[HR] Off the Grid: Can't call Ranch Animal Exchange from Horse Bed

I'm playing off-the-grid using the 2 Olde Mill Lane lot in Henford-On-Bagley. I am generating power using the wind turbines and solar panels from Eco Living and I have a surplus stored if I look at Show Bills Information on the letter box.

I want to get a horse for my sims, so I bought and selected the horse bed. Under the Call Ranch Animal Exchange menu, both the Rescue and Buy Horse options are greyed out with the tooltip that "the internet doesn't work off the grid". By comparison, the phone and a laptop fully work, so the internet and phone are recognised as powered. 

I normally use mods, but I've started a no-mods/no-cc save, waited until I generated a surplus and tried again. It was still the same. I have all expansion packs, game packs and stuff packs, but only a handful of kits. 

Edit By crinrict: Added Tag to Title, Adjusted Title