Musk Practical Energy Guide
A working field guide to the modern energy system — generation, grids, storage, electrification and the money behind them — built for people who have to make real decisions, not just pass an exam.
3 chapters published of 80 planned
How to read this series
Each chapter starts in plain language and ends with real equations, worked examples and questions to test yourself. No prior background is assumed — but nothing is hand-waved either. Chapters build on each other, so reading in order pays off, though each is written to stand alone.
Part 1
Energy Fundamentals
The mental model the rest of the guide rests on — how raw resources become useful work, why power is not energy, and the six-layer architecture of the modern energy system.
The Energy System: From Primary Energy to Useful Work
The mental model that makes every other chapter in this guide make sense — how raw resources become the motion, computing, heat and light that run the modern economy.
Modern civilization is an energy conversion system. This chapter builds the shared map the rest of the guide depends on: the difference between power and energy, the three conversion architectures behind thermal, solar and wind generation, why electricity is a carrier rather than a source, the six layers running from resource to useful work, and the arithmetic of storage duration, capacity factor and energy density.
Electricity: The Physics Behind the Grid
Charge, voltage, current, power and frequency — the five quantities that determine the size of every cable, transformer, battery and inverter in the modern energy system.
Saying “electricity” hides an enormous amount of engineering. This chapter unpacks what electricity actually is and why the grid is built the way it is: Ohm’s law and the arithmetic of power, why I²R losses force transmission to high voltage, how transformers step voltage up and down, the AC/DC conversions now running through every solar plant and EV, what frequency reveals about grid balance, and why real, reactive and apparent power determine the size of every piece of equipment on the network.
Power, Energy, Capacity & Efficiency
The vocabulary that separates a nameplate spec sheet from a bankable energy asset — MW vs MWh, capacity factor, C-rate, round-trip efficiency, and why “how big is it?” is never a complete question.
A 500 MW solar plant, a 100 MW / 400 MWh battery and a 90% capacity factor all sound like they measure the same thing, and none of them do. This chapter works through the quantities professionals actually trade on: how MW and MWh combine into storage duration, why capacity factor makes $/MW comparisons meaningless, how efficiency and capacity factor are independent axes, the Carnot ceiling on any heat engine, round-trip efficiency and where the missing energy goes, C-rate and the Ragone trade-off between energy and power density, data-centre load and PUE, DC/AC clipping on oversized solar arrays, usable versus nameplate battery energy, and how all of it feeds into LCOE and LCOS.
More chapters are being written. This series is planned to run to 80 chapters. New chapters appear here as they are published.