Multi-megawatt electric heaters don't cost much. In fact, I could make a backyard megawatt power sink in an afternoon for just a few hundred bucks. 1 mile of 22 AWG bare copper wire strung through the air should do the job. When turned on, watch the whole lot glow red hot like a big space heater.
The reason people don't do this is that the cost of a grid interconnect (the paperwork, approvals, etc.) outweighs the profit from the very short periods of time the price really is negative.
The reason people don't do this is that the cost of a grid interconnect (the paperwork, approvals, etc.) outweighs the profit from the very short periods of time the price really is negative.