I'm VERY familiar with RO, it's a very energy intensive way to desalinize water. OTOH, using geothermal or nuclear energy, you can take waste heat from the energy production process and use it to distill the water. Then when you transport the fuel, each KG transports 9 liters of water with it as well. If we're going to continue growing the population, we need to get a lot more efficient and waste less energy.
No change in my electric bill from the little RO system I installed earlier this year. The water tastes flat though.