diff --git a/docs/process_ember_data.md b/docs/process_ember_data.md
new file mode 100644
index 0000000..d31ead7
--- /dev/null
+++ b/docs/process_ember_data.md
@@ -0,0 +1,23 @@
+# Overview
+
+The Ember provider embeds their dataset in the grid-intensity CLI. The data
+uses ISO 3 char country codes. However we want to also support 2 char ISO codes.
+
+Ideally this will be added by Ember in a future release. Until then we can use a
+simple Go program in the `hack` directory.
+
+## Processing the data
+
+- From the root of this repo call the program.
+
+```
+go run hack/country_codes.go ember-input.csv > ember-output.csv
+```
+
+- Update the data file in the `ember` directory. e.g. co2-intensities-ember-2021.csv
+- If the data has already been processed an error will be returned. 
+
+```
+go run hack/country_codes.go /tmp/ember-output.csv
+panic: data already processed - `country_code_iso_2` should not be present
+```
diff --git a/hack/countries.csv b/hack/countries.csv
new file mode 100644
index 0000000..2d3aa05
--- /dev/null
+++ b/hack/countries.csv
@@ -0,0 +1,285 @@
+country_name,country_code_iso_2,country_code_iso_3
+Argentina,AR,ARG
+Armenia,AM,ARM
+Australia,AU,AUS
+Austria,AT,AUT
+Azerbaijan,AZ,AZE
+Burundi,BI,BDI
+Belgium,BE,BEL
+Bangladesh,BD,BGD
+Bulgaria,BG,BGR
+Bosnia Herzegovina,BA,BIH
+Belarus,BY,BLR
+Bolivia,BO,BOL
+Brazil,BR,BRA
+Canada,CA,CAN
+Switzerland,CH,CHE
+Chile,CL,CHL
+China,CN,CHN
+Costa Rica,CR,CRI
+Cyprus,CY,CYP
+Czechia,CZ,CZE
+Germany,DE,DEU
+Denmark,DK,DNK
+Ecuador,EC,ECU
+Egypt,EG,EGY
+Spain,ES,ESP
+Estonia,EE,EST
+Finland,FI,FIN
+France,FR,FRA
+United Kingdom,GB,GBR
+Georgia,GE,GEO
+Greece,GR,GRC
+Croatia,HR,HRV
+Hungary,HU,HUN
+India,IN,IND
+Ireland,IE,IRL
+Italy,IT,ITA
+Japan,JP,JPN
+Kazakhstan,KZ,KAZ
+Kenya,KE,KEN
+South Korea,KR,KOR
+Lithuania,LT,LTU
+Luxembourg,LU,LUX
+Latvia,LV,LVA
+Moldova,MD,MDA
+Mexico,MX,MEX
+North Macedonia,MK,MKD
+Malta,MT,MLT
+Montenegro,ME,MNE
+Mongolia,MN,MNG
+Netherlands,NL,NLD
+Norway,NO,NOR
+Pakistan,PK,PAK
+Peru,PE,PER
+Philippines (the),PH,PHL
+Poland,PL,POL
+Portugal,PT,PRT
+Romania,RO,ROU
+Russian Federation (the),RU,RUS
+Saudi Arabia,SA,SAU
+Senegal,SN,SEN
+Singapore,SG,SGP
+El Salvador,SV,SLV
+Serbia,RS,SRB
+Slovakia,SK,SVK
+Slovenia,SI,SVN
+Sweden,SE,SWE
+Thailand,TH,THA
+Tajikistan,TJ,TJK
+Tunisia,TN,TUN
+Turkey,TR,TUR
+Taiwan (Province of China),TW,TWN
+Ukraine,UA,UKR
+United States of America,US,USA
+Viet Nam,VN,VNM
+South Africa,ZA,ZAF
+Aruba,AW,ABW
+Afghanistan,AF,AFG
+Angola,AO,AGO
+Albania,AL,ALB
+United Arab Emirates,AE,ARE
+Argentina,AR,ARG
+Armenia,AM,ARM
+American Samoa,AS,ASM
+Antigua and Barbuda,AG,ATG
+Australia,AU,AUS
+Austria,AT,AUT
+Azerbaijan,AZ,AZE
+Burundi,BI,BDI
+Belgium,BE,BEL
+Benin,BJ,BEN
+Burkina Faso,BF,BFA
+Bangladesh,BD,BGD
+Bulgaria,BG,BGR
+Bahrain,BH,BHR
+Bahamas (the),BS,BHS
+Bosnia Herzegovina,BA,BIH
+Belarus,BY,BLR
+Belize,BZ,BLZ
+Bolivia,BO,BOL
+Brazil,BR,BRA
+Barbados,BB,BRB
+Brunei Darussalam,BN,BRN
+Bhutan,BT,BTN
+Botswana,BW,BWA
+Central African Republic (the),CF,CAF
+Canada,CA,CAN
+Switzerland,CH,CHE
+Chile,CL,CHL
+China,CN,CHN
+Cote d'Ivoire,CI,CIV
+Cameroon,CM,CMR
+Congo (the Democratic Republic of the),CD,COD
+Congo (the),CG,COG
+Cook Islands (the),CK,COK
+Colombia,CO,COL
+Comoros (the),KM,COM
+Cabo Verde,CV,CPV
+Costa Rica,CR,CRI
+Cuba,CU,CUB
+Cayman Islands (the),KY,CYM
+Cyprus,CY,CYP
+Czechia,CZ,CZE
+Germany,DE,DEU
+Djibouti,DJ,DJI
+Dominica,DM,DMA
+Denmark,DK,DNK
+Dominican Republic (the),DO,DOM
+Algeria,DZ,DZA
+Ecuador,EC,ECU
+Egypt,EG,EGY
+Eritrea,ER,ERI
+Spain,ES,ESP
+Estonia,EE,EST
+Ethiopia,ET,ETH
+Finland,FI,FIN
+Fiji,FJ,FJI
+Falkland Islands (the) [Malvinas],FK,FLK
+France,FR,FRA
+Faroe Islands (the),FO,FRO
+Gabon,GA,GAB
+United Kingdom,GB,GBR
+Georgia,GE,GEO
+Ghana,GH,GHA
+Guinea,GN,GIN
+Guadeloupe,GP,GLP
+Gambia (the),GM,GMB
+Guinea-Bissau,GW,GNB
+Equatorial Guinea,GQ,GNQ
+Greece,GR,GRC
+Grenada,GD,GRD
+Greenland,GL,GRL
+Guatemala,GT,GTM
+French Guiana,GF,GUF
+Guam,GU,GUM
+Guyana,GY,GUY
+Hong Kong,HK,HKG
+Honduras,HN,HND
+Croatia,HR,HRV
+Haiti,HT,HTI
+Hungary,HU,HUN
+Indonesia,ID,IDN
+India,IN,IND
+Ireland,IE,IRL
+Iran (Islamic Republic of),IR,IRN
+Iraq,IQ,IRQ
+Iceland,IS,ISL
+Israel,IL,ISR
+Italy,IT,ITA
+Jamaica,JM,JAM
+Jordan,JO,JOR
+Japan,JP,JPN
+Kazakhstan,KZ,KAZ
+Kenya,KE,KEN
+Kyrgyzstan,KG,KGZ
+Cambodia,KH,KHM
+Kiribati,KI,KIR
+Saint Kitts and Nevis,KN,KNA
+South Korea,KR,KOR
+Kuwait,KW,KWT
+Lao People's Democratic Republic (the),LA,LAO
+Lebanon,LB,LBN
+Liberia,LR,LBR
+Libya,LY,LBY
+Saint Lucia,LC,LCA
+Sri Lanka,LK,LKA
+Lesotho,LS,LSO
+Lithuania,LT,LTU
+Luxembourg,LU,LUX
+Latvia,LV,LVA
+Macao,MO,MAC
+Morocco,MA,MAR
+Moldova,MD,MDA
+Madagascar,MG,MDG
+Maldives,MV,MDV
+Mexico,MX,MEX
+North Macedonia,MK,MKD
+Mali,ML,MLI
+Malta,MT,MLT
+Myanmar,MM,MMR
+Montenegro,ME,MNE
+Mongolia,MN,MNG
+Mozambique,MZ,MOZ
+Mauritania,MR,MRT
+Montserrat,MS,MSR
+Martinique,MQ,MTQ
+Mauritius,MU,MUS
+Malawi,MW,MWI
+Malaysia,MY,MYS
+Namibia,NA,NAM
+New Caledonia,NC,NCL
+Niger (the),NE,NER
+Nigeria,NG,NGA
+Nicaragua,NI,NIC
+Netherlands,NL,NLD
+Norway,NO,NOR
+Nepal,NP,NPL
+Nauru,NR,NRU
+New Zealand,NZ,NZL
+Oman,OM,OMN
+Pakistan,PK,PAK
+Panama,PA,PAN
+Peru,PE,PER
+Philippines (the),PH,PHL
+Papua New Guinea,PG,PNG
+Poland,PL,POL
+Puerto Rico,PR,PRI
+Korea (the Democratic People's Republic of),KP,PRK
+Portugal,PT,PRT
+Paraguay,PY,PRY
+"Palestine, State of",PS,PSE
+French Polynesia,PF,PYF
+Qatar,QA,QAT
+Reunion,RE,REU
+Romania,RO,ROU
+Russian Federation (the),RU,RUS
+Rwanda,RW,RWA
+Saudi Arabia,SA,SAU
+Sudan (the),SD,SDN
+Senegal,SN,SEN
+Singapore,SG,SGP
+Solomon Islands,SB,SLB
+Sierra Leone,SL,SLE
+El Salvador,SV,SLV
+Somalia,SO,SOM
+Saint Pierre and Miquelon,PM,SPM
+Serbia,RS,SRB
+South Sudan,SS,SSD
+Sao Tome and Principe,ST,STP
+Suriname,SR,SUR
+Slovakia,SK,SVK
+Slovenia,SI,SVN
+Sweden,SE,SWE
+Eswatini,SZ,SWZ
+Seychelles,SC,SYC
+Syrian Arab Republic (the),SY,SYR
+Turks and Caicos Islands (the),TC,TCA
+Chad,TD,TCD
+Togo,TG,TGO
+Thailand,TH,THA
+Tajikistan,TJ,TJK
+Turkmenistan,TM,TKM
+Tonga,TO,TON
+Trinidad and Tobago,TT,TTO
+Tunisia,TN,TUN
+Turkey,TR,TUR
+Taiwan (Province of China),TW,TWN
+"Tanzania, the United Republic of",TZ,TZA
+Uganda,UG,UGA
+Ukraine,UA,UKR
+Uruguay,UY,URY
+United States of America,US,USA
+Uzbekistan,UZ,UZB
+Saint Vincent and the Grenadines,VC,VCT
+Venezuela (Bolivarian Republic of),VE,VEN
+Virgin Islands (British),VG,VGB
+Virgin Islands (U.S.),VI,VIR
+Viet Nam,VN,VNM
+Vanuatu,VU,VUT
+Samoa,WS,WSM
+Kosovo,XK,XKX
+Yemen,YE,YEM
+South Africa,ZA,ZAF
+Zambia,ZM,ZMB
+Zimbabwe,ZW,ZWE
\ No newline at end of file
diff --git a/hack/country_codes.go b/hack/country_codes.go
new file mode 100644
index 0000000..192cc72
--- /dev/null
+++ b/hack/country_codes.go
@@ -0,0 +1,108 @@
+package main
+
+import (
+	"encoding/csv"
+	"fmt"
+	"os"
+	"strings"
+)
+
+const (
+	countryCode     = "country_code"
+	countryCodeISO2 = "country_code_iso_2"
+	countryCodeISO3 = "country_code_iso_3"
+)
+
+func main() {
+	err := mapCountryCodes(os.Args[1])
+	if err != nil {
+		panic(err)
+	}
+}
+
+// mapCountryCodes takes in an Ember data file with country_code and 3 char
+// ISO codes. The data is transformed to have both 2 and 3 char ISO codes so
+// users of the CLI can use either format.
+func mapCountryCodes(inputFile string) error {
+	countries, err := getCountryLookups()
+	if err != nil {
+		return err
+	}
+
+	data, err := os.Open(inputFile)
+	if err != nil {
+		return err
+	}
+
+	rows, err := csv.NewReader(data).ReadAll()
+	if err != nil {
+		return err
+	}
+
+	err = updateHeader(rows[0])
+	if err != nil {
+		return err
+	}
+
+	// Skip header row as it is output by updateHeader.
+	rows = rows[1:]
+
+	for _, row := range rows {
+		iso_3 := row[0]
+		iso_2, ok := countries[iso_3]
+		if !ok {
+			if iso_3 != "" {
+				return fmt.Errorf("country %#q not found", iso_3)
+			}
+		}
+
+		output := []string{
+			iso_2,
+		}
+		output = append(output, row...)
+
+		fmt.Println(strings.Join(output, ","))
+	}
+
+	return nil
+}
+
+func getCountryLookups() (map[string]string, error) {
+	countries := map[string]string{}
+
+	data, err := os.Open("hack/countries.csv")
+	if err != nil {
+		return nil, err
+	}
+
+	rows, err := csv.NewReader(data).ReadAll()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, row := range rows {
+		iso_2 := row[1]
+		iso_3 := row[2]
+		countries[iso_3] = iso_2
+	}
+
+	return countries, nil
+}
+
+func updateHeader(header []string) error {
+	if header[0] == countryCodeISO2 {
+		return fmt.Errorf("data already processed - %#q should not be present", countryCodeISO2)
+	} else if header[0] == countryCode {
+		output := []string{
+			countryCodeISO2,
+		}
+		header[0] = countryCodeISO3
+		output = append(output, header...)
+
+		fmt.Println(strings.Join(output, ","))
+	} else {
+		return fmt.Errorf("header %#q not recognized", header)
+	}
+
+	return nil
+}