If the existing power supply is sufficient to supply the A/C and lights for an area, but a new buyer comes in and offers 10% more $ to purchase all the power currently being generated, there exist also the options of 1) make the new customer pay a lot more to deliver power quickly or 2) simply deny the connection rights (presumably much easier to do when talking about gigawatt-scale requests).
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The argument is that people like air conditioning and lights, so they will pay, or leave.
If the existing power supply is sufficient to supply the A/C and lights for an area, but a new buyer comes in and offers 10% more $ to purchase all the power currently being generated, there exist also the options of 1) make the new customer pay a lot more to deliver power quickly or 2) simply deny the connection rights (presumably much easier to do when talking about gigawatt-scale requests).