Retrofitting refers to the addition of new technology or features to older systems, for example:

power plant retrofit, improving power plant efficiency / increasing output / reducing emissions home energy retrofit, the improving of existing buildings with energy efficiency equipment seismic retrofit, the process of strengthening older buildings in order to make them earthquake-resistant Naval vessels often undergo retrofitting in dry dock to incorporate new technologies, change their operational designation, or compensate for perceived weaknesses in their design or gun plan.

Why retrofit in power planets ?

Saving on capital expenditure while benefiting from new technologies

Optimization of existing plant components

Adaptation of the plant for new or changed products

Increase in piece number and cycle time

Guaranteed spare parts availability

Reduced maintenance costs and increased reliability