Meter Data Quality Checks

Time Interval Consistency

• Check for missing timestamps: Ensure that all hourly intervals are accounted for without missing entries.

• Check for duplicate timestamps: Each timestamp should only appear once, representing a single observation for that hour.

• Verify uniform intervals: Ensure that the data points are evenly spaced with a consistent interval of one hour.

Data Completeness

• Identify missing values: Look for any missing or NaN (Not a Number) values in the dataset. Missing data should be flagged, interpolated, or imputed as appropriate.

• Check for zero values: Validate whether zero values are legitimate or represent data errors.

Units and Format Consistency

• Verify units of measurement: Ensure that all the data is in megawatt-hours (MWh) and convert any data that may be recorded in other units (e.g., kilowatt-hours).

• Check for proper numeric format: Ensure that the values are numerical, and any unexpected data types (e.g., text, special characters) are identified and corrected.

Value Range Validation

• Check for positive and negative values: Positive values should represent generation, and negative values should represent consumption. Check if these conditions are respected.

• Detect extreme or unrealistic values: Flag any extreme or outlier values that may indicate erroneous readings (e.g., negative values for generation or excessively large values).

Data Consistency

• Cross-check with Project Metadata: To ensure consistency, compare the data with project metadata, such as nameplate capacity.

• Ensure temporal continuity: Validate that the power generation and consumption follow expected patterns (e.g., gradual increases or decreases, no abrupt spikes unless justified).

Handling Anomalies

• Detect and correct anomalies: Identify and document potential data entry errors or device malfunctions (e.g., meter resetting) that may cause anomalies in the data.

• Outlier detection: Implement statistical methods to identify and potentially remove or investigate outliers that could skew results.

Out of range meter values are replaced with zero value.

Check for Consistent Data Availability Across Meters

• Ensure synchronization between multiple meters: If data is collected from multiple power meters, ensure that each meter provides data for the same time intervals.

Validation of Negative Consumption Data

• Consumption validation: For periods showing negative values (indicating consumption), cross-validate against other consumption data sources or historical trends to ensure correctness.

For CFE generation, power consumption is excluded from the process. All negative values are replaced with zero values.

Data Timestamp Verification

• Verify time zone accuracy: Ensure that the timestamps are aligned correctly with the expected time zone and that daylight saving time shifts are accounted for.

• Handle potential time shifts: Identify any discrepancies due to meter resets or synchronization issues (i.e. daylight savings time).

Check Data Provenance

• Verify data source and reliability: Ensure that the data is coming from a reliable source and that any transformations or pre-processing steps are documented and traceable.

Documenting these data quality checks in the methodology ensures transparency of the PEC registry.