Pricing solar energy – the marginal cost factor

 The costs of solar energy are falling quickly and will probably soon be cheaper than more conventional sources.  Does this mean we will once again have large quantities of cheap energy and a return to economic growth?  Maybe and maybe not.

There may not be an immediate drop in the consumer price of power.

The maybe is because of the economic principle that price is equal to the marginal cost of the last unit produced and sold.This means solar will not influence the grid price until the whole current power infrastructure has been replaced. Until then the price will be set by whatever is the most expensive conventional power still being produced.  

It also means firms producing solar power for the grid  will be able to reap some windfall  profits as their costs of production will be lower and falling. Given the current corporate culture that firms have an obligation to maximize their profits regardless we have to anticipate most firms will take full advantage of the windfall. We observe that lots of oil reserves can be extracted at costs much lower than the current marginal cost for more expensive oil. This means some firms and/or governments are reaping windfall profits

The bright spot will be if and when the cost of solar falls enough for small units to be economical and for consumers to be able to afford them.

A further complication is the debt factor.  How much of the debt used to build the current infrastructure is outstanding?  If a large amount has to be written off, it will probably come out of what is called high power money.  If this declines rapidly  it could affect the money supply and cause some economic decline.

As the price of solar falls no doubt lots of large companies will get involved but sadly most if benefits may go to the one per cent in profits and the rest of us will be left out in the cold.  Expect turmoil rather than growth.

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