ENMAX Power will determine, allocate or estimate energy consumption at each site.
Interval Metered Sites
Load settlement aggregates interval-metered consumption data to obtain hourly consumption values for use in the Load Settlement process.
Cumulative (Non-interval) Metered Sites
Cumulative metered sites are allocated based on profiles. Profile are based on the following:
- ENMAX Power's residential profile is based on dynamic estimation, using residential sample sites.
- All other cumulative metered sites are based on Net System Load Shape (NSLS) (i.e., the system load minus interval, deemed and residential load.)
- Deemed profiles are applied to sites which are not metered. (i.e., streetlights, traffic lights, cathodic protection and other sites with predictable load.)
Unmetered Sites (Deemed Load Profiles)
Some sites, such as street lighting and traffic signals, are settled using load shapes derived from operating schedules. Estimated consumption is based on factors such as number of devices, wattage and hours of use.
Calculate and Allocate Distribution System Losses
ENMAX Power calculates loss factors by developing a loss multiplier (using a modeled approach) for each settled hour. The loss multiplier times the load results in the allocated distribution loss. Individual rate classes have their own 'loss factor'. Distribution Losses are allocated to a retailer based in its share of total energy consumption for the Settlement Zone based on its share of total energy plus losses.
Unaccounted for Energy (UFE)
UFE is calculated as the total system Load minus the sum of:
- Total interval metered Load
- Total cumulative load
- Total unmetered load
- Total system losses
Balancing Within Settlement Zone
Total energy allocation for each settlement hour equals the total point of delivery (POD) readings for that hour within the settlement zone (POD = interval + cumulative + unmetered + system losses + UFE).
ENMAX Power measures all of its Calgary wires service area as a single settlement zone.