Energy company has globes with life-sustaining mediums (10)

I believe the answer is:

ecospheres

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'life-sustaining mediums' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'energy company has globes' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mcp).
'company' becomes 'co' (abbreviation).
'has' says to put letters next to each other.
'globes' becomes 'spheres' (I've seen this before).
'e'+'co'+'spheres'='ECOSPHERES'

'with' is the link.

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I've seen this clue in the Sydney Morning Herald.

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