Revenue and Tariff Analysis for Electric Utilities (RATE) is a spread-sheet based utility financial model developed by Prayas (Energy Group), Pune. The objective of the RATE model is to help policy makers, consumer groups and researchers get a better understanding of the order of magnitude impacts of various possible changes and their policy responses in the face of uncertainty.

RATE is structured to assess the impacts of various ‘what-if ?’ scenarios on utility finances and other select performance parameters. This assessment can be done at an annual level for a medium term horizon, say five to seven years.  The model has provision for dis-aggregated inputs representing various components of utility operations such as power purchase, renewable purchase obligation, surplus management (through sale or backing down of surplus power), demand estimation, tariff determination and design as well as capital expenditure.

Prayas (Energy Group) has adapted RATE for the state of Andhra Pradesh with inputs from APERC.  The RATE model for Andhra Pradesh or RATE-AP can help with scenario building for the two distribution companies in the state and the state generating company. The documentation for RATE-AP is available below.

Based on RATE-AP, PEG developed a few example scenarios to demonstrate the utility of the model. A presentation describing the model, the example scenarios and the results from the scenarios is available in the link below. The user documentation and the presentation are also available on the website of the Andhra Pradesh Electricity Regulatory Commission (APERC). For more details, please see:

For more information on the model or to request for a copy, please write to This email address is being protected from spambots. You need JavaScript enabled to view it., giving your name, organisation, address and purpose in brief.

User documentation

Presentation on RATE and example scenarios