So... I mean, really, when you think about it, milliwatts and megawatts are just a few letters different.
If you can make, say, 100 milliwatts of power for a few seconds then you would only need thirty generators to light a 3 watt light bulb for an insufficient amount of time to use the light for anything - if the milliwatts were in the form of electricity.
If your milliwatts are in the form of heat, then you just need a slick way to convert your pretty much useless amount of heat into less than the equivalent in electricity.
"If you would make a person happy, add not to their possessions but take from their desires"