HOMER Grid 1.1

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Navigation: Design > Components > Utility

Create Simple Tariff

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icons8-transmission-tower-512

This method of including a tariff is useful in cases that there is a tariff you are unable to find/ is unsupported with "Choose Tariff".

A tariff created using this simple tariff builder:

1.Can include energy charge, demand charge and fixed charges

2.Can allow for net metering

3.Cannot cover tiered rates, time of use rates and other complex rate structures.

To create a simple tariff, follow the below steps:

Step 1: Enter the various charges in the tariff.

Below is an example of a tariff modeled after the Tanzanian Utility (Tanesco).

Simple_Tariff

Step 2: After you have entered the tariff inputs, you will see a tariff information screen

simple_tariff_landing_page

Step 3: Use the "Compute Bill" to check if HOMER Grid can match the costs to an actual electricity bill. This feature can be used only if the user has entered an electrical load in the model.

A-1_compute_bill

To view the actual costs, choose the "Table" option as shown below. This table should give the monthly break down of costs. These costs can then be used to compare with an actual electricity bill.

A-1_compute_bill_table

Step 4: Enter non-tariff related inputs:

simple_tariff_emissions_sale_limit

- Grid sale limit (kW)

A sensitivity variable that can be used to limit the amount of grid sale that is allowed (kW)

- Emissions

The Emissions tab allows you to specify emissions factors for several pollutants.

Variable	Description
Carbon Dioxide	The amount of carbon dioxide released per kWh of grid power consumed by the system, in grams/kWh
Carbon Monoxide	The amount of carbon monoxide released per kWh of grid power consumed by the system, in grams/kWh
Unburned Hydrocarbons	The amount of unburned hydrocarbons released per kWh of grid power consumed by the system, in grams/kWh
Particulate Matter	The amount of particulate matter released per kWh of grid power consumed by the system, in grams/kWh
Sulfur Dioxide	The amount of sulfur dioxide released per kWh of grid power consumed by the system, in grams/kWh
Nitrogen Oxides	The amount of nitrogen oxides released per kWh of grid power consumed by the system, in grams/kWh

HOMER uses these emissions factors to calculate:

•The emissions of each pollutant resulting from grid power purchases.

•The avoided emissions of each pollutant resulting from grid power sales.

The values of these coefficients depend on the generation mix of the electricity in your area. In an area where the majority of the electricity is produced from coal, these values are relatively high because burning coal results in large emissions of pollutants. Natural gas generation results in somewhat lower emissions, and nuclear and hydro generation result in virtually no emissions of these pollutants.

See the table of US grid emissions factors section in the help for more information. For additional resources, see the Finding data to run HOMER section.