— Energy Readiness · Commercial / office
40,000 sq ft office: ~59,000 kWh/yr addressable
Problem. A facilities lead planning an LED-and-controls retrofit on a 40,000 sq ft, 12-hour corporate office needs a defensible first-pass on how much annual electricity a coordinated upgrade could realistically address. The question is not a slogan but a number: how many kWh a year are actually in play before anyone commissions a detailed audit.
Answer. At an office energy-performance index of 85 kWh/m²/yr across ~3,716 m², this configuration models a baseline of roughly 316,000 kWh/yr, of which about 18.6 percent — close to 59,000 kWh/yr — is addressable through HVAC, lighting and scheduling measures. That saving band carries roughly 42 tonnes of CO₂ a year at the CEA grid factor of 0.71 kg/kWh.
02 / In depth
How this preset reads — the engineering view.
The model applies a BEE-style energy-performance index (EPI) to floor area and an operating-hours factor. For a 12-hour office the midpoint EPI is 85 kWh/m²/yr, split at roughly 55 percent HVAC and 18 percent lighting. The addressable band is built from three ASHRAE 90.1 / BEE midpoints — 16 percent of the HVAC load, 35 percent of the lighting load, and 3.5 percent of the total for power-factor and scheduling — which together resolve to about 18.6 percent for this use-mix.
Here the 40,000 sq ft input converts to ~3,716 m² (÷ 10.7639). Multiplying 85 × 3,716 gives a baseline near 316,000 kWh/yr; 18.6 percent of that is close to 59,000 kWh/yr addressable, carrying roughly 42 tonnes of CO₂ a year. The headline figure is the absolute kWh — that is the number that scales with floor area and hours — while the 18.6 percent is a property of the office use-mix alone.
Increasing floor area or operating hours raises the absolute kWh in play monotonically, because both enlarge the baseline the percentages act on. The percentage itself barely moves with size — it shifts only when the use-type changes the HVAC-versus-lighting split — so a larger office shows a much larger kWh headline at a near-identical percentage. Read the two figures separately: area drives the kWh, use-mix drives the percentage.
The tool is a screening estimate, not a measured saving. It does not model the actual installed plant, control strategy, envelope condition, tariff structure or occupancy schedule, and it does not stand in for a metered energy audit. Treat the output as a shortlisting figure that tells you whether a detailed HVAC and lighting study is worth commissioning — not as a commitment to a specific outcome.
What this preset deliberately does not solve
- Screening estimate from EPI midpoints — not a metered saving or an audit result.
- Ignores installed plant, controls, envelope, tariff and real occupancy patterns.
- The percentage reflects the office use-mix only; the kWh headline scales with area and hours.
How this preset differs from its siblings
The sibling hospital preset models a far higher EPI (340 vs 85 kWh/m²/yr) over a larger, 24×7 footprint, so it shows a much larger absolute kWh saving at a slightly lower percentage. Use this office preset for a daytime commercial building where lighting and HVAC dominate and a retrofit is the main lever; use the hospital preset where round-the-clock operation and clinical loads set the baseline.
03 / Hydrated calculator
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— 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)
58,752 kWh / yr saving potential
≈ 19% of an estimated 3,15,871 kWh / yr baseline — at 85 kWh / m² · yr energy intensity. The saving scales with floor area and operating hours; the percentage reflects the building use-mix. Indicative energy planning, not a quotation.
Annual energy (baseline)
3,15,871 kWh
at 85 kWh / m² · yr
Energy saving potential
58,752 kWh / yr
≈ 19% of consumption
CO₂ avoided
42 t / yr
CEA grid · 0.71 kg / kWh
- BMS / HVAC saving27,797 kWh
- Lighting retrofit19,900 kWh
- Tariff / PF optimisation11,055 kWh
- CO₂ avoided42 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.
A planning link that reopens this exact configuration — not a quote.
Pricing · 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.
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