smiley wrote:I think there should be a tenth critical question
10) Does the energy source deliver energy at the time that this is needed? If not does the energy source allow storage of the energy until useage, and if so what are the energy losses that are associated with this storage.
If you take solar as an example:
Solar energy is nice, but solar panels have a output which depends on the availability of sunlight. When the sky is overcast they produce less, when it is night they produce nothing, In winter they produce less than in summer due to the angle of the sun.
BY DEFINITION SOLAR IS DAYLIGHT ONLY
!!! It so happens the human species is diurnal and spends most of it's active hours during daylight. The factory, shops, schools, and two or three daily meals are done during daylight, so that is when power consumption peaks. If you solve peak-hours consumption, then the job remaining is a lot easier solving whatever small fraction is left over.
smiley wrote:There are two systems available.
No there isn't. There are dozens, scores. If you are going to be a nitpicker, then you should pick your own nits too.
Even TODAY with coal power, there is pumped water storage to use baseload power efficiently.
http://en.wikipedia.org/wiki/Pumped-sto ... lectricity
This is just the list from that link of the USA pumped water reservoirs used and their stored energy capacity:
* Blenheim-Gilboa, NY (1973), 1,200 MW
* Castaic Dam, CA (1978), 1,566 MW
* Clarence Cannon dam, MO (1983), 58 MW
* Edward C Hyatt, CA (1968), 780 MW
* Gianelli, (San Luis Dam & Pyramid Lake) CA (1968), 400 MW
* Grand Coulee Dam, WA (1981), 314 MW 
* Helms, CA (1984), 1,200 MW
* Iowa Hill, CA (Proposed 2010), 400 MW 
* John S. Eastwood, CA (1988), 200 MW
* Ludington, MI (1973), 1,872 MW
* Mount Elbert, 200 MW, 1,212 MW
* Mt. Hope, 2,000 MW
* Muddy Run Pumped Storage Facility, Drumore, PA, 1,071 MW
* Northfield Mountain, MA (1972), 1,080 MW
* Bear Swamp, MA (1972), 600 MW
* Raccoon Mountain Pumped-Storage Plant, TN (1978), 1,530 MW
* Robert Moses Hydro-Electric Dam (Niagara), NY (1961), 2,880 MW
* Rocky River, CT (1929), 31 MW
* Seneca Power Plant, PA 435 MW
* Summit Pumped Water Plant, 1500 MW
* Taum Sauk, MO, pure pump-back 450 MW (destroyed due to negligent pumping over the upper reservoir wall, see link)
* Bath County, VA, 2100 MW
* Rocky Mountain Pumped Storage Station, GA, 848 MW
You didn't mention compressed air, or hydrogen electrolysis, flywheels, super-capacitors, reversible chemical-reactions (such as un-rusting iron or un-oxidizing aluminum). Solar THERMAL is presently stored in molten salts that fire boilers through the night in California deserts and are neither batteries NOR grid-tie banking energy credits. You didn't mention that surplus daylight power can be used to make CHEAPER BATTERIES or sequester carbon-dioxide from dirty power plants.
The number of single detached homes is 75 million out of 105 million total housing units. The rooftops are average 2000 square feet on those detached homes and the daily sunshine averaged across America is 5.5 hours peak daily, year around, including counting all the cloudy stormy days. Dirt Cheap PV that makes 12 watts per square foot would power the entire country 100% off those single detached home rooftops -- EVERYTHING, including hospitals, schools, military, streetlight, malls and FACTORIES MAKING MORE PV.
It's time to end the arguments that are TALKING US TO DEATH
, and move on reducing the costs of PV down to 2.5 cents a watt in ten years.
Beer cans and beer bottles are made of the same stuff that PV is made from. Stop goofing off and learn how PV is made so it can be made for the same price as beer cans and beer bottles when it's made in the same volumes as beer cans and beer bottles. It's not rocket science -- it's 60 year-old technology, grandfathers made PV and it's in the museums already.