The phrase "intermittent nature" means that something does not occur or happen constantly or regularly. It happens on and off or at irregular intervals. Full definition
People must close zero CO2 nuclear power plants and build new natural gas power plants that make CO2 in order to make up for the unpredictable and intermittent nature of wind and solar power. (realclimate.org)
She knows the fragile, intermittent nature of her inclusion in that category and becomes afraid that, if she were genuinely of the culture, she might seek the safety of withdrawal. (religion-online.org)
The «sleeping dragon» is not going to even open its eyes until the cost of solar PV has been reduced by at least a third, and that's not even taken into account the costs of intermittent nature of solar power. (climate-resistance.org)