§12A-2-615.

§12A-2-615.
   
   Except so far as a seller may have assumed a greater obligation and
   subject to the preceding section on substituted performance:
   
   (a) Delay in delivery on nondelivery in whole or in part by a seller
   who complies with paragraphs (b) and (c) is not a breach of his duty
   under a contract for sale if performance as agreed has been made
   impracticable by the occurrence of a contingency the nonoccurrence of
   which was a basic assumption on which the contract was made or by
   compliance in good faith with any applicable foreign or domestic
   governmental regulation or order whether or not it later proves to be
   invalid.
   
   (b) Where the clauses mentioned in paragraph (a) affect only a part of
   the seller's capacity to perform, he must allocate production and
   deliveries among his customers but may at his option include regular
   customers not then under contract as well as his own requirements for
   further manufacture. He may so allocate in any manner which is fair
   and reasonable.
   
   (c) The seller must notify the buyer seasonably that there will be
   delay or nondelivery and, when allocation is required under paragraph
   (b), of the estimated quota thus made available for the buyer.