For the average person looking to build a solar farm on their farm or flat plot of land, the initial investment can be as low as $20,000 to $40,000. You will also be paying plenty more for the instillation, varioius extra equipment, and power lines. However, solar farms really do range much more than this; simply because it depends on the plot of land and its purpose. Although, maintanence cost are not too high, large farms costs millions if not tens of millions.
The cost of a solar farm and the economics of how the solar farm operates will differ drastically for arrays of different sizes and depending upon geographic location (i.e. due to varying insolation levels and relative availability of PV/solar equipment suppliers).
The economics of your solar farm, and whether or not it is profitable to you to own and operate it, will depend upon the amount of energy you are able to produce and the price you receive for it, versus the capital costs of buying and installing and operational costs of maintaining and running the equipment. A typical price for solar panels commercially available today is between $2 and $3 per watt, plus installation costs (browse prices at link below).
The cost of solar energy continues to decline as thinner panels using cheaper materials at higher efficiencies are manufactured in better ways and at larger scales. For the past few decades, the cost has declined exponentially for solar panels, by roughly 50% every two years (see 2nd link below), and it is expected that the conditions responsible for such cost reductions will continue for the foreseeable future.
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