This market's index
Tracks what electricity actually costs in New York City right now, in $/MWh.
How it updates
The index follows a rolling 60-minute average of NYISO's real-time zonal price for New York City, refreshed every five minutes. It drifts gently through normal hours and spikes hard on hot afternoons when the grid is tight, then falls back once demand eases.
What it measures
NYISO real-time dispatch prices for the N.Y.C. zone, averaged over the trailing 60 minutes and weighted by how long each price was actually in effect. At typical daytime prices one index point is close to one dollar per megawatt-hour; at low overnight prices the index sits above the dollar figure, because the transform that keeps it positive compresses near zero.
Methodology
Each run reads NYISO's public real-time price file, discards the forward-looking advisory rows and the newest price still subject to revision, weights each remaining price by its time in effect over the trailing hour, and publishes the result through a transform that keeps the index positive even in the rare hours when power prices go negative.
| Price | Size | Trader | Time |
|---|
Source
NYISO MIS public CSV feeds.
Know the limits
Price, index, and funding
The traded price and the index are different numbers. The index is the measured value. Trades set the price, and the price moves freely around the index.
NYCRT
