Specify node.tpl.php file via template.php for a specific node.
Try:

if ($variables['nid'] == '12') {
  $variables["theme_hook_suggestions"][] = "node__nrg_shop_display";
} 


The templates folder should be checked automatically so you won't need to prepend the path, and you don't need to add tpl.php to the end of the string; the above should work for a template file called node--nrg-shop-display.tpl.php