How CREST Works

Solar rooftop potential estimator & business case calculator for 25 years, by LiDAR based high resolution imagery and rich data

Choose User Category & Sign Up/ Log In

Select the relevant category out of BESCOM Consumers, Commercial Entities, Energy Department and Admin. Complete the registration by providing the required details and create username and password.

Assess Solar Potential of Your Roof

We use high-resolution aerial imagery captured through LiDAR (Light Detection and Ranging) to choose the ideal location with least shadow and maximum radiation for your rooftop solar system. Your maximum rooftop solar system size is restricted to your BESCOM sanctioned load. If you wish to change the proposed location for your rooftop solar system, you can choose to use the “customise” function in the tool.

Select Your Building

After logging in, you will be directed to your vicinity, where you have to identify and select your building.

Check Financial Viability

You have to provide your monthly energy consumption details along with electricity charges to analyse your savings based on the rooftop solar system design. You can also alter the financial parameters such as term loan details and component costs. Based on the annual energy generation projections for 25 years from the rooftop solar system, you can check the business case of your rooftop in terms of cumulative annual energy savings, IRR & payback period.

Journey of CREST

Here is a glimpse of the CREST development process - how we started out and where we stand today.


CREST is a web-based tool for you to assess the technical and financial viability of installing a rooftop photovoltaic (RTPV) system on your building rooftop. Unlike other available products, CREST has followed an innovative process to quantify the possible RTPV system size and associated business case. Airborne Light Detection & Ranging (LiDAR) was used for the first time in India to assess RTPV potential across 1,179 sq. km. in and around Bengaluru. The high-resolution aerial imagery captured through LiDAR led to creation of virtual 3D maps of the whole area. This was used (along with solar geometry equations) to calculate the solar potential on each roof after considering shading aspects created by neighbouring obstacles such as trees, buildings, poles, etc. This tool also interfaces with BESCOM’s consumer database, linking your BESCOM Account ID to your chosen building rooftop. The tool then calculates the optimal RTPV system size based on your sanctioned load from BESCOM and shows you the ideal location on your rooftop for RTPV installation. The tool also gives you flexibility to choose any area inside your rooftop and check RTPV feasibility, in case the recommended location is unsuitable for you for any reason. We hope that you use the CREST tool responsibly to make informed decisions about installing RTPV on your building.



If you have enquiries please email us at