# Problem Specifications

This section provides links to the formulation agnostic problem specifications.

## Power Flow (PF)

For additional discussion on the power flow problem please see, Power Flow Computations.

Bus Injection Models (BIM)

Branch Flow Models (BFM)

Current Flow Models (CFM)

## Optimal Power Flow (OPF)

Bus Injection Models (BIM)

Branch Flow Models (BFM)

Current Flow Models (CFM)

## Optimal Power Balance (OPB)

A copper-plate approximation of the OPF problem

## Optimal Transmission Switching (OTS)

Note

if the branch status is 0 in the input, it is out of service and forced to 0 in OTS