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6 changes: 3 additions & 3 deletions guides/capacity.mdx
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Expand Up @@ -47,15 +47,15 @@ The differences between registered and maximum capacity vary by generation techn

It is worth noting these values can differ considerably and may have implications for analysis. Consider how solar farm capacity has varied with time.

![solar ratio by time scatter.png](/docs/images/solar_capacity_ratio.png)
![solar ratio by time scatter.png](/images/solar_capacity_ratio.png)

On the y-axis we have the ratio of registered to maxium capacity, and it is evident many facilities have a much larger registered capacity. Consequently, it is important to keep in mind which capacity metric is used for a given purpose as they may yield meaningfully different results. This ratio for fossil fuels is often less dramatic, though the decision may still be important. Take the generation at a Bayswater unit (BW03).

![bayswater reg generation.png](/docs/images/BW03_reg_cap_exceedance.png)
![bayswater reg generation.png](/images/BW03_reg_cap_exceedance.png)

BW03 had a registered capacity of 660MW during 2024, however for 2154 hours, or over 24% of the time, it averaged generation above this value, whilst other coal facilities will have a substantially different profile. For instance Eraring's ER01 did not exceed its registered capacity for any hourly period in 2024, despite having a maximum capacity 30MW greater than its registered capacity.

![eraring reg generation.png](/docs/images/ER01_reg_cap_exceedance.png)
![eraring reg generation.png](/images/ER01_reg_cap_exceedance.png)

For a detailed technical discussion of these capacity measures, see WattClarity's analysis: [Analytical Challenge – choosing what measure to use, for 'Installed Capacity'](https://wattclarity.com.au/articles/2022/09/analyticalchallenge-installedcapacity/)

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