(1)  A gas retailer is not liable to a penalty or damages for failing to supply gas if the failure arises out of any accident or cause beyond the control of the gas retailer.

(2)  A gas retailer may enter into an agreement with a person varying or excluding the operation of subsection (1) .

(3)  Nothing in subsection (1) or (2) affects the liability of a gas retailer under Part 4 .