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It's not very big, but there is the Tygh Valley power station at the base of White River Falls, and boy is it spectacular. I think White River Falls is one of the hidden gems of Oregon, and even though you probably wouldn't be spending much time inside of the power station, that would only be because you want to explore the canyon around it.
White River Falls is in Wasco county, so it's not far from Portland or Sisters. From Portland, you'd take I-84 east to The Dalles, and then take 197 south to Sherars Bridge Highway... also famous for being where My Own Private Idaho was filmed. From Sisters, you'd just take 97 and then 197 north. I'm going to post a few pictures because if you haven't been to this place, it's really spectacular.