The situation
Your starting point
Your utility starts with a large nuclear unit, wind, solar, a small gas peaker and a battery. Much of its dependable supply comes from one reactor.
That reactor will shut down during the scenario and remain unavailable. You know the risk before taking charge, but the fleet still has to serve customers while you decide how much contingency to build.
The choices
What will you do?
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Size the gap
Look at the reactor's contribution across the day. Replacing its rated capacity and replacing the electricity customers actually use are different calculations.
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Prepare a workable reserve
Compare backup generation with storage and other supply options. A battery can shift energy into a difficult hour only if there is energy to charge it.
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Pay for readiness
Decide how much spare equipment the utility can carry before the shutdown. Balance that expense against the cost of being unprepared.
Put your plan to the test
How much of your plan still works when its largest power source disappears?
Build, watch what happens, and try a different approach. The grid is yours to run.