This will likely end up as an issue on either OpenStudio or EnergyPlus github. I just don't know which, so I'm asking here.

When I setup LifeCycleCosts objects in OpenStudio, I noticed that the LifeCycleCost:UsePriceEscalation isn't taken into account for my electricity usage.

What OpenStudio Loads into my model is the LifeCycleCost:UsePriceEscalation from the E+ datasets. For eg:

LifeCycleCost:UsePriceEscalation,
  U.S. Avg  Residential-Electricity,      !- Name
  Electricity,                            !- Resource
  2011,                                   !- Escalation Start Year
  January,                                !- Escalation Start Month
  0.9894,                                 !- Year Escalation 1
  0.9950,                                 !- Year Escalation 2
  [...]

LifeCycleCost:UsePriceEscalation,
  U.S. Avg  Residential-Natural gas,      !- Name
  NaturalGas,                             !- Resource
  2011,                                   !- Escalation Start Year
  January,                                !- Escalation Start Month
  0.9733,                                 !- Year Escalation 1
  0.9666,                                 !- Year Escalation 2
  [...]

When I look at the eplusout.html, table "Present Value for Recurring, Nonrecurring and Energy Costs (Before Tax)", for NaturalGas, I see it's taking them into account as I can use the discount rate I entered and the values for the escalation rate for NaturalGas and recreate the (net) Present Value in the table.

For electricity, it's ignoring the escalation rates. I also see that it's reported as "ElectricityPurchased", might be part of the problem.