Guys, I have a slightly different perspective here. I took the civil exam in '09 and left knowing that I had crushed it. I knew my study materials had been spot on.
I took power last week and was baffled by how different the test was than the study materials. The biggest issue wasn't what was on the test, but what was not on it. I worked the 4 CI exams twice each. Graffeo, once. NCEES, three times. I was at the point to where I could do those exams without opening a book. The actual exam did not have the same stuff.
Also, I liked Wildi because it actually covered things specific to industry. I actually learned stuff helpful for my job. I also had Grainger and Camara and dozens of printed guides. The NEMA guide for adjustable speed drives is helpful in industry too.
I should have taken NEMA MG-1 and also something more on batteries. I needed more on illumination (Graffeo and Camara were helpful but not enough).
I was thankful to have a full NESC. I was also happy to see NEC 2011 lining up with 2014, but I did have one question that I am considering reporting to NCEES because it was "off."
I found at least one typo (kva vs kv) that did not materially affect the question but it did make me question the quality of the exam authoring.
Summary: I am convinced that the lower pass rates in power are due to there not being one comprehensive guide that a candidate can study to prepare for the test (plus codes, obviously). Over in civil, we have Lindburg's book which looks like Camara. You basically need that and you're good to go. If you work all the practice problems in the workbook, you're ready. The practice is harder than the test, but it all relevant.
Just my two cents. Back to work while we wait on the results...