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The CRC report has a row for each supply. A supply is in one of the the following categories at any one time:

HH
Measurement classes C (Half Hourly Metered in 100kW premises) and E (Half Hourly Metered not 100kW).
NHH and AMR
Measurement class A (Non Half Hourly Metered).
Unmetered
Measurement class B (Non Half Hourly Unmetered)

The report works out the number of days with actual data for each category and totals them up to give the 'Total Actual Days'. It then works out the maximum possible number of days with actual data for each supply category (HH, AMR & NHH or Unmetered) and totals them up to give the 'Total Max Actual Days'. If (actual / maximum) >= 183 / 365, the supply is classed as 'Actual' for the CRC period, otherwise it is classed as 'Estimated'. The total (estimated + actual) kWh are given for each category.

For a period of time (the span) when a supply is in the NHH category, the kWh and number of actual days are worked out as follows.

For the HH category, the kWh figure is found by summing:

The number of actual days is found by (number of actual half-hours / 48).

For unmetered supplies, the kWh for the span is: agreed_annual_kwh * (span / period). The agreed_annual_kwh is the annual consumption stated on the connection agreement with the DNO.

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