Merge pull request #94 from carbon-data-specification/decarbonization…

…-use-case

Add Decarbonization Impacts Use Case

website/use-cases/index.markdown

@@ -75,6 +75,19 @@ To make impactful clean energy siting decisions and to measure the carbon impact
 
 * Organisations with climate goals that can target their clean energy investments to grids with higher emissions.
 
+## Use Case 4: Electrification, Storage, and Energy Efficiency Projects <a id="use-case-decarb-projects" href="#use-case-decarb-projects" class="permalink">🔗</a>
+
+Decarbonization can be accelerated through the accurate measurement of the impacts of various demand-side decarbonization projects, such as HVAC electrification and energy efficiency measures.  
+
+### Needs
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+To make trustworthy claims on the impact of these types of decarbonization projects, access to accurate and detailed grid data is required to calculate the carbon impacts based on changes in electricity consumption. 
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+### Example users
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+* Organisations conducting measurement and verification of decarbonization projects.
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+* Organisations managing registries for carbon offsets or evironmental attribute certificates.
 
 ## Use cases NOT in scope for this working group <a id="not-in-scope" href="#not-in-scope" class="permalink">🔗</a>