CAISO OASIS — Open Access Same-time Information System

It is where the California ISO publishes the numbers its own settlements run on - the formal answer to FERC's open-access rule, and in practice the richest single feed of western power-market signal anywhere. CAISO OASIS organizes roughly one hundred report families under a handful of headings: Prices, carrying day-ahead and 5-minute real-time locational marginal prices with energy, congestion and loss decomposition, hourly real-time load-aggregation-point prices, HASP and FMM runs, flexible ramping nodal prices, imbalance reserve and reliability capacity prices, constraint shadow prices, ancillary-service clearing prices, greenhouse-gas and allowance index prices, and Market Power Mitigation outputs including competitive paths and reference buses; Ancillary Services, covering requirements, actual operating reserves, awards and mileage; System Demand, with demand and peak forecasts plus wind and solar forecasts and their advisory and sufficiency variants; Transmission, tracking current usage, outages, interface usage and available capacity; and Energy, holding load and resource schedules, exceptional dispatch, marginal losses, convergence bidding, uplift and WEIM/EDAM transfers. Two further groups round it out: Congestion Revenue Rights auction results and inventory, and ATLAS reference data naming every PNode, hub, TAC area and network-model mapping.

The grain matters as much as the breadth. A single node for a single day of 5-minute real-time prices with all four components is already on the order of eleven hundred rows; multiply by four thousand nodes, three market runs and thirty-nine months and you understand why nobody keeps the whole thing handy. The California ISO publishes it; Datadory is how teams actually hold it.

Node-level revenue modeling. Take day-ahead LMPs with energy, congestion and loss split at your specific PNodes and you can price a merchant asset's basis against its hub, backtest how often congestion ate the spread, and stress the result against the real-time series instead of assuming the day-ahead settle held.

Battery and flexibility arbitrage studies. Five-minute real-time prices are the raw material storage economics run on: spread capture across dispatch intervals, mileage-relevant volatility from the ancillary-service mileage components, and flexible ramping product awards to size how much of the opportunity is being competed away.

Forecast verification. The demand, wind and solar forecast families sit beside the outcomes they predicted, so forecast error becomes a measurable, node-specific quantity rather than an anecdote - useful both for trading and for anyone valuing a project whose revenue depends on someone else's forecast quality.

Transmission and congestion research. Constraint shadow prices, interface usage and outage records line up with the congestion component of nodal prices, turning 'the wires were tight' into a dated, quantified event series.

Western footprint expansion. WEIM and EDAM transfer rows extend the same accounting beyond California to the broader western footprint, which is increasingly where IPP growth capital is looking.

Traders and quants at shops with western exposure build their basis, spark-spread and storage models directly on the nodal price and ancillary-service families, reconciled against PJM Markets & Operations the same way for the east. IPP analysts and originators benchmark candidate sites and existing assets against realized hub and nodal prices, and use the CRR results to see who holds the hedges. Market researchers and policy analysts track congestion, renewable curtailment pressure and resource adequacy through the transmission, demand and RA report families. Data scientists treat NODE plus MARKET_RUN_ID plus the timestamp trio as a clean relational spine that joins upward into generator inventory from Form EIA-860 and downward into anything with a location in California.