My Metal Maker Widget v2.62 (for .75b1)

[lurker]

It depends on how much of your storage is free from building things, and you much you actually paid for. When I make 100k in dedicated storage buildings, I want them full until the energy is needed.

[BeefofAges]

I set the metal maker widget to keep me at 90% energy, it seems to work pretty well even when I have lots of storage.