Storing and Transforming Energy

Batteries, hydrogen, pumped storage and heat, from their materials to their end of life.

The problem nobody sees until the sun or the wind is missing

A solar panel produces nothing at night; a wind turbine stops if there's no wind. For electricity to be available when it's actually needed — not only when it's generated — it has to be stored: in a chemical battery, in water pumped to an upper reservoir, in molten salt, in hydrogen, or in compressed air. Every one of these ways of "storing" electricity requires building something, loses energy on every charge-discharge cycle, and degrades over time.

What this route follows

Open a battery and follow its materials from the mine to recycling: lithium, nickel, cobalt, graphite, copper. Then compare it with hydrogen, pumped hydro storage, and thermal storage — four different ways of solving the same problem, with very different manufacturing costs, round-trip efficiency, lifespan, and material footprint.

One central idea

There is no "perfect storage." A battery is compact and efficient but requires mining and an end-of-life to manage; a pumped-hydro reservoir lasts decades without degrading but needs a specific geographic elevation difference and reshapes a territory; hydrogen can store energy for months but loses a large share of it at every conversion step. The useful question is not "which storage technology is best?" but "how long do I need to store this energy, and what material cost am I willing to accept for it?"