Measuring energy and CO₂ savings
GPP 2020 calculates energy and CO₂ reductions over the whole life cycle of products, services and works. The CO₂ savings displayed are based on a comparison between emissions of previous or ‘standard’ tenders and those of the new tenders that have been implemented by the purchasing partners of GPP 2020.
Calculating the impact of low-carbon tenders
GPP 2020 low-carbon tenders need to take potential energy and CO₂ reductions into consideration straight from the beginning of the development of the tender. An initial calculation informs decision makers and procurers of the savings that can be achieved. Once the tender is awarded, all GPP 2020 low-carbon tenders are monitored and their impact is assessed by calculating the amount of energy and CO₂ savings the tender achieved. For legal reasons, the methodology cannot be applied during the award phase.
The calculation compares the difference between the stated environmental performance of two solutions: the solution chosen in the previous tender or that would usually be chosen and the option chosen in the low-carbon tender. The methodology also takes account of the specific country context.
Depending on the product, service or works in question, the impact is either calculated by drawing on existing calculation tools, or if no such tool exists by referring to the environmental product declarations. In cases where neither is available, a rough calculation of the impact of part of the lifecycle is applied.
While the methodology does not claim to represent the exact real-life savings, it offers an approximate estimation that serves to demonstrate the impact that can be achieved by including low-carbon criteria in public procurement.
You can download a detailed description of the methodology here [pdf].
Video Tutorials on the GPP 2020 Calculators
Listen to our Video Tutorials for the Energy Contracting, Office ICT, Street Lighting and Vehicles Calculators (from top left to bottom right).