Unison Network's increased tariff for solar electricity generators using its network has been given the green light by the Electricity Authority.
It was alleged Unison had breached the Electricity Industry Participation Code, but authority chief executive Carl Hansen said the part of the code cited did not apply to tariffs between distributors and retailers.
Unison introduced the higher tariff in April, saying solar electricity generators connected to its network were subsidised by other power consumers because they were likely to be contributing to peak demand at evenings and early mornings.
It said home electricity generators paid about $300 less than other customers annually but received the same level of service, typically using the national grid during peak demand.
The increased tariff is for new installations. Existing solar customers remain on their current rate until March 2019.