RCMP say the two-man crew was working in a rural area in the County of Sturgeon when the chopper came into contact with an electrical transmission tower.
RCMP say the pilot was not able to maintain control and the helicopter crashed into a field.
AltaLink says the pair were working on the Heartland Transmission Project.
The company says the lineman in the helicopter was taken to hospital in Edmonton by air ambulance while the pilot was transported by ground ambulance.
Transportation safety officials and investigators with Occupational Health and Safety are heading to the scene.
“Our first concern is the health of the worker and the pilot injured in this incident,” said Johanne Picard-Thompson, senior vice president of projects for AltaLink. “We will begin an investigation immediately to learn what may have caused the helicopter to fail.”
The Heartland line is a 500-kilovolt, double-circuit transmission line that stretches 65 kilometres and connects a substation in south Edmonton to the Heartland region near Fort Saskatchewan.
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