# PowerModels.jl data format
**URL:** https://discourse.julialang.org/t/powermodels-jl-data-format/43460
**Category:** Optimization (Mathematical)
**Created:** [July 22, 2020, 12:48am UTC](https://discourse.julialang.org/t/powermodels-jl-data-format/43460 "2020-07-22T00:48:57Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@fnbillimoria](https://discourse.julialang.org/u/fnbillimoria)
#### Post date: [July 22, 2020, 12:48am UTC](https://discourse.julialang.org/t/powermodels-jl-data-format/43460/1 "2020-07-22T00:48:57Z")
Hello, I wanted to query the branch data format for PowerModels.jl. I note that there are two fields in particular which are not mentioned in the matpower format, but do seem to be in some of the test cases. Particularly rate\_i and rate\_p … would someone be able to assist me with what those parameters are?
@ccoffrin
Many thanks!
---
### Author:  [@ccoffrin](https://discourse.julialang.org/u/ccoffrin)
#### Post date: [July 22, 2020, 1:18am UTC](https://discourse.julialang.org/t/powermodels-jl-data-format/43460/2 "2020-07-22T01:18:11Z")
As I recall, these are meant to be line ratings defined in terms of current (`i`) and active power (`p`). These are however not part of the data model standard in most cases but instead ad-hoc data model extensions (a feature of PowerModels) that can be used in user-defined contexts.
The supported name for current ratings is now `c_rating_a`, but this is not widely documented. Some discussion can be found here, [https://github.com/lanl-ansi/PowerModels.jl/issues/727](https://github.com/lanl-ansi/PowerModels.jl/issues/727)