The Energy Sphere is the spinning thing that hovers above a Power Node once its construction has started.
It "glows" when the Power Node is being charged using the Link gun's Alt-Fire mode.
When the Power Node is construction mode the energy sphere is shown as a "ghost" type image (coloured the same as the owning team). When the Power Node is fully built the Energy Sphere goes solid.
I trust that answers your question.
EntropicLqd
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