Karena perkembangan ekonomi yang cepat setelah perang dunia ke-2, masalah pasokan air menjadi semakin serius. Dan desalinasi air laut menjadi hidup dengan teknologi yang berbeda, reverse osmosis (RO)(RO), forward osmosis (FO), elektrodialisis (ED), flash multistage (MSF), distilasi multi efek (MED), penguapan flash multistage (MSF) distilasi membran (MD) dan pertukaran ion (IX). Dan sekarang menurut statistik terkait, reverse osmosis (RO) mengambil pangsa pasar 60% dan penguapan flash bertingkat (MSF) menempati pangsa pasar 26.8% dari total pabrik desalinasi air laut dunia.

According to the international desalination association (IDA), by 2013, there are more than 17,000 global desalination plants, distributed in some 150 countries. Some or all of the more than 300 million people rely on desalination to meet daily need

With the efforts to save the cost of using, the performance of US companies is more eye-catching. In 2008, the US Forbes website disclosed that a company in San Antonio, California to dilute the cost of seawater desalination to USD0.46 / ton. However, the rise in energy prices has also pushed up the cost of desalination. The United States, “Wall Street Journal” in 2007, said the United States Poseidon Resources was approved in California, San Diego, Carlsbad, built a 190,000 tons / day of desalination plant, the initial cost estimates are very optimistic Ton less than $ 0.4, but in 2012 re-assessment, has doubled to 0.81 US dollars per ton.

We all know that the development of solar photovoltaic industry, although the technological progress makes the cost greatly reduced, but the government’s subsidy policy on the development of this industry has played a significant role in the German market. Due to government subsidies, people have enthusiasm to install the photovoltaic power generation system and to make money by selling the remaining PV power to the country at a higher electricity price. This policy has helped to promote the photovoltaic power generation system widely used and helped to protect a better environment.

Meskipun perkembangan pesat dari teknologi desalinasi membawa pengurangan yang signifikan dalam biaya penggunaan, biaya desalinasi tidak dapat bersaing dengan pabrik air keran air tawar. Berkenaan dengan model sistem pembangkit listrik fotovoltaik, jika pemerintah dapat memperkenalkan kebijakan subsidi yang tepat untuk mendorong penggunaan sistem desalinasi di daerah-daerah di mana air tawar relatif langka, maka akan kondusif bagi popularitas sistem desalinasi dan keterlibatan perusahaan terkait. Dan hindari penggunaan air tanah yang berlebihan, lebih baik lindungi ekologi planet kita.