A consistent approach to impact calculations allows companies, investors, policymakers, multi-lateral institutions, non-government organizations, and other sector stakeholders to estimate the impacts created by off-grid solar in a consistent, clear, and coherent manner. The metrics help build the evidence base for the many benefits that off-grid solar lighting and high-performing appliances unlock for people previously living in energy poverty.

The first standardised impact metrics for lighting products were launched in 2015. The latest version (4.0) enables users to estimate the impact of different categories of off-grid technology (from solar lanterns to large solar home systems) across four different regions.

The GOGLA standardised metrics also form part of the official IRIS catalogue, an initiative of the Global Impact Investing Network.