"There is a glass-sided building on the west side of town that can be seen from a rise closer to downtown. When you drive south toward this outer building at just the right time of day you're blinded by the sunlight reflected from all of that glass. That gave me the idea that you might be able to set up a mirror low enough that it wouldn't block your panels but that it could boost the amount of light hitting it."

I tend to watch DW TV Magazine a lot - it turns up here on the Community TV Bris 31 - and they repeat it each day for a week...

A while ago - and it's most likely that was where I saw it - there was a mention of an Alps town at the bottom of a valley that experiences many months of darkness - the mountains hide the sun - they apparently have had a lot of SAD, etc. The built a large reflector on top of one side of the valley that reflects a large amount of light over most of the village, extending the apparent daylight hours. No photovoltiacs - just reflected light. Improved the village life massively.