Understand how your facility uses energy, identify potential efficiency improvements, and develop a practical action plan. IISE provides a technical approach to energy audit and energy-efficiency consultancy for industrial and commercial facilities, with the assessment scope tailored to your operational requirements.
Energy is frequently one of the largest controllable operational expenses for manufacturing plants and commercial properties. Yet without systematic measurement, inefficiencies remain invisible within overall utility bills.
From rapid walkthrough assessments to multi-point detailed audits and ISO 50001 systems consultancy, IISE scopes every engagement around your facility's technical systems, operating realities, and commercial objectives.
A rapid, systematic diagnostic assessment designed to establish baseline energy patterns, identify obvious operational losses, and determine whether a deeper technical audit is economically justified.
A comprehensive engineering evaluation involving portable instrumentation, multi-point measurement, system-level energy balancing, and technically prioritised energy conservation measures (ECMs).
A rigorous techno-economic assessment focused on capital-intensive energy projects requiring financial justification, sensitivity analysis, risk evaluation, and investment-grade documentation.
Targeted engineering advisory services addressing specialized industrial process inefficiencies, production schedule optimization, and cross-cutting utility system performance.
Detailed technical inspection of the facility electrical distribution network, transformer loading, cable I²R losses, power factor management, and phase load balancing.
Engineering evaluation of thermal utilities, fuel consumption, combustion efficiency, steam generation, steam distribution, trap performance, and condensate recovery.
In-depth efficiency analysis of central chilled water systems, VRF units, primary/secondary pumps, cooling towers, air handling units (AHUs), and building envelope heat gain.
Field measurement and operating point analysis for rotating equipment, comparing actual operating duty against best efficiency points (BEP) and design ratings.
High-resolution logging of voltage and current harmonics (THD-V, THD-I), voltage sags, swells, transients, and neutral conductor loading caused by non-linear loads.
Deployment of multi-channel digital power loggers to capture granular, time-synchronised energy profiles across departments, production shifts, and individual high-draw machines.
Non-destructive thermographic scanning to detect thermal anomalies, electrical switchgear overheating, loose terminal connections, refractory degradation, and building envelope thermal bridging.
Technical assessment of on-site rooftop and ground-mounted solar PV potential, matching generation profiles directly against audited facility hourly demand curves.
Technical modelling of hybrid clean energy systems combining solar PV with battery energy storage systems (BESS) for peak shaving, demand charge mitigation, and critical backup.
Consultancy support to design, document, implement, and maintain an Energy Management System (EnMS) aligned with the ISO 50001:2018 standard framework.
Advisory consultancy for designated industrial consumers navigating energy consumption norms, reporting formats, and target-setting frameworks aligned with Bureau of Energy Efficiency principles.
Consultancy on building energy design compliance, daylighting, fenestration, building envelope thermal performance, and HVAC efficiency requirements under ECBC and state energy codes.
Energy consumption characteristics differ fundamentally between industrial manufacturing operations and commercial buildings. We establish distinct diagnostic pathways for each.
Designed for heavy manufacturing plants, process industries, engineering fabrication shops, foundries, chemical processors, and logistics depots where operating uptime and specific production costs dictate commercial survival.
Tailored for corporate office parks, commercial towers, healthcare facilities, luxury hotels, educational campuses, and institutional buildings where indoor environmental quality, thermal comfort, and high HVAC usage are central.
Energy audits are conducted at different degrees of depth depending on your facility's size, operational complexity, capital planning cycle, and decision-making requirements.
| Audit Tier | Core Objective | Assessment Depth | Measurement Requirements | Suitable Applications |
|---|---|---|---|---|
| Level 1: Preliminary / Walkthrough Audit Initial Assessment | Quickly assess the facility's overall energy use, establish high-level benchmarks, identify obvious operational waste, and determine if detailed auditing is economically justifiable. | Visual walkthrough inspection, utility bill historical review (12-24 months), tariff structure analysis, and non-invasive spot checks. | Spot measurements using handheld instruments where accessible (basic voltage, current, lux levels, visual infrared spot check). | MSMEs, smaller facilities, or large plants seeking an initial feasibility screening before commissioning capital studies. |
| Level 2: Detailed Energy Audit Most Common Scope | Provide a complete, multi-point engineering audit of all major energy-consuming systems, quantifying specific energy consumption, equipment efficiencies, and prioritized energy conservation measures. | Thorough multi-day site assessment, detailed operational data logging, equipment performance trials, and comprehensive mass/energy balances. | Multi-point electrical power logging (kW, kVA, PF, harmonics), compressor airflow & pressure logging, chiller water flow & ΔT, flue-gas combustion analysis, and thermal imaging. | Manufacturing plants, process facilities, commercial buildings, hospitals, and any facility spending > ₹25 Lakhs annually on energy. |
| Level 3: Investment-Oriented Audit Capital Projects | Deliver bankable, investment-grade documentation for major capital expenditure projects, comprehensive facility retrofits, or Energy Service Company (ESCO) performance contracting. | Extensive baseline logging over extended operating cycles, dynamic system simulation, detailed vendor equipment review, and rigorous financial risk modelling. | Long-term data logging across seasonal and production variations, precise flow and enthalpy measurements, and power quality disturbance recording. | Major chiller plant overhauls, waste heat recovery power generation, boiler replacements, and multi-megawatt captive solar/BESS installations. |
Different sectors exhibit distinct load patterns, regulatory demands, and utility architectures. We tailor our assessment methodologies to the operational priorities of your specific industry.
Key Focus: Motor loading optimization, compressed air leak management, metal cutting/forming utility synchronization, and electrical power factor.
Key Focus: Refrigeration compressor efficiency, cold room insulation integrity, steam boiler optimization, and washdown heat recovery.
Key Focus: Steam distribution systems, condensate recovery percentage, effluent treatment plant (ETP) aeration blowers, and spinning motor loads.
Key Focus: Contract demand rightsizing, power factor penalty elimination, distribution line loss reduction, and basic pneumatic leak prevention.
Key Focus: High-bay LED lighting controls, battery forklift charging infrastructure load profiles, ventilation, and rooftop solar hosting.
Key Focus: Central chiller plant kW/TR, variable refrigerant flow (VRF) staging, lighting power density, and scheduled ventilation setback.
Key Focus: Central air conditioning, hot water generation (heat pumps vs boilers), kitchen ventilation, laundry steam systems, and room occupancy sensors.
Key Focus: Cleanroom and operating theatre ventilation, positive pressure management, critical chiller reliability, and uninterruptible power losses.
Key Focus: Campus-wide HT distribution, laboratory equipment baseloads, hostel hot water systems, and solar microgrid integration.
Accurate data forms the cornerstone of effective energy engineering. Our diagnostic procedures draw upon professional, calibrated field instruments deployed selectively to match the systems under investigation.
Three-phase digital analysers record voltage, active/reactive/apparent power (kW, kVAR, kVA), power factor, frequency, and energy consumption profiles over selected operational shifts.
True-RMS digital clamp meters and multimeters assess phase current distribution, conductor loading, neutral currents, and localized voltage drops across switchboards.
Specialized harmonic meters identify total harmonic distortion in voltage and current (THD-V, THD-I) up to the 50th harmonic, verifying compliance against IEEE 519 guidelines.
Calibrated thermal imaging cameras capture non-contact surface temperature distributions to detect electrical loose connections, overloaded busbars, insulation gaps, and refractory wear.
Contact thermocouples and non-contact infrared pyrometers measure process fluid temperatures, surface temperatures, heat exchanger ΔT, and flue gas temperatures.
Precision digital illuminance meters verify lighting levels across task planes against National Building Code (NBC) and IS 3646 illumination standards to prevent over-illumination.
Digital vane and hot-wire anemometers, combined with pitot tubes and micro-manometers, determine duct velocities, AHU airflow volumes (CFM), and exhaust flow rates.
Calibrated digital pressure gauges, differential transmitters, and ultrasonic leak detectors pinpoint invisible compressed air leaks and excessive system pressure drops.
Transit-time clamp-on ultrasonic flow meters measure chilled water, condenser water, and process liquid flow rates non-invasively without interrupting piping integrity.
Electrochemical flue gas analysers measure O₂, CO, CO₂, excess air percentage, and stack temperature to calculate boiler and furnace combustion efficiency.
Multi-channel portable data loggers track continuous electrical load curves, ambient temperatures, and runtime hours across day and night operational cycles.
A successful audit follows a structured, five-stage methodology designed to ensure minimal disruption to your daily operations while delivering high-fidelity technical findings.
We discuss your facility type, geographical location, principal energy consumers, operating schedules, and commercial objectives. Together, we establish an agreed assessment scope, methodology, timeline, and boundary conditions tailored to your operational realities.
Our engineering team reviews 12 to 24 months of utility electricity and fuel bills, tariff rate structures, single-line diagrams (SLD), equipment specifications, and maintenance logs. On-site walkthroughs inspect physical configurations and operating protocols.
According to the agreed project scope, technical measurements are conducted on targeted equipment using calibrated field instruments. Our engineers construct energy balances, calculate operating efficiencies, and correlate power draw with production and occupancy rates.
We formulate a structured, technical report detailing verified baseline energy use, identified operational inefficiencies, and prioritised Energy Conservation Measures (ECMs) categorised by no-cost operational fixes, low-cost modifications, and capital-grade upgrades.
We review the audit findings in a dedicated technical debrief with your plant and facility teams, answering technical questions, helping establish project priorities, and discussing follow-up engineering advisory support as agreed in your engagement.
Having the following baseline documentation readily available substantially expedites the initial diagnostic review and enables our engineering team to focus immediately on high-value system measurements:
An energy audit deliverable is not just an inventory of equipment—it is a rigorous, decision-grade engineering document structured to guide operating maintenance, engineering retrofits, and executive capital investment.
Sound engineering recommendations must be matched by defensible financial analysis. We evaluate energy conservation opportunities across lifecycle operating costs, capital requirements, and payback sensitivity.
Centrifugal pumps and fans governed by the Affinity Laws consume power proportional to the cube of their rotational speed:
Illustrative Scenario: A 45 kW chilled water secondary pump running at full speed is throttled by a discharge valve to 85% flow requirement. By replacing valve throttling with Variable Frequency Drive (VFD) speed reduction:
As an authoritative clean energy institution, IISE combines deep renewable domain knowledge, rigorous measurement methodologies, and transparent scope definitions to deliver actionable value.
Our evaluations focus on systematic mass, thermal, and electrical energy balances grounded in verifiable measurements, avoiding arbitrary assumptions or superficial walkthrough checklists.
We formulate recommendations that respect plant operating constraints, maintenance practicalities, production cycle demands, and safety requirements to ensure feasibility.
We uniquely connect energy efficiency improvements with on-site solar PV and battery storage feasibility, ensuring facilities reduce demand before capital sizing.
Every engagement clearly documents what is evaluated, the specific measurement methods used, and boundary conditions, maintaining absolute professional clarity.
Our advisory encompasses electrical distribution, thermal steam utilities, compressed air dynamics, HVAC psychrometrics, and renewable integration in a cohesive view.
We provide objective engineering recommendations tailored to the client's financial and technical interests, backed by institutional domain knowledge.
The following representative technical models illustrate how energy conservation measures are diagnosed, measured, and quantified through disciplined engineering analysis.
Baseline Situation: An automotive component plant operating two 75 kW rotary screw compressors at 7.8 bar(g) generation pressure. Operators noted frequent compressor loading even during non-machining breaks.
Diagnostic Findings: Ultrasonic leak surveys identified 24 distinct leaks across quick-connect couplers, FRL units, and pneumatic solenoid valves, accounting for ~22% of total compressor output. Furthermore, plant equipment required only 6.2 bar(g).
Technical Interventions Evaluated:
• Systematic leak remediation program with monthly ultrasonic tagging.
• Reducing header delivery pressure from 7.8 to 6.6 bar(g) (saving ~6% compressor power based on the rule of thumb of ~7% power reduction per 1 bar drop).
• Installing localized secondary receiver tanks near intermittent high-draw stamping presses.
Baseline Situation: A multi-tenant commercial IT complex with two 400 TR water-cooled centrifugal chillers exhibiting elevated specific energy consumption of 0.88 kW/TR (against design rating of 0.62 kW/TR).
Diagnostic Findings: Chilled water return temperature differential (ΔT) was only 2.4°C instead of design 5.5°C (Low ΔT Syndrome) caused by 3-way bypassing control valves, forcing two chillers to run at low partial loading.
Technical Interventions Evaluated:
• Replacing 3-way bypass valves with 2-way pressure-independent control valves (PICVs) at terminal AHUs.
• Retrofitting VFDs on secondary chilled water pumps regulated by differential pressure sensors.
• Optimizing cooling tower fan staging and condenser water setpoint reset.
Energy efficiency in India operates within a clear legal and regulatory environment led by the Energy Conservation Act and the Bureau of Energy Efficiency (BEE), alongside international frameworks such as ISO 50001.
The Energy Conservation Act, 2001 (amended in 2022) establishes the statutory framework for energy efficiency in India, empowering the central and state governments to designate energy-intensive industries and enforce mandatory energy consumption norms.
The Bureau of Energy Efficiency (BEE) designates industrial units exceeding specific annual energy thresholds as Designated Consumers (DCs) under the Perform, Achieve and Trade (PAT) scheme, mandating specific reduction targets and mandatory accredited energy audits.
ISO 50001:2018 is the global voluntary standard providing an iterative Plan-Do-Check-Act framework for corporate energy management, establishing measurable energy baselines, indicators, and systematic governance.
Developed by BEE, ECBC sets baseline energy efficiency performance standards for commercial buildings with connected loads of 100 kW / 120 kVA or greater, covering building envelope, HVAC, lighting, and electrical systems.
State Designated Agencies monitor compliance, promote energy conservation initiatives, and enforce state-specific building energy codes and industrial efficiency regulations across their respective jurisdictions.
While Designated Consumers must comply with statutory cycles, thousands of MSMEs and commercial businesses conduct voluntary energy audits purely for commercial cost reduction, risk mitigation, and ESG alignment.
The most cost-effective kilowatt-hour is the one you do not need to generate. Combining energy efficiency with rooftop solar PV and battery storage creates a resilient, low-carbon operational foundation.
Sizing a solar PV installation or battery energy storage system (BESS) for an un-audited facility risks over-capitalising on generation to power avoidable waste.
As part of an energy assessment or dedicated renewable feasibility engagement, IISE engineers assess roof layout, structural capacity, transformer headrooms, and grid synchronization parameters.
Tell us about your organisation, facility, energy use, and assessment objectives. IISE can review your requirements and discuss an appropriate energy audit or energy-efficiency consultancy scope.
Comprehensive answers to frequently asked technical, commercial, and operational questions regarding facility energy audits in India.
Share your facility location, type of operation, energy concerns, and assessment objectives. IISE can review your requirements and discuss a suitable consultancy scope.
.iise-audit-scope. Compatible with MasterStudy WordPress theme canvas and full-width layouts. Inherits global typography and viewport settings without external dependencies.Rising energy costs eat into margins whether you run a manufacturing plant, a commercial office, an MSME unit, or a public-sector facility. IISE's Energy Audit Services team identifies exactly where energy is being wasted and gives you a clear, actionable plan to fix it — backed by the same faculty who train India's certified energy auditors.
Every engagement is scoped to your facility. We don't publish fixed pricing here because every audit is different — request a free consultation and we'll recommend the right audit level and consultancy scope for you.
From a quick walkthrough to a full investment-grade audit, we scope the engagement to what your facility actually needs.
Level 1 — Walkthrough / Preliminary Energy Audit
A fast, low-cost initial assessment to flag obvious inefficiencies and decide if a deeper audit is worthwhile.
Level 2 — Detailed / General Energy Audit
In-depth measurement and analysis of your major energy-consuming systems, with a prioritized action plan.
Level 3 — Investment-Grade Energy Audit
The most rigorous audit tier, suited to large capital decisions where precise ROI data is required.
ISO 50001 EnMS Consultancy & Certification Support
Guidance to design, implement, and certify an Energy Management System aligned to ISO 50001.
BEE PAT Scheme Compliance Support
Support for Perform, Achieve, Trade (PAT) scheme compliance and target-setting for designated consumers.
Sub-metering & Load Profiling Studies
Granular, equipment-level metering to understand exactly how and when energy is consumed.
Thermal Imaging & Infrared Inspection Surveys
Non-invasive thermal surveys to catch insulation gaps, overheating equipment, and electrical faults early.
HVAC & Building Energy Audits
Efficiency assessments for commercial and institutional HVAC, lighting, and building envelope systems.
Industrial Process Energy Optimization
Optimization studies for motors, compressors, boilers, and pumps — the biggest energy users on most factory floors.
Power Quality & Harmonics Analysis
Diagnosis of power quality issues that quietly waste energy and shorten equipment life.
Rooftop Solar Feasibility & Efficiency Audits
Feasibility studies for rooftop solar adoption. Try our free Rooftop Solar Calculator to get a quick estimate before you engage us.
EV Charging Infrastructure Energy Efficiency Audits
Efficiency and load-impact audits for facilities installing or scaling EV charging infrastructure.
Renewable Energy / Captive Solar Integration Consultancy
Consultancy on integrating captive solar and hybrid renewable systems into your existing energy mix.
ECBC Compliance Consultancy
Guidance on meeting Energy Conservation Building Code requirements for new and existing buildings.
Government Subsidy & Incentive Facilitation
Help identifying and applying for applicable state and central energy-efficiency incentive schemes.
Every audit is personally led by our expert faculty — the same team that trains India's energy professionals — so you get instructor-grade rigor, not a checklist visit.
Rajesh Unnikrishnan
Course Director
[Credential placeholder — e.g. BEE-Accredited Energy Auditor]
Dr Malwad
HOD, Renewable Energy
[Credential placeholder — e.g. ISO 50001 Lead Auditor]
Dr. Arpan Tewary
Faculty
[Credential placeholder]
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