Have you ensured that Plantera has been beaten in your current World? If Plantera has not been defeated, you will not be able to spawn Golem, even with a Power Cell at the Altar.
For Plantera's bulb to appear the World will have to be in Hardmode and have the 3 Mech Bosses killed. After those conditions are meet, it might take some time for a bulb to appear to kill Plantera.
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