin lens of this size without obscuring much of the light.