Refrigerant based dehumidifiers produce about 2 liters per kilowatt hour (at least in a somewhat damp basement -- probably less efficient in drier areas). So that would be over 40 megawatts of continuous input needed to get 2000 liters per day. Or, at 10 cents per kilowatt hour, $100 of electricity per day to reach that target. Or about 5 cents per liter -- not too far off from the 2 cents needed, and it can be renewable if powered off wind or solar. But then you need to factor the capitalized cost of the equipment in -- a dehumidifier is about $100.00 or so, with a 5 year write off that works out to be 1/10 penny per liter. Not sure how much the solar panels will cost to run it though.