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MDD

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EnergyPlus Meter Data Dictionary.

At a glance
Original creator EnergyPlus (U.S. Department of Energy)
Purpose The EnergyPlus meter data dictionary: every meter a run could report.
Extensions .mdd
Poka parser poka-mdd
Viewer poka-table-viewer
Depth tier Parser with a shared viewer (see Depth tiers)
Breadth tier B1 Complete (see Breadth tiers)

How much Poka reads

B1 Complete. Everything the format defines that a reader would see is decoded, in every version Poka claims. Anything not decoded is immaterial and listed.

Confidence: high (the reviewer read the code and a test that proves the claim). Basis: Reviewed 2026-10-16: parsers/poka-mdd/src/lib.rs, tests/samples.rs and scaling.rs; corpus oracle_1zone.mdd (real IDF style, EnergyPlus 26.2) and regular-style-from-oracle_1zone.mdd (re-encoded by the project, not real engine output). Both styles are read and the Output:Meter and Output:Meter:Cumulative pairs are folded.

What Poka does not read

  • The reporting frequency in the IDF-style object (the default hourly) is not shown
  • The regular-style reporting timestep column (Zone or HVAC) is not shown

Background

The EnergyPlus documentation describes the MDD as the list of report meters with their availability for a run. The Output:VariableDictionary object chooses one of two styles: IDF style, ready to paste into an input file, or a regular table. Poka reads both. In IDF style each meter is listed twice, once as Output:Meter and once as Output:Meter:Cumulative; the two are folded into one row with a flag, so meters are not counted twice.

Versions

Version Identifier Poka Note
IDF style Read
Regular style Read

Libraries

Libraries Poka uses or has assessed for this format, with the status, licence and language the registry records.

Sources