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# Models

## Deterministic models

Use the `model` query parameter on any `/forecast` endpoint to select a model.

Blends numerical and AI-powered weather models with proprietary methods for maximum accuracy. Inputs may change over time.

**Horizon:** 15 days | **Updates:** Hourly

Available for all metrics and types: regional, plant, county, LMP, and gas.

The ISO's own published forecast, useful for direct comparison. Availability and regions vary by ISO.

**Horizon:** Varies | **Updates:** Varies

Available for regional demand, wind, solar, and outage only.

Historical-average baseline for assessing seasonal anomalies against current forecasts.

**Horizon:** 15 days | **Updates:** Daily

Available for regional demand, wind, solar, outage, and temperature.

## Ensemble models

Ensemble models are accessed via the `/ensemble` endpoint using the `model` parameter. Each returns multiple forecast members representing a range of possible outcomes.

The ECMWF's 51-member Integrated Forecasting System ensemble. Each member starts from slightly different initial conditions, producing a range of outcomes. Ensemble member forecasts are derived exclusively from this model and are not combined with any other weather models.

This is the default when no `model` parameter is specified on the ensemble endpoint.

**Horizon:** 15 days | **Updates:** Every 6 hours

Available for regional demand, wind, solar, outage, and temperature.

ECMWF's extended-range ensemble forecast, reaching well beyond the standard ensemble horizon.

**Horizon:** 46 days | **Updates:** Daily

Available for regional demand, wind, solar, outage, and temperature.

ECMWF's seasonal forecasting system. Provides multi-month outlooks for identifying long-term trends in demand, generation potential, and gas prices.

**Horizon:** 7 months | **Updates:** Monthly

Available for regional demand, wind, solar, outage, and temperature.

## Comparison

| Model       | Parameter    | Type          | Endpoint   | Horizon  | Updates | Availability                    |
| ----------- | ------------ | ------------- | ---------- | -------- | ------- | ------------------------------- |
| Optimized   | `optimized`  | Deterministic | `forecast` | 15 days  | Hourly  | Region, Plant, County, LMP, Gas |
| ISO         | `iso`        | Deterministic | `forecast` | Varies   | Varies  | Region only                     |
| Normal      | `normal`     | Deterministic | `forecast` | 15 days  | Daily   | Region only                     |
| ECMWF IFS   | `euro_ens`   | Ensemble      | `ensemble` | 15 days  | 6 hours | Region only                     |
| ECMWF EC46  | `euro_ec46`  | Ensemble      | `ensemble` | 46 days  | Daily   | Region only                     |
| ECMWF SEAS5 | `euro_seas5` | Ensemble      | `ensemble` | 7 months | Monthly | Region only                     |