Here are some links to plastic solar panels used in bus shelters (what we seem to be emulating with these construction barriers). If the panels are made of plastic instead of plywood, something of this nature could be useful to generate energy for necessary lighting along the construction barriers. Most of these examples are not transparent (I haven't really seen solar panels that aren't darkly colored in some way), so perhaps the solar panel could be attached to one side of the panel while information, etc. is displayed on the other. (This solution could also work with plywood, as the solar panel could just be attached to one side of the plywood and not be the panel itself...the material in the link below seems to be more of a sheeting than a panel anyway.)
If you Google "plastic bus shelter panels," you will likely find several resources to similar products.
SOLAR PLASTIC
And here is a supplier: Konarka
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