I'm not a Helicopter type, just an ex-Oil Rig Turbine Maintenance Team Leader and regular passenger. A dead Rig or Production Platform would come under the Safety Rules which would prohibit such activities unless it was a Life or death emergency.
Risk Assessments or procedures already in place would aim for ALARP - As Low as Reasonably Practicable. So Night Landing - really nessassary ?
If it was totally dead electrically, then the whole of the production systems should have blown down to ambient pressure - this would be automatically done. The big issue would be if there is cold flaring which could be ignited by the Helicopter engines.
The whole of the go/no go would be controlled and allowed by the on shore management team, and it wouldn't be a quick decision either. The loss of a big asset and the resulting production could be a big hit for a countries well being.
At the end of the day everyone would be responsible to Government or international safety organisations.