Energy & Efficiency Estimator.
Indicative energy reduction for a BMS-driven energy upgrade plus daylight-harvesting LED retrofit — kWh saved, percent energy reduction and CO₂ avoided. Conservative model; defensible numbers; designed for the first board conversation. Pricing follows a written estimate after review.
- Energy reduction
- 22–28%
- LED dimming range
- 30–60%
- Effectiveness
- 92%
- Model basis
- Measured kWh
— Energy · BMS & lighting retrofit · BEE / ECBC / ASHRAE 90.1 / CEA
The energy case, in plain numbers.
Use-type Energy Performance Indices from BEE ECBC 2017 + GRIHA v3, BMS savings calibrated to ASHRAE 90.1 retrofit studies, CO₂ tied to CEA grid emission factor. Defensible at board level; pricing follows a written estimate after review.
Energy readiness · Office (12-hr / corporate)
19% energy reduction potential
73,440 kWh / yr of an estimated 3,94,838 kWh / yr baseline — at 85 kWh / m² · yr energy intensity. Indicative energy planning, not a quotation.
Annual energy (baseline)
3,94,838 kWh
at 85 kWh / m² · yr
Energy saving potential
73,440 kWh / yr
≈ 19% of consumption
CO₂ avoided
52 t / yr
CEA grid · 0.71 kg / kWh
Reduction potential
19%
controls + lighting + scheduling
- BMS / HVAC saving34,746 kWh
- Lighting retrofit24,875 kWh
- Tariff / PF optimisation13,819 kWh
- CO₂ avoided52 t / yr
Assumptions driving this recommendation↓ expand
- EPI band source
- BEE ECBC 2017 · GRIHA v3
- EPI applied
- 85 kWh / m² · yr
- HVAC share
- 55%
- Lighting share
- 18%
- BMS savings (ASHRAE 90.1)
- 16% of HVAC load
- LED + harvesting
- 35% of lighting load
- Tariff / PF
- 3.5% of total load
- CO₂ factor (CEA grid)
- 0.71 kg / kWh
- Standards cited
- BEE ECBC · GRIHA · ASHRAE 90.1 · CEA
Engineering caveats
- HVAC dominates this use-type's energy — the controls layer (BMS sequencing, schedules, setpoint discipline) carries most of the achievable saving; metering and a baseline survey calibrate the real figure.
Operationally sensible ecosystem
Brands grouped by engineering role — not random logos.
BMS platform
BACnet / Niagara orchestration
- Honeywell EBIMid-enterprise BMS
- Delta enteliWEBWeb-based mid-enterprise
Lighting & control
Backbone bus, keypads, drivers, dimming
- Lutron HomeWorksReference residential bus
- KNX (ABB / Gira)European hardwired standard
- RakoBritish keypad lineage
UPS / power conditioning
Single + 3-phase + transfer
- APC Symmetra LXModular 3-phase mid
- Vertiv Liebert APMModular 3-phase mid
Indicative — modelled against BEE ECBC 2017 EPI bands and ASHRAE 90.1 retrofit savings ratios. A site audit calibrates against actual consumption, building envelope, weather profile and existing condition. Pricing and commercial payback follow a written estimate after technical review.
Translate into a briefPricing · written estimate after review
Need a price for this scope?
Share your drawings, BOQ or project brief on WhatsApp/call +91 88110 34444 or email info@technoguru.in for a written estimate after review. Pricing depends on drawings, site conditions, system scope, brand selection, cabling stage, integration depth, commissioning, logistics, GST, approvals and support expectations — so we prepare it per project after a technical review rather than publishing standard rates.
Size battery storage for the loadEnergy readiness report
Print-styled energy brief, ready to circulate.
Opens in a new tab — save as PDF via your browser, or email it to yourself via the gate below. Energy figures only; pricing follows a written estimate after review.
· Engineering advisory · Energy Estimator
What the energy-reduction figure actually represents.
The 22-28 percent energy reduction is the model's headline output, but the four notes below frame what the reduction depends on, where it gets eaten, and the operational discipline needed to realise it.
Deployment observations
- The 22-28 percent annual energy reduction comes from controls, not behaviour — sensor-driven HVAC scheduling, occupancy-based lighting, daylight harvesting in perimeter zones, plug-load control on shared circuits. The model deliberately assumes zero behavioural reduction; that is the discipline that makes the figure defensible.
- Daylight harvesting in perimeter zones is the highest single contributor — Indian commercial buildings receive enough perimeter daylight that overhead lighting can dim 30-60 percent during working hours without occupant perception. The retrofit is modest in scope; the kWh reduction compounds for the fixture's life.
- BMS effectiveness floors at 92 percent on the conservative model — the missing 8 percent covers commissioning gaps, sensor drift, occupant overrides and the inevitable manual schedule changes during the first year of operations. Specify a six-month re-commissioning visit in the AMC contract.
Operational notes
- Sensor calibration drifts at 3-5 percent per year on PIR / LUX / CO₂ sensors. Schedule a half-day annual sensor sweep — without it, the BMS scheduling logic gradually drifts from energy-optimal towards occupant-optimal, eating 4-6 percent of the energy reduction per year.
- The dashboard reporting is the political artefact, not the technical artefact — monthly energy reports to the FM team are what keeps the reduction honest. Without reporting cadence, the reduction is recoverable but not visible, and the next planning round forgets the upgrade.
Lifecycle implications
- LED fixture L70 life is 50,000-70,000 hours nominal — 14-20 years at office hours. The retrofit holds its kWh reduction across that whole window. The BMS hardware refresh window is 8-12 years; the LED fixtures outlive two BMS generations.
- Energy intensity, not tariff, is what the model reports — the percent kWh reduction holds whatever the tariff does. The model uses measured baseline consumption as the floor; the realised reduction tracks the building's actual load, not the bill.
· Example use
A 60,000 sq ft commercial office running fluorescent lighting and standalone HVAC controls lands on a 22 to 28 percent annual energy reduction when retrofitted with a BMS-driven control layer plus daylight-harvesting LED. The kWh reduction declines slightly across the decade as devices age. The model assumes nothing about behavioural change — the reduction comes from controls, not from staff. Pricing follows a written estimate after review.
· Frequently asked
The energy case —
what people ask first.
What is included in the BMS scope?
Sensor-driven HVAC scheduling, occupancy-based lighting, daylight harvesting in perimeter zones, plug-load control on shared circuits and a head-end dashboard with monthly reporting. Tenant fit-out lighting is excluded unless commissioned together.
Why daylight harvesting specifically?
Because perimeter zones in Indian commercial buildings receive enough daylight that overhead lighting can dim by 30 to 60 percent during working hours without an occupant noticing. The retrofit is modest in scope; the kWh reduction compounds for the lifetime of the fixture.
How conservative are the numbers?
We use measured baseline consumption, ten percent annual capacity fade on lighting, no behavioural-reduction assumption, and a flat 92 percent BMS effectiveness factor. The energy reduction is calibrated against the site's measured kWh, load profile and operating discipline before any figure is reported.
Will the retrofit qualify for any incentive?
BEE, EESL and several state DISCOMs run rebate or financing programmes for energy-efficiency retrofits; some MNCs run internal sustainability programmes for aligned projects. We do not include incentives in the base energy case — they sweeten the result, they do not justify it.
Is this for new buildings or retrofits?
Primarily retrofits — the energy case is sharpest where you can compare a real "before" consumption baseline. For new buildings, we run a different model that compares the BMS-driven design against a code-minimum baseline and shows the lifecycle energy-intensity difference.
· Begin
Building an energy case
for the board?
Send twelve months of bills, the building drawings and the operating profile. We will return a written energy-reduction model within two working days, with pricing following a written estimate after review.