Happy to help. There is also a picture of Mads Peter Christensen standing outside the power plant. I could scan it send to you.
The book is Our Yesterdays, A History of Ephraim, Utah 1854-1979. It has no author but says it was edited by the Centennial Book Committee, Ephraim, Utah.
It was published in 1981 by Ephraim City Corporation. My sister and I did a road trip of Sanpete County to visit all the places where our ancestors lived. I would have picked this book up in Ephraim at one of the stores or museums, I think. I'm sorry but I can't remember exactly where. If I find out, I'll let you know.
I would be interested in any pictures you might have of Allreds or Nielsens.
Linda