User:Simtropolitan/Sandbox/HGE

https://archive.org/stream/americancity23granrich#page/250/mode/2up

"For many years" Central district heat generation, outmoded by 2010 https://web.archive.org/web/20170201122242/https://www.holyoke.org/wp-content/uploads/2012/10/Holyoke-Energy-Reduction-Plan-May-14-2010.pdf