A n explosive investigation into the massive mistakes being made with power bills reveals serious flaws that affect nearly every electricity user.

A whistleblower has told how his his power company offered to pay him off when he uncovered issues with their smart metre billing, sparking calls for a national inquiry.

Australia's Energy bosses have reason to be concerned, as one man's discoveries are about to become public knowledge.

Evidence of serious systemic billing errors affecting Australia's largest power company Origin Energy have come to light - resulting in overcharging and usage mistakes as high as 200 per cent.