Load forecasting with weather
Demand is forecast from temperature, calendar and economic drivers, with probabilistic ranges that widen with lead time and during temperature extremes.
The Global Centre for Risk and Innovation (GCRI)
Forecasting gives energy operators lead time: minutes to days for demand and renewable output, weeks to seasons for hydropower inflows and adequacy outlooks. The value lies in calibrated probabilities with stated skill, which let operators hold the right reserves at the right time.
GCRI · Established · service level R0
Load and renewable power forecasting is the prediction of electricity demand and wind and solar output from minutes to days ahead, and of inflows and adequacy weeks to seasons ahead. Calibrated probabilities with stated skill let operators hold the right reserves at the right time.
Forecasting and time-series analysis predict future values of variables from past observations and explanatory information. They support early warning and planning across hazards, markets and health. In energy, critical infrastructure and climate and hazards, forecasts trigger early action and anticipatory finance before shocks materialise. Probabilistic forecasts allow decisions to account for uncertainty across connected systems. The canonical description is on the STEM Commons.
Demand is forecast from temperature, calendar and economic drivers, with probabilistic ranges that widen with lead time and during temperature extremes.
Ensemble weather forecasts are converted into power output for each region, so operators see the probability of ramps and low-output spells, not a single line.
Seasonal climate forecasts, reservoir levels and planned outages are combined into outlooks of supply margin for the coming winter or summer.
Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.
| Term | Definition |
|---|---|
| Probabilistic forecast | A forecast given as a range of outcomes with probabilities rather than a single value. |
| Forecast horizon | How far ahead a forecast predicts, from intraday to seasonal. |
| Reserve requirement | The spare capacity an operator holds to cover forecast errors and outages. |
Where demand concentrates in cities and the rail, road and port corridors that move fuel and equipment, shown for the Nordic and Baltic region as an example geography for this subject.
Data from the source register feeds the methods; calibration and an independent test gate the estimate and its limits; the decision stays with the competent authority.
Fig. 01Nodes carry their type, metrics and state; connectors show what feeds what; the gates are the validation steps; the timeline is one application. Design of the method's use, not a record of a run.
Datasets and records used by forecasting and time-series analysis on this platform, with the role each plays and the label its values carry. Sources are listed in the source register.
| Data | Role | Label |
|---|---|---|
| Ensemble numerical weather prediction | Forecast forcing | FORECAST |
| Historical load and generation records | Model training and verification | OFFICIAL |
| Copernicus seasonal climate forecasts | Outlook forcing | FORECAST |
| Real-time metering and SCADA | Nowcasting and correction | OBSERVED |
Forecasts are evaluated out of sample with proper scoring rules and reliability diagrams. Rolling-origin evaluation tests performance over time.
| Check | How it is done |
|---|---|
| Out-of-sample verification | Forecasts are scored with proper scoring rules on periods not used in training |
| Reliability diagrams | Stated probabilities of ramps and peaks are checked against observed frequencies |
| Extreme-event performance | Skill is reported separately for heat waves, cold spells and storms, not only on average days |
Structural breaks and regime changes undermine models trained on the past. Forecast skill typically declines rapidly with lead time.
Climate and Hazards stewards forecasting and time-series analysis for the Consortium and reviews how it is applied across platforms.
The current service level is R0: information and enquiries. An enquiry receives a reference and names the next step; applications, payments, compute allocations and registrations open only when their team, terms and review capacity exist.