Production-based availability is a measure of how much of the potential production is actually produced. The calculation considers the energy made as a fraction of the amount that would ideally be expected based on actual wind speeds and site conditions. Defined here:
PBA [%] = [Actual production [MWh] / Potential production [MWh]] * 100 = [Energy actually produced [MWh] / Energy potentially expected [MWh]] * 100
These terms explained:
- Actual production is the amount of energy an asset produces when operational. Found by calculating energy production using the power curve of the asset and the wind speed at hub height. Calculated as the difference between potential production and lost production.
- Potential production is the amount of energy an asset can produce if it was always operational (never fails or shuts down). Found by calculating energy production using the power curve of the asset and the wind speed at hub height.
- Lost production is the energy not produced when an asset is non-operational but would be produced if it was operational.
An example for one asset during one month:
- Lost production: 85 MWh
- Actual production: 4,165 MWh
This gives a PBA of:
Potential production = 4,165 MWh + 85 MWh = 4,250 MWh
PBA = 4,165 MWh / 4,250 MWh = 0.98 = 98%
There are multiple PBA outputs to download: yearly, monthly, and non-aggregated. Example outputs can be found on the bottom of this article.
Click the heading to go directly to the table information:
PBA Monthly
Please note that the PBA Monthly is displaying the average values for each month the simulation was run.
| Cell | Description |
|---|---|
| Column A | Displays the wind farm name (if no name is provided, "default" is used as standard). |
| Column B | Displays the month of the simulation. |
| Column C | Displays the average PBA for all the P-values. Please see more about the P-values in this article. |
| Column D | Displays the P10 PBA values. |
| Column E | Displays the P20 PBA values. |
| Column F | Displays the P30 PBA values. |
| Column G | Displays the P40 PBA values. |
| Column H | Displays the P50 PBA values. |
| Column I | Displays the P60 PBA values. |
| Column J | Displays the P70 PBA values. |
| Column K | Displays the P80 PBA values. |
| Column L | Displays the P90 PBA values. |
| Column M | Displays the minimum value between the different P-values. |
| Column N | Displays the maximum value between the different P-values. |
| Column O | Displays the standard deviation. You can read more about the standard deviation on the Wikipedia page. |
| Column P | Displays the minimum confidence interval (read more about confidence interval here). |
| Column Q | Displays the maximum confidence interval (read more about confidence interval here). |
| Row 1 | Displays the column header information. |
| Row 2 | Displays the average PBA for January - to be used in reference to the different columns. |
| Row 3 | Displays the average PBA for February - to be used in reference to the different columns. |
| Row 4 | Displays the average PBA for March - to be used in reference to the different columns. |
| Row 5 | Displays the average PBA for April - to be used in reference to the different columns. |
| Row 6 | Displays the average PBA for June - to be used in reference to the different columns. |
| Row 7 | Displays the average PBA for July - to be used in reference to the different columns. |
| Row 8 | Displays the average PBA for August - to be used in reference to the different columns. |
| Row 9 | Displays the average PBA for September - to be used in reference to the different columns. |
| Row 10 | Displays the average PBA for October - to be used in reference to the different columns. |
| Row 11 | Displays the average PBA for November - to be used in reference to the different columns. |
| Row 12 | Displays the average PBA for December - to be used in reference to the different columns. |
| Row 13 | Displays the total average for all months. |
PBA Yearly
Please note that the PBA Yearly is displaying the average values for each year the simulation was run.
| Cell | Description |
|---|---|
| Column A | Displays the wind farm name (if no name is provided, "default" is used as standard). |
| Column B | Displays the year of the simulation. |
| Column C | Displays the average PBA for all the P-values. Please see more about the P-values in this article. |
| Column D | Displays the P10 PBA values. |
| Column E | Displays the P20 PBA values. |
| Column F | Displays the P30 PBA values. |
| Column G | Displays the P40 PBA values. |
| Column H | Displays the P50 PBA values. |
| Column I | Displays the P60 PBA values. |
| Column J | Displays the P70 PBA values. |
| Column K | Displays the P80 PBA values. |
| Column L | Displays the P90 PBA values. |
| Column M | Displays the minimum value between the different P-values. |
| Column N | Displays the maximum value between the different P-values. |
| Column O | Displays the standard deviation. You can read more about the standard deviation on the Wikipedia page. |
| Column P | Displays the minimum confidence interval (read more about confidence interval here). |
| Colum Q | Displays the maximum confidence interval (read more about confidence interval here). |
| Row 1 | Displays the column header information. |
| Row 2 and down | Displays the average PBA for the simulation year 1 - to be used in reference to the different columns. Please note that the number of rows will change depending the number of years the simulation was run. |
| Bottom row | Displays the total average for all years. |
PBA Non-aggregated
Please note that the PBA non-aggregated is displaying the PBA for each month and year.
| Cell | Description |
|---|---|
| Column A | Displays the wind farm name (if no name is provided, "default" is used as standard). |
| Column B | Displays the year of the simulation. |
| Column C | Displays the month of the simulation - to be used in accordance with column B (displaying the year). |
| Column D | Displays the average PBA for all the P-values. Please see more about the P-values in this article. |
| Column E | Displays the average P10 PBA values. |
| Column F | Displays the average P20 PBA values. |
| Column G | Displays the average P30 PBA values. |
| Column H | Displays the average P40 PBA values. |
| Column I | Displays the average P50 PBA values. |
| Column J | Displays the average P60 PBA values. |
| Column K | Displays the average P70 PBA values. |
| Column L | Displays the average P80 PBA values. |
| Column M | Displays the average P90 PBA values. |
| Column O | Displays the minimum value between the different P-values. |
| Column P | Displays the maximum value between the different P-values. |
| Column Q | Displays the standard deviation. You can read more about the standard deviation on the Wikipedia page. |
| Column R | Displays the minimum confidence interval (read more about confidence interval here). |
| Column S | Displays the maximum confidence interval (read more about confidence interval here). |
| Row 1 | Displays the column header information. |
| Row 2 and down | Displays the average PBA for January for the simulations first year. NOTE: 12 rows are created for each year the simulation runs, so the number of rows depends on the number of years you simulation was run. |
| Bottom row | Displays the total average PBA for all months in all years. |
Example files can be found below.