How US power markets work.

Nodal LMP is the price of electricity at one specific point on the grid. A plain-English guide to locational marginal pricing: energy, congestion and losses, and why the same megawatt costs $15 in one town and $80 nearby.

The DART spread is the gap between day-ahead and real-time electricity prices. What it means, why it exists, and why traders and batteries watch it more closely than any other number.

Wholesale electricity prices regularly drop below zero, and producers pay consumers to take power. Why negative prices happen, why plants keep running through them, and why batteries love them.