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Understanding POSS Test Scoring: A Comprehensive Guide for Utility Job Candidates

"The POSS test scoring system uses a weighted aptitude index designed to predict a candidate's probability of success in power plant operator training programs. Rather than a simple percentage of correct answers, your score is calculated using a formula that subtracts a fraction of a point for incorrect answers to discourage blind guessing. Most utilities require a minimum aptitude index—typically ranging from 10 to 15 on a specialized scale—to move forward in the hiring process. As of 2026, the Plant Operator Selection System (POSS) remains the gold standard for pre-employment screening in the nuclear, fossil, and hydroelectric power industri..."

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