add basic explanation text for CO2 calculation in report

app/cp_nigeria/helpers.py

@@ -1259,13 +1259,25 @@ def create_report_content(self):
                 self.add_list(self.create_community_criteria_list(qs))
         self.doc.add_page_break()
         self.add_heading("Annex")
-        self.add_heading("Next steps guideline for community", level=2)
-        self.add_heading("Financing sources database", level=2)
+        # TODO decide if these documents should be a part of the implementation plan or separate
+        # self.add_heading("Next steps guideline for community", level=2)
+        # self.add_heading("Financing sources database", level=2)
         # TODO add tables about cost assumptions etc here
         self.add_heading("Tool assumptions", level=2)
         self.add_df_as_table(get_asset_assumptions(self.project), caption="Asset assumptions")
         self.add_df_as_table(self.cost_assumptions[0], caption="CAPEX cost assumptions")
         self.add_df_as_table(self.cost_assumptions[1], caption="OPEX cost assumptions")
+        self.add_heading("CO2 mitigation assumptions", level=2)
+        self.add_paragraph_with_hyperlink(
+            "The projected CO2 mitigation is calculated by comparing the business-as-usual (BAU) "
+            "emissions with the emissions generated by the mini-grid, and is based on the following CDM methodology. The BAU scenario assumes the "
+            "same demand as the project scenario. Of this demand, 55kWh for each household are assumed "
+            "to be covered by kerosene, while the rest is covered by diesel generators. In the mini-grid"
+            " scenario, the total emissions from the diesel genset generation are considered. "
+            "For information about the methodology and used emission factors, please refer to the methodology.",
+            "CDM methodology",
+            "https://cdm.unfccc.int/methodologies/DB/KHK371SOJH99Z35OBUWUTWZ9KMW9YN",
+        )
 
 
 class FinancialTool: