Green energy stored for months using a thermal battery of inexpensive/ scalable materials is dispatched using a 2D photonic crystal thermal emitter

https://www.aau.dk/new-technology-can-store-green-energy-for-months-n151116

"when electricity is needed, the stored heat is converted back into electricity using thermophotovoltaic cells. These specialized devices convert IR emitted by the heat source into electricity... nanostructured emitter can withstand extreme temperatures, up to 1400 °C, and has shown stable operation for over six months, making it suitable for long-term energy storage... reduces energy storage costs by up to 80% compared to traditional batteries and can also be used to recover waste heat in industrial processes"