| Units: | - |
| Mode: | Input Only |
| Multi-band: | False |
| Default Value: | 0 |
| Validation Rule: | ≥0 |
| Key Property: | No |
| Description: | Maximum number of units automatically constructed in aggregate over the planning horizon |
Generator Max Units Built sets an upper limit on the number of new units that LT Plan is allowed to build in total across the entire planning horizon.
Note: This property must be defined for expansion candidates, otherwise the LT Plan will build no units by default.
For a Generator representing a discrete single-unit project this value should be set to one, as in the following example:
| Property | Value | Units |
|---|---|---|
| Units | 0 | - |
| Max Capacity | 500 | MW |
| FO&M Charge | 50 | $/kW/year |
| Max Units Built | 1 | - |
| Build Cost | 1500 | $/kW |
| Economic Life | 25 | years |
| WACC | 10 | % |
You can control when the new build is allowed to occur either by using the Project Start Date property or by using Max Units Built with a Date From tag as in this example:
| Property | Value | Units | Date From |
|---|---|---|---|
| Units | 0 | - | |
| Max Capacity | 500 | MW | |
| FO&M Charge | 50 | $/kW/year | |
| Max Units Built | 1 | - | 1/01/2030 |
| Build Cost | 1500 | $/kW | |
| Economic Life | 25 | years | |
| WACC | 10 | % |
In this example at most one new unit can be built in the planning horizon, but the new build cannot occur until the year 2030. You can controls whether the unit is built in particular years with Max Units Built in Year and/or Min Units Built in Year.
Max Units Built can be more than one to represent a multi-unit power station. For example, you might want to increase the number of units that is allowed to be built over time. However, it is important to note that Max Units Built is a cumulative number, so the dated series of values must be monotonically non-decreasing as in this example:
| Property | Value | Units | Date From |
|---|---|---|---|
| Units | 0 | - | |
| Max Capacity | 500 | MW | |
| FO&M Charge | 50 | $/kW/year | |
| Max Units Built | 1 | - | 1/01/2030 |
| Max Units Built | 2 | - | 1/01/2035 |
| Max Units Built | 3 | - | 1/01/2040 |
| Build Cost | 1500 | $/kW | |
| Economic Life | 25 | years | |
| WACC | 10 | % |
Note that LT Plan does not have to run on a calendar basis. If the planning horizon begins for example in July, it will run with planning years of June through July in which case the date tags should be consistent with this definition.
See also: