Mepsy: The Appliance & Equipment Climate Impact Calculator
Mepsy is CLASP's digital tool to model the impacts of energy and carbon reduction policies. Pre-loaded with data from 162 countries, it supports analysis and prioritization for the most energy-intensive appliances and equipment.
Analyze efficiency policy options for space heating equipment, ACs, residential water heaters, refrigerators, motors, lighting, fans, televisions, beverage coolers, distribution transformers
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Welcome
Setting policies and achieving their benefits requires accurate, actionable data. Designed for researchers and policymakers, Mepsy’s dynamic interface makes it easy to identify efficiency policy opportunities and analyze their energy and carbon impacts.
How it works:
- Select a country or region, choose a product, and set an effective date to project policy benefits through 2060.
- Use pre-loaded data from more than 160 countries or enter your own.
- Download your calculation results as a CSV file for further use.
Mepsy uses a “bottom-up” accounting approach, considering the number of appliances in use in a country, the energy performance of representative products, the climate-intensity of the local power grid, and other variables to analyze the electricity use, carbon dioxide emissions, and consumer energy costs associated with a given policy scenario.
Table of Contents
For efficiency policy practitioners, accurate data and predictive models provide insight into how policy decisions translate to real-world impacts.
Explore global and national policy scenarios
Compare major global carbon emitters or select a country for regional analysis to explore a range of business-as-usual and efficiency policy scenarios for energy use, carbon dioxide emissions, and the number of appliances in use.
See the CO₂ reductions, energy use, and number of appliances in use under business-as-usual or efficiency policy scenarios
Select a country to project the impact of different efficiency policies and compare the results with other countries in the region. Use the map interface for a broad overview or delve into detailed data for a specific country.
Use pre-loaded data or input your own
The Mepsy model is based on a bottom-up stock accounting method that incorporates country-specific data on appliance energy use, markets, economic indicators, and other policy factors.
Data for Mepsy is drawn from CLASP research, market research firms, and other public and private data sources
Wherever possible, Mepsy references precise stock, sales, and energy performance data from recent CLASP in-country market studies, or country-level estimates from reputable market research firms. Where country-level data for a particular product are not available, calculations are based on estimates from regional or global averages, accounting for differences in country population, economics, or climate as relevant to a particular appliance. Future and past shipments are extrapolated based on recent trends.
View model outputs by country
At the country level, view the effects of policy choices on customer-level factors like appliance lifecycle costs, as well as national changes in energy use, carbon dioxide emissions, and the number of appliances in use as a result of the chosen policy scenario.
Mepsy's calculation methodology has been used for decades to evaluate efficiency policy options
The model inputs and results can be downloaded as a data file to support further analysis offline.
Analyzing policies with multiple tiers
Sometimes multiple-tiered policies need to be analyzed, where a package of increasingly stringent policies is implemented over several years. With the downloadable data, you can view combined impacts all in one place.
Combine multiple sets of data into one multiyear policy package with our how-to
To use Mepsy to analyze policies that have changing efficiency requirements over a number of years, follow our how-to guide and download the template. Please contact us at mepsy@clasp.ngo with any questions.
How can Mepsy help?
Policymakers
- Review efficiency opportunities in your country to help prioritize which products to address
- Experiment with different efficiency levels to see the projected results
- Leverage publicly-available data or input proprietary data
- Download your results to use in supporting analysis and share it with stakeholders
Researchers + Analysts
- Compare the benefits of policies for different products
- Conduct detailed analyses using custom shipment data and assumptions for unit energy consumption, lifetimes, grid emission factors and discount rates
Donors
- Assess the potential impacts of investing in different countries
- Visualize how appliance use varies by country, and the associated energy and climate impacts
- Ensure that policy programs address the most energy- and carbon-intensive appliances
Quick-Start Guide
Methodology
The calculation methodology has been used by CLASP and other organizations for decades to evaluate the potential impact of appliance and equipment energy efficiency policies around the world. Unique among efficiency policy tools, Mepsy is free to use and is regularly updated with the latest research on product shipments and efficiency. Wherever possible, the calculator references precise stock, sales, and energy performance data from recent CLASP in-country market studies, or country-level estimates from reputable market research firms. Where country-level data for a particular product are not available, calculations are based on estimates from regional or global averages, accounting for differences in country population, economics, or climate as relevant to a particular appliance. Future and past shipments are extrapolated based on recent trends.
To learn more about Mepsy’s methodology and assumptions, click here.
Additional Resources
- How Mepsy Can Transform Your Energy Efficiency Policy Development webinar
- How can CLASP’s tools be used? A use case from Botswana
- Subscribe to our CLASP newsletter so stay up to date on the latest Mepsy updates
More questions about Mepsy? Contact us.
