Drought and climate risks for energy and mining: from forecast to decision

Droughts are not sudden events like a storm. They settle in over weeks or months. But the economic impact is just as severe — and harder to reverse.

For the energy sector, drought means reduced hydroelectric generation, higher marginal cost (PLD), and pressure on thermal plants. For mining, it means lack of process water, operational restrictions, and risk of shutdown.

The paradox: drought is predictable months in advance. But most operators find out when the reservoir is already low or the watercourse has already dried up.

Seasonal forecast vs. weather forecast

Weather forecast does not solve drought. It looks 3 to 7 days ahead. Drought forms on a seasonal scale — 30, 60, 90 days.

What works is climate intelligence based on historical reanalysis: comparing the current rainfall and temperature pattern with decades of data to answer:

1. Is this drought pattern normal or atypical for the region?

2. What is the probability of accumulated precipitation in the next 30, 60 and 90 days?

3. What is the projected impact on reservoirs, aquifers and watercourses that feed the operation?

The cost of reacting late

When the operator discovers the drought too late, the options are expensive: contracting thermal power (more expensive), buying water from third parties (if available), reducing production.

With 30 to 60 days of advance notice, the options change: schedule maintenance during the dry window, adjust short-term contracts, activate parametric insurance before conditions worsen.

It is not predicting the future. It is calculating probability based on decades of local climate data. And deciding before.