cnp/cer ratio

Can someone explain to me why the SP of CNP deservers to be 30% above that of CER. My relative values suggest they should at least be equal or maybe the ratio should be reversed. For the last year I have traded back and forth between the two with CER being priced above CNP for most of that time. The current ratio is out of "whack" with the past relationship.

In my mind CER got the better finance deal and should be way ahead of CNP.

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