Cogeneration plant error in switch

There is an error when considering the cogeneration plants in the simulation.

```
RuntimeError: Failed to set value for param=gen_full_load_heat_rate, index=cogeneration_natural_gas_023, value=9.253568815.
	source error message="Index 'cogeneration_natural_gas_023' is not valid for indexed component 'gen_full_load_heat_rate'"
```