- Efforts are being made to lower the desalination costs through the use of cogeneration plants (by getting desalted water as a by-product from a plant designed primarily for energy generation), increasing energy consumption efficiency, and augmenting conventional plant power with solar, nuclear or any other energy sources. Also the improvement of the control systems for MSF units lead to improvement in plant efficiency due to optimization of control parameters, better operation cost due to minimizing operation and site supervision staff, and enhanced safety of personnel and equipment. The first Data Reconciliation and Optimization System (DROP) was at Al Taweelah MSF plant in the UAE in 1996 [11]. The objective of this system is to minimize the cost of steam, electrical energy and the chemical consumed in each MSF unit. Also, there are many attempts to use the off-peak electrical energy in sweater RO desalination systems.