Energy Harvesting
Hundreds of volts, tens of microwatts. The charge is tiny — only the voltage is dramatic, and voltage is not power.
— V
Peak voltage at full separation with no load connected
The matched load lands in the tens of megohms to gigohms, and that is the practical problem with TENGs — almost nothing you would want to power presents an impedance anywhere near it, so the power actually delivered into a real circuit falls well short of the average shown here even before rectifier losses. Charge density is not a material constant either: it collapses with humidity, drifts with surface wear and decays between contacts. Treat these figures as an upper bound from an idealised parallel-plate model.
Textile Triboelectric Nanogenerator Output Voltage & Power — free, with the formula and a worked example, at Textile School.