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Greenbyte Documentation

Budget Deviation Waterfall (Wind)

The chart works for wind assets. It compares the actual energy of a portfolio, site, or device, to its budgeted energy, how much energy you expected it to produce, and visualizes the causes of any deviations.


You are held accountable to your owners, investors, or employers against your default budget. Budgets typically include expectations as to what sort of losses are likely to affect the asset or what sort of resource will be available (Resource Index (Turbine)). These could include:

  • Amount of wind resource available

  • Budget for availability losses

This means that a budget is not an empirical measure of what a wind turbine could produce, but is rather a human estimate of what it should produce in a given month, given the likely amount of wind resource and availability. This chart helps you see how accurate that estimate was.


This widget works best on dashboards with one column.

The deviations are divided into three categories, which are listed below with the signals used to calculate them.



Energy budget

This shows the default budget defined for the wind turbine.

Energy export

This includes the actual production measured at the wind turbine.

Weather adjustment (windiness)

This visualizes the impact of actual windiness by considering the ERA5 reanalysis model as the primary source. If ERA5 is not activated on your site, then it will consider Resource Index (Long-Term Wind).


To activate ERA5 for your site, contact your respective CSM.

Contractual availability deviation

Energetic impact of the difference between the time-based contractual availability for the period of evaluation and the target contractual availability.


This shows any remaining difference between the budget and actual energy, which can't be attributed to the other categories. It could be due to the following:

  • Missing/incorrect data for the energy budget or target availability

  • Poor wind speed measurements

  • Problematic period selected

  • True residual, due to uncategorized energy or data communication issues

For each category, you can see both the energy figure and the percentage of budgeted energy that it represents.


The Budget Deviation Waterfall (BDW) is designed to be a companion widget to the Loss Analysis Waterfall (LAW), so we recommend displaying them together on the same dashboard.

This allows you to compare and contrast losses in a meaningful way. For example: “Aaargh - I have big losses on Performance! But when I look at the BDW I see that the Contractual Availability Deviation is pretty small, so actually, most of these losses were already budgeted for. Hooray!”

Drill down to find the WHY behind your losses

On the right side of the chart, you can see the 5 top offenders on the next asset level.

  • For the portfolio, you'll see the sites deviating the most from budget and the size of their deviations.

  • For a site you see the devices deviating the most from budget and the size of their deviations.

The top offenders' list normally shows the top offenders for all categories, but you can click a category to see the top offenders for only that category.

  • Click the close button in the category popup to show the total deviations again.

  • To drill down to the next asset level, click on one of the top offenders. The widget will switch to show the chart for that asset instead. Click on a site name in a portfolio chart to see the chart for the selected site.

  • Click a device in a site chart to see the chart for that device.

  • The breadcrumbs at the top, eg Portfolio > Site 1 > Device 3, show which asset is presented in the chart and enables you to navigate back to higher levels.


This widget relies on several signals. To ensure that they all work, the following settings need to be made:

  • Define a default budget on your devices

  • Availability contract set up

  • Target availability populated at the turbine level

  • Long-term wind speed populated at the turbine level




Analyze, Reports


Portfolio, Site, Wind