Primary first
Government, regulator, public laboratory, standards and programme owner pages are preferred.
82 global verification resources
Official government, regulator, public-research, standards and consumer-information links. They support context and verification; they are not paid backlinks, endorsements or universal local rules.
No copied tariff default
A current source is linked, while changing household rates remain user-entered.
Local scope visible
Country and jurisdiction boundaries remain attached to every resource.
12 resources
United States
USAbills
Electricity prices and rates explained
U.S. Energy Information Administration
Explains why an average price statistic is not necessarily the rate applied to the next kWh.
Open official resourceUSAbills
Electricity data hub
U.S. Energy Information Administration
Official US electricity data and rate tables; calculator rates still come from the user's tariff.
Open official resourceUSAappliances
Residential Energy Consumption Survey
U.S. Energy Information Administration
National household-energy research for context, not a substitute for a home's measurements.
Open official resourceUSAbills
State energy profiles
U.S. Energy Information Administration
State-level electricity context and official data.
Open official resourceUSAappliances
ENERGY STAR Product Finder
U.S. Environmental Protection Agency
Verify model energy information for eligible appliance categories.
Open official resourceUSAappliances
EnergyGuide labels
Federal Trade Commission
Official label guidance; use the model's label value in cost scenarios.
Open official resourceUSAsolar storage
PVWatts Calculator
National Renewable Energy Laboratory
Estimate location-specific PV production before entering a solar-generation scenario.
Open official resourceUSAconsumer
Save energy at home
U.S. Department of Energy
Independent home-efficiency guidance.
Open official resourceUSAappliances
Heat pump systems
U.S. Department of Energy
Explains heat-pump operation; the calculator's COP remains user-entered.
Open official resourceUSAbuilding
Building Energy Codes Program
U.S. Department of Energy
Current building-energy-code resources; not a structural design service.
Open official resourceUSAmeasurement
SI Units
National Institute of Standards and Technology
Official SI measurement guidance used to distinguish units.
Open official resourceUSAmeasurement
SI Units – Volume
National Institute of Standards and Technology
Verification reference for volume definitions and conversions.
Open official resource10 resources
United Kingdom
UKbills
Energy price cap unit rates and standing charges
Ofgem
Current regulator rates and regional standing-charge context.
Open official resourceUKbills
Energy price cap explained
Ofgem
Explains that the cap limits rates rather than the household's total bill.
Open official resourceUKbills
Understand electricity and gas bills
Ofgem
Official guide to common bill components.
Open official resourceUKbills
Economy 7 consumer guide
Ofgem
Time-of-use context for peak and off-peak comparisons.
Open official resourceUKconsumer
Energy Performance Certificates
UK Government
Official EPC overview for property-energy context.
Open official resourceUKbuilding
Building Regulations approved documents
UK Government
Current official guidance documents for England.
Open official resourceUKbuilding
Building regulations approval
UK Government
Explains approval responsibilities; quantity tools do not establish compliance.
Open official resourceUKsolar storage
Solar PV consumer guidance
Microgeneration Certification Scheme
Independent certification context for solar installations.
Open official resourceUKconsumer
Energy statistics
Department for Energy Security and Net Zero
Official UK energy-data collections.
Open official resourceUKappliances
Product energy labels
UK Government
Official product-labelling requirements and guidance.
Open official resource10 resources
Australia
Australiabills
Find the best energy deal
Australian Government
Explains bill comparison and the role of supply and usage charges.
Open official resourceAustraliaappliances
Understand the Energy Rating Label
Australian Government
Use label annual energy values rather than guessing from stars.
Open official resourceAustraliaappliances
Energy Rating product registration database
Australian Government
Official searchable product-performance records.
Open official resourceAustraliasolar storage
Size your solar system
Australian Government
Official planning guidance for matching solar size to household use.
Open official resourceAustraliasolar storage
Batteries
Australian Government
Battery planning and safety context; calculator losses remain editable.
Open official resourceAustraliabills
Energy Made Easy
Australian Energy Regulator
Official plan comparison service for eligible regions.
Open official resourceAustraliabills
Understanding energy bills
Australian Energy Regulator
Regulator consumer information on energy services and charges.
Open official resourceAustraliabuilding
National Construction Code for homeowners
Australian Building Codes Board
Explains how the NCC applies; material estimates do not certify compliance.
Open official resourceAustraliabuilding
Your Home technical manual
Australian Government
Independent residential design and efficiency guidance.
Open official resourceAustraliasolar storage
Small-scale renewable energy scheme
Clean Energy Regulator
Official scheme information; no rebate value is assumed by a calculator.
Open official resource10 resources
United Arab Emirates
UAEbills
Slab tariff
Dubai Electricity and Water Authority
Current Dubai electricity and water slab thresholds and rates.
Open official resourceUAEbills
DEWA tariff calculator
Dubai Electricity and Water Authority
Official comparison point for Dubai tariff calculations.
Open official resourceUAEbills
Understand your bill
Dubai Electricity and Water Authority
Official description of bill sections and charges.
Open official resourceUAEsolar storage
Shams Dubai
Dubai Electricity and Water Authority
Official distributed-solar programme context.
Open official resourceUAEsolar storage
Solar PV connection guidelines
Dubai Electricity and Water Authority
Current connection guidance; the calculator does not approve designs.
Open official resourceUAEbuilding
Building publications
Dubai Municipality
Official Dubai building publications and circulars.
Open official resourceUAEbuilding
Al Sa'fat green building system
Dubai Municipality
Official sustainable-building requirements and guidance.
Open official resourceUAEbills
Electricity and water tariff
EtihadWE
Official tariff reference for EtihadWE customers; not interchangeable with DEWA.
Open official resourceUAEbills
Residential rates and tariffs
TAQA Distribution
Abu Dhabi tariff context; customers must confirm the current applicable page.
Open official resourceUAEconsumer
Standards and conformity services
Ministry of Industry and Advanced Technology
Official UAE standards and conformity service entry point.
Open official resource8 resources
Canada
Canadaappliances
EnerGuide label
Natural Resources Canada
Official appliance and equipment energy-label guidance.
Open official resourceCanadaconsumer
Energy efficiency for homes
Natural Resources Canada
Federal home-energy guidance and programmes.
Open official resourceCanadaappliances
Energy efficiency regulations
Natural Resources Canada
Official regulated-product information.
Open official resourceCanadaappliances
Energy efficiency ratings search
Natural Resources Canada
Model-level energy performance search.
Open official resourceCanadasolar storage
Photovoltaic potential and solar resource maps
Natural Resources Canada
Location-specific solar-resource tools and data.
Open official resourceCanadabuilding
Canada's national model codes
National Research Council Canada
Official model-code entry point; local adoption must be checked.
Open official resourceCanadameasurement
Measurement Canada
Innovation, Science and Economic Development Canada
Official measurement oversight and consumer information.
Open official resourceCanadaconsumer
Household energy use statistics
Statistics Canada
Official energy statistics for context, not household-rate defaults.
Open official resource8 resources
European Union
EUappliances
Energy-efficient products
European Commission
Official ecodesign and energy-label product information.
Open official resourceEUappliances
European Product Registry for Energy Labelling
European Commission
Verify registered model label information.
Open official resourceEUappliances
Understanding the Energy Label
European Commission
Explains label meaning and product scope.
Open official resourceEUsolar storage
Photovoltaic Geographical Information System
European Commission Joint Research Centre
Location-specific PV production estimates for user-entered solar scenarios.
Open official resourceEUbuilding
Energy performance of buildings
European Commission
EU building-energy policy context; national implementation must be checked.
Open official resourceEUconsumer
Protecting and empowering energy consumers
European Commission
Official consumer-rights information.
Open official resourceEUbills
Electricity market design
European Commission
Official market-design context, not a retail-rate database.
Open official resourceEUmeasurement
Legal metrology
European Commission
EU measurement-law context.
Open official resource8 resources
New Zealand
New Zealandconsumer
Home energy upgrades calculator
Energy Efficiency and Conservation Authority
Independent upgrade-planning resource.
Open official resourceNew Zealandappliances
Energy rating labels
Energy Efficiency and Conservation Authority
Official consumer explanation of product energy labels.
Open official resourceNew Zealandbills
Your power bill
Electricity Authority
Consumer guide to New Zealand bill components.
Open official resourceNew Zealandbills
Powerswitch
Consumer NZ
Independent electricity plan comparison supported by the Electricity Authority.
Open official resourceNew Zealandbuilding
Building Code
Ministry of Business, Innovation and Employment
Official compliance documents; a quantity estimate is not building consent.
Open official resourceNew Zealandmeasurement
Measurement standards
Measurement Standards Laboratory of New Zealand
National measurement standards reference.
Open official resourceNew Zealandsolar storage
Plan your home solar system
Energy Efficiency and Conservation Authority
Independent solar planning guidance.
Open official resourceNew Zealandappliances
Energy efficiency regulations
Energy Efficiency and Conservation Authority
Current regulated-product information.
Open official resource8 resources
Singapore
Singaporebills
Regulated electricity tariff
Energy Market Authority
Current regulated-tariff explanation; the user must enter the applicable rate.
Open official resourceSingaporeconsumer
Electricity consumer information
Energy Market Authority
Official electricity-market and consumer guidance.
Open official resourceSingaporeappliances
Mandatory Energy Labelling Scheme
National Environment Agency
Official appliance-label scheme and covered products.
Open official resourceSingaporeappliances
Household energy-efficiency resources
National Environment Agency
Official household guidance for comparing appliance energy use and labels.
Open official resourceSingaporebuilding
Building and construction regulations
Building and Construction Authority
Official building-control entry point.
Open official resourceSingaporebuilding
Green Mark certification scheme
Building and Construction Authority
Building-efficiency context and scheme information.
Open official resourceSingaporemeasurement
Property data and statistics
Urban Redevelopment Authority
Official property-data context; listings still require explicit unit checks.
Open official resourceSingaporesolar storage
Solar energy
Energy Market Authority
Official Singapore solar-energy context.
Open official resource8 resources
International standards and research
Globalmeasurement
The International System of Units
Bureau International des Poids et Mesures
Primary international reference for SI units.
Open official resourceGlobalmeasurement
IEC Electropedia
International Electrotechnical Commission
Authoritative electrical terminology reference.
Open official resourceGlobalbuilding
Buildings
International Energy Agency
Global building-energy evidence and policy context.
Open official resourceGlobalsolar storage
Solar PV
International Energy Agency
Global solar evidence; not a local-yield assumption.
Open official resourceGlobalsolar storage
Solar energy
International Renewable Energy Agency
International renewable-energy research and technology context.
Open official resourceGlobalmeasurement
Area conversion factors
National Institute of Standards and Technology
Standard area relationships for the property translator.
Open official resourceGlobalconsumer
Electric power consumption data
World Bank
Cross-country context only; never a household tariff.
Open official resourceGlobalbuilding
Global Alliance for Buildings and Construction
United Nations Environment Programme
International building-sector research and decarbonisation context.
Open official resource