Does it cost less in electricity to find the kiln at night?

In some areas, electricity is cheaper at night. You can find out by asking your utility company if they have a "time of use" plan. Also, ask if they have a separate demand charge. This is where they charge an extra fee when your use more electricity than usual at any given time. If they have a demand charge, you could save by firing the kiln when other appliances are turned off.