Concept:
Peak load power plants should start quickly and should be able to meet sudden load demand.
Step 1: Nuclear and thermal power plants take more time to start and are generally used for base load operation.
Step 2: Solar power depends on sunlight and cannot be used reliably for sudden peak demand.
Step 3: Gas turbine power plants have quick starting ability.
Step 4: Therefore, they are suitable for peak load operation.
Hence:
\[
\boxed{\text{Gas turbine power plant}}
\]