We’ve spent the last few months detailing the reliability crisis facing the American power grid: an over reliance on renewable energy, just-in-time gas plants, and imports from neighbors is colliding with capacity retirements and power demand growth. It’s not a pretty picture. Many experts and regulators worry that more blackouts loom on our horizon.

But there’s an even more pernicious problem, a penumbra darkening the energy transition. It threatens home and business alike. We’ve mentioned it before, but today we’re doing to give it more due. It’s the issue of power quality.