Add eGrid Subregions in Area, Zone, Region

Author: jinningwang

_pages/changelog.md

@@ -11,6 +11,10 @@ toc:
 
 ## 2025
 
+### 05-07
+
+- Add item <u>eGrid Subregions</u> in [Area, Zone, Region](/wiki/area-zone-region)
+
 ### 03-27
 
 - Update the item [Digital Twin](/wiki/digital-twin) with more details

_wiki/area-zone-region.md

@@ -49,6 +49,8 @@ In MATPOWER, there is a bus parameter named "ZONE", and it means loss zone.
     </div>
 </div>
 
+<br>
+
 **Region** <d-cite key="nerc2024tpl"></d-cite>
 
 NERC divides North America into several regions for the purpose of reliability and coordination.
@@ -71,6 +73,31 @@ The six regions are:
     </div>
 </div>
 
+<br>
+
+**eGrid Subregions** <d-cite key="epa2024gridregions"></d-cite>
+
+For U.S. grid regions’ emission data, EPA provides recent and historic air emissions, including carbon dioxide (CO2), for U.S. portions of grid regions, States, and Puerto Rico.
+
+EPA’s **Emissions & Generation Resource Integrated Database** (eGRID) is the preeminent source of air emission data for the U.S. electric power sector.
+eGRID is based on available data for all U.S. electricity generating plants that provide power to the electric grid and report data to the U.S. government.
+
+eGRID is valuable to users seeking air emission data about the electric power sector in the United States.
+eGRID is typically used for greenhouse gas registries and inventories, carbon footprints, consumer information disclosure, emission inventories and standards, power market changes, and avoided emission estimate eGRID data are cited by many emission inventory and registry protocols, various emission calculation tools and applications, hundreds of academic papers, and consultants; it is used for many research applications and efforts.
+
+eGRID annually updates its emission data and rates for each of its subregions.
+It also provides aggregated data by state, U.S. total, and by sets of electric grid boundaries, including NERC regions and eGRID subregions.
+
+<div class="row mt-3">
+    <div class="col-sm mt-3 mt-md-0">
+        {% include figure.liquid
+        path="/assets/img/pswiki/egrid_subregions_map.png"
+        zoomable=true %}
+        Map of eGRID Subregions (from <d-cite key="epa2024gridregions"></d-cite>)
+    </div>
+</div>
+
+<br>
 <br>
 <br>
 <br>

assets/bibliography/papers.bib

@@ -1401,3 +1401,14 @@ @article{fuller2020digital
   discussing a range of papers that reflect these areas and the current state of research. The paper
   provides an assessment of the enabling technologies, challenges and open research for Digital Twins.},
 }
+
+@online{epa2024gridregions,
+  abbr = {Industry},
+  author={Environmental Protection Agency (EPA)},
+  title = {U.S. Grid Regions},
+  year         = {2024},
+  month        = {December},
+  day          = {26},
+  url = {https://www.epa.gov/green-power-markets/us-grid-regions},
+  bibtex_show = {true},
+}