[minhmeoke]

Rather than generating electricity directly, it might be more practical to reduce electricity consumption using other approaches:

Geothermal can be a solution for generating electricity directly, but if you'd like to minimize electronic waste perhaps it would be easier to use it to replace alternative energy sources for HVAC purposes.

Biofuels (eg: plant bamboo, grow it, then burn it) can also technically be closed cycle energy sources.

Solar water heaters can also reduce electrical or fossil-fuel-based energy consumed for generating hot water.