Yes, you must report the number of source operating hours and you should enter zero for each missing data element in which substitute data was not used.
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Q328. For Tier 4 configurations, if there is no missing data, do you still have to report total operating hours in the reporting year and zeros for hours in which substitute data was use?
Note: The Cal e-GGRT help system includes general instruction on using the California GHG reporting tool. However, the help system may not explain differences between California and U.S. EPA reporting requirements. Please refer to the ARB reporting website for California-specific reporting requirements and additional help.