Extend Get Generic Plan Detail to include a new field: tariffCode

[RichardFoxworthy]

Description
An electricity meter will be assigned to a tariff type by the relevant DNSP. The tariff type defines the time periods for various tariff types, such as peak, off-peak, and shoulder, and also defines the network charges that the responsible retailer must bear for the consumption recorded by that meter. There is a single tariff-type assignment for each meter.

In general, retailers will align the tariff period definitions in their retail plans with the tariff types defined by DNSPs, but they are not obliged to.

Retailers are free to define their own tariff periods in the plans they offer to consumers, so they may offer ToU plans with time periods that do not align with the time periods for a DNSP-defined tariff code, or they may offer single-rate plans to consumers who are on a ToU tariff assignment.

This makes it impossible to know with certainty which plans are relevant and available to individual consumers.

Intention and Value of Change
If the Generic Plan Detail data in CDR were to include a reference to the DNSP-defined tariff type/code(s) to which the retailer will make each plan available, it would be possible for users of the CDR Get Generic Plan Detail data to know with much greater certainty which plans are relevant and available to an individual consumer, based on the network tariff assignment for that consumer's meter.

Area Affected
Get Generic Plan Detail

Change Proposed
The Get Generic Plan Detail endpoint should be extended to include a new field: tariffCode

This field will contain the DNSP-defined tariff code(s) to which the retailer makes this plan available.