Engineering Standards & Compliance

Standards & Regulatory Framework

Our wind technology design is based on and aligned with relevant IEC, IS, ISO, and Indian regulatory standards — ensuring engineering rigour, safety compliance, and certification-readiness at every stage.

IEC 61400-1

Wind Classification for Turbine Design

Based on IEC 61400-1 design classification principles — internationally recognized standard framework applicable in India.

Wind Classes with Turbulence Intensity — Basic Parameters

Wind Turbine Class	Reference Wind Speed (m/s)	Annual Avg Wind Speed (m/s)	Category A (I_ref)	Category B (I_ref)	Category C (I_ref)
Class I (High Wind)	50	10	0.16	0.14	0.12
Class II (Medium Wind)	42.5	8.5	0.16	0.14	0.12
Class III (Low Wind)	37.5	7.5	0.16	0.14	0.12
Class IV (Very Low Wind)	30	6	0.16	0.14	0.12
Class S (Special)	—	Values specified by designer	—	—	—

I_ref = Reference Turbulence Intensity — characteristic value of turbulence intensity at 15 m/s wind speed.

Turbulence Categories

Category	I_ref Value	Turbulence Level	Typical Site Characteristics
A	0.16	Higher	Complex terrain, obstacles, coastal areas
B	0.14	Medium	Open terrain with some obstacles
C	0.12	Lower	Offshore, open flat terrain, low roughness

Standards Guidance

Site Selection Criteria

Wind Speed

Higher wind sites need Class I; lower wind sites can use Class III or IV

Turbulence

Sites with complex terrain or obstacles need Category A (higher turbulence)

Terrain

Offshore and flat terrain typically use Category C (lower turbulence)

Extreme Events

Sites with tropical cyclones may need Class S with special parameters

Certification Authority: NIWE (as applicable)

Policy Authority: MNRE, Government of India

Common utility-scale classes in India: Class II and Class III (site-dependent)

Indicative Calculations

Engineering Calculation References

Annual Average Wind Speed

V_ave = 0.2 × V_ref

Extreme Wind Speed (50-year return)

V_e50 = 1.4 × V_ref × (z / z_hub)^0.11

Extreme Wind Speed (1-year return)

V_e1 = 0.8 × V_e50

Primary Standard Reference

IEC 61400-1:2019 — Wind Energy Generation Systems, Part 1: Design Requirements

India

Indian Standards Considered for This Technology Framework

Standard	Title	Description	Application
IS 17626 (IEC 61400-1)	Wind Turbine Generator Systems – Part 1: Design Requirements	Indian adoption of IEC 61400-1	Wind turbine design (India)
IS 875 (Part 3)	Code of Practice for Design Loads – Wind Loads	Wind load calculations	Structural design

International

Associated International & Indian Standards Considered

Our technology development framework references the following standards, codes, and engineering principles.

Section A

IEC 61400 Series (Wind Turbine Standards)

Design & Structural Standards (IEC 61400-1, 3-1, 3-2, 4, 5, 6)
Performance & Testing Standards (IEC 61400-12, 13, 23, 50)
Electrical Standards (IEC 61400-21, 25, 27)
Acoustic & Environmental (IEC 61400-11, 14, 24)
Reliability & Maintenance (IEC 61400-26, 28)
Certification (IEC 61400-22)

Section B

ISO Standards

Gearbox (ISO 81400-4)
Offshore Structures (ISO 19900, 19901, 19902)
Condition Monitoring (ISO 16079)
Lubrication (ISO 12925)

Section C

Electrical Components

Transformers (IEC 60076-16)
Generators (IEC 60034)
Power Converters
Grid Connection (IEC 61000)

Section D

Mechanical Components

Bearings (ISO 281, 76, 15243)
Bolts & Fasteners (ISO 898)
Welding (ISO 3834, 15614)
Corrosion Protection (ISO 12944)

Section E

Indian Standards

IS 17626 (IEC 61400-1 adoption)
IS 875 (Wind Loads)
IS 800, IS 456 (Structural)
NIWE Certification (Govt. of India – MNRE)
Grid Codes (IEGC, CEA)

Section F

Quality, Environmental & Safety Management

ISO 9001 framework
ISO 14001 framework
ISO 45001 framework

Green Hydrogen

Engineering Standards for Green Hydrogen Production

The following international and Indian standards are considered as part of the intended engineering, safety, quality, and design framework for green hydrogen production systems based on Alkaline and PEM electrolyzers.

Component	Reference Standards Considered
Electrolyzer	IS 16509:2020, ISO 22734, IEC 60079-10-1
Compression	API 618, API 617, ISO 19880 series (where applicable)
Storage	IS 8198, ASME Section VIII, applicable PESO requirements
Pipeline / Distribution	ASME B31.12, ASME B31.3, applicable PNGRB / gas handling requirements
Leak Detection	IS 16253:2016
Quality	IS 16061, ISO 14687
Safety	NFPA 2, ISO/TR 15916, IS 5572

Important Technical Disclaimer

The standards, classifications, formulas, and engineering references presented here indicate the intended technical design framework of the technology. Formal testing, third-party validation, statutory approvals, and certification shall be undertaken as applicable during detailed engineering, prototype development, manufacturing, and commercial project execution.