Earlier quoted context omitted.
Takes about 4000 kwh to desalinate an acre foot of water. Would take about 2GW of solar to desalinate a million acre feet of water. Los Angles takes 1.2 million acre feet of water from the Colorado. Replace that with desalinization, no heep big canal needed.
For the record, California has an estimated 5.8 GW of wind turbine generation, and in the year 2019 alone, California ADDED 3.1 GW of solar generation capacity. This doesn't require a Nuclear plant or crazy economics or giant nationwide plan. The actual building, machinery, and pipework for desalinating would be a larger infrastructure project than the extra power generation to power it. The only thing this requires…
I think the problem is that desalinating water (ignoring the environmental impact of the resulting brine) will produce water that costs at a minimum many hundreds of dollars per acre-foot. This is fine for urban use, but makes many of the current agricultural uses uneconomical. Nobody will pay $5,000/acre for water so they can sell their crop for $1,000/acre. All of these discussions dance around the fact that irrigation farmers are largely turning X dollars of water into 0.25X worth of crops, and the taxpayers are making up the difference. This is true of farmers in pretty much every state that uses colorado river water - if we erased 'water rights' and allowed the water to be competitively bid on, many farmers would either leave their land fallow or switch to less water intensive crops. We're basically giving away extremely valuable water at way below market rates, we're practically guaranteed to have a 'shortage.' It doesn't make sense to add enormously expensive infrastructure just so we can turn around and keep giving the water away.