FIGURE 9.A.3 System Average Interruption Duration Index (SAIDI) for the state of Ohio, 20002007. Expressed in minutes, the average SAIDI in the state of Ohio has been holding approximately steady over the last 7 years.

FIGURE 9.A.3 System Average Interruption Duration Index (SAIDI) for the state of Ohio, 2000–2007. Expressed in minutes, the average SAIDI in the state of Ohio has been holding approximately steady over the last 7 years.

Source: Ohio Public Utility Commission.

  • Restoration. It can take days or weeks to return today’s grid to full operation after an emergency. As better information, control, and communication tools become available to assist the operators and field personnel of a modern grid, it can be restored much faster and at lower cost.

  • Routine operations. With the help of advanced visualization and control tools, fast simulations, and decision-support systems, the operators of a modern grid can better understand its real-time state and trajectory, provide recommendations for secure operations, and allow appropriate controls to be initiated. These capabilities could help achieve significant reduction of the system peak-to-average ratio, thereby saving resources.

  • Optimization. The modern grid provides advanced tools for comprehending conditions, evaluating options, and exerting a wide range of control actions to optimize grid performance, whether from reliability, environmental, efficiency, or economic perspectives.

  • System planning. Grid planners must analyze projected growth in supply and demand to guide their decisions about where to build, what to



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