The table below shows common Kilowattt demand for various appliance and tools. At the bottom is a max- min use estimate. As a side note, one will notice most of the heavier loads are associated with creating heat (or the acoustic equivalent, noise). The exception is a well insulated water heater actually operates infrequently in the absence of hot water usage and therefore isn’t much of a (relative) load.
The next graphic is up-to-date residential electric pricing for all U.S. states with ICW+ states specifically colored and labelled. The U.S. average is $0.12 per KwH and the ICW number is $0.1324. These are DOE numbers accurate as of September 2012.
Now we combine those in a spreadsheet analysis. Rates from $0.08 per KwH to $0.20 per KwH encompass all U.S. State averages except Hawaii at 37.7%. The Bahamas numbers are up to date as of this month. U.S. Marina daily charges are running from $5-$10 per day. Generally $5 for $0.12/KwH electricity is not a bad deal — if one is a max user. The higher rates seem to be pricing for reasons other than cost recovery — perhaps to keep an undesirable element away. The U.S. and Bahamaian averages are highlighted in beige. Gross profit is based on average (26KwH/day) use.
Lastly, we have real world data from our stay in Marsh Harbour this past spring. The high consumption days (which saw us barely meeting the minimum in the business case analysis) were because we ran the air conditioning to drown out bad bands at Snappa‘s* and to deal with a spike in temps. Without this bias our consumption would have come in around 2.7 KwH for $1.62/day instead of 4.4 KwH for $2.63/day.
Consuming electricity is like all other consumer issues, caveat emptor. Before one plugs in, it’s a good idea to ask, do I need this…or do I want it? If you want it and want to pay for it, it’s a good deal. If you need it, then one might consider using as much as one can, when one can, to bring the deal back in the direction of the buyer’s side of the table.