The man in his 20s was rushed to Yeppoon Hospital after critical care paramedics arrived to the farm north of Rockhampton on Wednesday morning.

A helicopter has been sent to airlift the man for further treatment, while three others were transported to Rockhampton in a stable condition.

Another man in his 20s and two others in their 40s are also stable, a spokeswoman for Queensland Ambulance Service said.

Queensland Police, fire and rescue crews and workplace health and safety also attended.

Ergon Energy were on scene to isolate the power.