The Grid

Bakke, a cultural anthropologist, wrote about the American electrical grid as a physical and social system, combining technical explanation with reporting and history.

The technical foundation is the constraint that makes electricity unlike other commodities: supply must match demand continuously and instantaneously, because the grid stores almost nothing. Everything else follows. Generation must be dispatched in real time. Frequency and voltage must be held within narrow bands. A local failure propagates, which is why blackouts cascade. Capacity must be built for the annual peak, which means most of it sits idle most of the time.

The historical sections cover the system's construction, the regulated monopoly utility model and its bargain of guaranteed return for obligation to serve, the deregulation of generation in the 1990s and the resulting separation of generation from transmission, and the underinvestment in transmission that followed because no party had a clear incentive to build it. She uses the 2003 Northeast blackout, which began with untrimmed trees in Ohio, to show how the physical, institutional and informational failures combined.

The forward-looking sections cover the problems renewables create for a system designed around dispatchable generation: intermittency, the fact that solar and wind produce when the weather permits rather than when demand exists, distributed generation reversing power flows on distribution networks designed for one direction, and the effect of customer-owned generation on utility revenue models that recover fixed costs through per-unit charges.

Bakke is a cultural anthropologist rather than an engineer or economist, and the book is stronger on description and history than on technical or economic analysis. It predates the substantial growth in battery storage and the recent load growth from datacentres, both of which change the picture materially.