Bit difficult to achieve for gliders.
Great idea for 'operational' powered aircraft. Usually though the only time when you are looking for a place to land in a paddock is when the fan stops.
I comes down to looking for signs of where power lines may be, ie clumps of grass in an open paddock, running along the edge of tree lines, edges of roads, etc and planning your approach when you are high enough. All well and good if they are the older style powerlines with two or more wires.
The SWER line addes a whole new issue.
But, I agree with your comment, stay away from them.
Chris