1308.5—Interest.
TVA shall pay a Contractor interest on the amount found to be due on a claim:
(a)
From the date payment is due under the contract or the Contracting Officer receives the claim, whichever is later, until TVA makes payment;
(b)
At the rate payable pursuant to section 12 of the Act on the date from which interest runs pursuant to paragraph (a) of this section.