Where –

(a) a water management plan relates to, affects or purports to relate to or affect the administration of a hydro-electric district by an electricity entity; and

(b) any provision of the plan would require the imposition of conditions on, or a variation of the conditions of, the approval of the hydro-electric district under section 176  –

the electricity entity is not bound by that provision unless the approval is amended under section 178 .