Wellington, Aug 25 NZPA - The Electricity Commission is investigating allegations by power generators about non-payment by clearing manager NZX, as well as an allegation against one company by NZX.

Breach allegations were made by Mighty River Power, Genesis Energy and Contact Energy, while NZX had made breach allegations against Pulse Utilities in relation to the alleged non-payment, the commission said.

Commission chairman David Caygill said the payments, due by 4.30pm on Friday, were settled by 8.30am on Monday.

There was no reason at present to be concerned about the integrity of market settlement, Mr Caygill said.

The alleged breaches would be investigated to determine what actually happened, find out the cause, and take appropriate action.

Today The New Zealand Herald reported it understood a "glitch" happened on Friday after a small energy retailer failed to make a payment into the system, resulting in the NZX freezing payments to all electricity generators.