**Abstract**

Industrial facilities are rapidly changing over the years, various technological advances have led to break-through its performance. The transformation is fetched from inventions, development of sophisticated processes/technologies, digitalization, the list is incessantly growing. These technical progressions and stratagems to realize it on the life-cycle basis forces the industries to explore sustainability concepts within the scope. Also, the mission to chop back GHG emissions to protect environment is needed than ever before. Consequently, the revolution and evolution of products, processes, technologies, resources, and sustainability requirement to mitigate climatic anomaly beams on the industrial sector and ordained it to cater an approach toward optimizing all efforts. The challenge is to develop a method by accommodating all the technological advances and sustainability requirements to transform facilities into a much better performing asset. The answer is to construct and preserve industrial facilities to be energy efficient which enable them to be competitive and environmentally friendly. The chapter illustrates, through case study, the 'plant lifetime retrofitability concept in industrial facilities. Its objective is to develop the most energy efficient facility design via arranging each future modification to remain energy efficient throughout its lifecycle without deterrents and utilizing minimum capital. Finally, a way is proposed to develop inherently sustainable energy efficient design in order to cater the benefits throughout the industrial facility life-cycle.

**Keywords:** energy efficiency, sustainability, energy integration, pinch technology, process integration, retrofit, GHG emissions reduction, facility design, and oil & gas
