STEM help / Data dialogs

Time Series / Exponential Growth

If you choose to enter a time series as an Exponential Growth, you must specify a Base value and a Multiplier parameter, representing an annual growth (or decay). This type of time series is commonly used to specify tariffs.


The value of the time series in the Base Period.

Default: 0.0.

Multiplier (1)

An amount which multiplies the previous year’s value in each year. A value of 1.05 represents 5% annual growth, while a value of 0.95 represents a 5% decline. The Multiplier parameter must be positive, and no greater than 2.

For a Floor, the Multiplier indicates how fast the curve converges to the specified Floor. A lower value will create a steep decline towards the Floor in the early years.

Default: 1.0.

Base Period

Specifies a particular period when the Base value should apply. This can be a year, a quarter, a month, or even a fully-qualified date.

Default: Y0.



Determines what point in the Base Period or Period the Base value or corresponding values is/are associated with.

Default: End for demand-related inputs, but Beginning for tariffs and cost trends.

Step (1)

Constrains the dynamics of any time-series input to yield a constant value for quarterly, annual or even indefinite periods.

Default: Day (no constraint is applied: values evolve smoothly).


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