1. How much did one site use in the last 12 months?

From its bills. The rules apply site by site, so check each site on its own.

2. What is the site used for?
3. Is the site in a Climate Change Agreement?
4. Does the site melt, fire, dry or heat-treat metals or minerals?

Metallurgical and mineralogical processes, such as making glass, bricks, ceramics, cement or lime, or smelting, casting and heat-treating metal.

5. Do you reclaim the VAT on your energy bills?

VAT is charged on top of the levy, so if you can't reclaim it, the levy costs you 20% more.

6. Is the site in Northern Ireland?

The temporary 0% VAT rate on electricity applies in England, Scotland and Wales only.