PRIMARY PURPOSE: Under the general direction of the Manager, works on highly complex engineering projects and provides engineering support and technical expertise to grid and market operations. Primarily responsible for analyzing, coordinating and approving outages for the ISO grid, establishing and updating daily limits, documenting the associated operating procedures to support the safe and reliable operation of the system, and modeling the market impacts of transmission constraints. Participates in the development of ISO policies and methodologies associated with the reliable operation of the transmission grid and the efficient operation of the ISO market.   PRINCIPAL DUTIES AND RESPONSIBILITIES:   Prepares and conducts operating and clearance studies, including power flow and contingency analysis, to maintain the reliable operation of the grid. Provides requirements for clearance conditions and develops and documents operating requirements and instructions in outage plans and operating procedures. Models transmission constraints in the ISO market to ensure efficient market operations. Provides engineering support on model validation and abnormal market price investigations. Adheres to NERC reliability standards and other requirements in accordance with pre-established guidelines and physical limitations of the system. Ensures compliance with internal policies, practices and procedures, NERC and WECC standards, and government regulations.     Represents ISO operations engineering interests in applicable WECC and related committees, work groups, and other industry or public forums as assigned. Compiles, analyzes, and submits data and reports in compliance with external standards and requirements.   Analyzes complex operational engineering issues in collaboration with operators and recommends modifications to existing operating procedures. Assesses the impacts of major transmission and generation additions or deletions to the grid, recommends revisions to operating plans, communicates revised plans to operations, and updates operating procedures.    Develops, implements and documents automated computer programs, and other advanced analysis methods, to allow for comprehensive monitoring of operational performance of the transmission system and detection of transmission system problems.   Provides training, guidance, and technical expertise to less experienced engineers.   Acts as a subject matter expert and provides engineering support and technical expertise for real-time systems concerns and daily operational matters.