Transparency

Data Sources

See what each calculator uses, when it was reviewed, and whether it is verified, estimated, pending, or entered by you.

Electricity

State domestic electricity tariffs

Verified data

Source: State regulators and DISCOM tariff documents
Effective date: State-specific; shown in calculator
Last reviewed: 2026-09-20
Used by: Electricity Bill

Production calculations are enabled for Telangana, Andhra Pradesh, Karnataka, Maharashtra, Kerala, and Delhi base tariffs. Delhi dynamic adjustments remain date/DISCOM-specific; Tamil Nadu remains disabled.

Custom electricity rate

User provided

Source: User-entered rate
Effective date: Not applicable / pending
Last reviewed: 2026-09-20
Used by: Electricity Bill, Appliance Cost, AC Cost, Solar ROI, EV Charging

Available for unsupported, disabled, expired, or user-specific tariffs. No state rate is silently substituted.

Appliances

Generic household wattage ranges

Estimate

Source: TechVodka planning estimates
Effective date: 2026-09-19
Last reviewed: 2026-09-19
Used by: Appliance Running Cost

Users can override every wattage. Product nameplates and energy labels take precedence.

Solar

General India solar generation and roof assumptions

Estimate

Source: TechVodka general planning assumptions
Effective date: 2026-09-19
Last reviewed: 2026-09-19
Used by: Solar Size, Solar ROI, Solar + EV

Not city-level irradiation or a site survey. Shading, orientation and equipment change output.

Installed solar market costs

Pending verification

Source: Pending current market-source verification
Effective date: Not applicable / pending
Last reviewed: 2026-09-19
Used by: Solar Cost

No market price is published. Users enter a rate range or installer quote.

PM Surya Ghar central CFA

Verified data

Source: MNRE PM Surya Ghar CFA guidelines
Effective date: 2024-02-13 to 2027-03-31
Last reviewed: 2026-09-20
Used by: Solar Subsidy, Solar Cost, Solar ROI

The calculator applies the central household CFA tiers for normal or listed special-category states. Final approval and separate state incentives are not inferred.

Delhi state solar policy

Verified data

Source: Delhi Solar Portal
Effective date: Current policy snapshot
Last reviewed: 2026-09-20
Used by: Solar Subsidy reference

The state benefit is documented separately and is not automatically added to the central CFA estimate because portal eligibility must be confirmed.

EV

Custom EV specifications

User provided

Source: User-entered vehicle values
Effective date: Not applicable / pending
Last reviewed: 2026-09-19
Used by: EV Charging, EV vs Petrol/Diesel, Solar + EV

No unverified model specification or vehicle price is published.

Fuel/vehicle data

Fuel price, mileage, maintenance and insurance

User provided

Source: User-entered values
Effective date: Not applicable / pending
Last reviewed: 2026-09-19
Used by: EV vs Petrol/Diesel

Current prices vary by location and date; future escalation defaults to zero.