Im like you Im huge into saving electricity...not only to save money but for environmental reasons as well.
I also like to reuse things, no old feed container, or bottle doesn't find another use in my barn. Whether it be a toy for the horses (I use old zev bottles, and electrolyte bottles in thier stalls for toys) or as a container for nails, or brushes or what have you.
I also purchase a lot of stuff at our dollar store for the barn. I got some awesome buckets to use to divy up their am feedings where as the small utility buckets at our feed store cost like 10 bucks!
I also have started to go a more natural approach w some of my horses instead of spending huge amounts of $$$ on supplements. For example Baking soda is a great option as a probiotic, and all our horses get garlic as an immune booster, and helps w deterring mosquitoes in summer. This turns out to be much cheaper then paying for brand name supplements that do the samethings
Horses are like chips...you can never just have one