Buildings Guide

Suzlon One Earth Campus

Ultra-Low-Energy Building
Year 2009
Municipality Hadaspar
Location Pune, India | OSM
State Maharashtra
Area (TFA) 70865 m2
Dwellings None
Cost None EUR/m2
Consumption 79.3 kWh/m2/year (primary energy)
Specific Primary Energy Demand in KWh/m2a

Suzlon one earth campus is spread over 10.5 acres in Pune district of Maharashtra. It is designed as per sustainable building practices. The place was conceived with a business and functional need to bring all verticals and corporate services of Suzlon group under one roof. Suzlon energy limited, a world leading wind energy company, together with the architect, pledged to create a sustainable green environment for its professionals. The architect relied exclusively on no toxic and recyclable materials for construction.

A million square foot of ground plus two levels in a 10.4 acre urban setting in the campus achieve LEED platinum plus GRIHA five star rating, with 8% of its annual energy being generated on-site through photovoltaic panels and wind turbines with a total incremental cost of about 11%. 

Suzlon one earth derives its inspiration from some historical monuments in India such as Fatehpur Sikri Palace complex in Agra and Meenakshi Temple in Madurai. It is indeed the need of the hour that architecture should borrow elements like rationalism, with over hangs, louvers, pergolas, courtyards, water and natural light permeation.

Overall performance

The actual energy performance index (electricity) of the Suzlon one earth is 55.86 kWh/m2/year, based on the actual energy consumption of the building for the year 2011. Various measures undertaken to improve the overall performance of the building are:

  • Facades of the building face north, south, north west, south east, thus reducing the heat ingress in to the building and reducing the heating thermal load of the building.
  • Windows on the first and second floor are shared 100% using louvers.
  • Small terraces are created in each block to promote interaction with external climate.
  • 100% of the desks in the office areas are equipped with LED task lights.

Cost and effectiveness

The building shell costs around 7 per cent less compared to a conventional building. Special costs for green building specific services and components costs around 10 per cent more comparatively. However, overall costs for Suzlon building about 2.5 per cent more compared to a conventional building and can be recovered easily in two to three years.

Building basics

Year of completion 2009
Number of units None
Number of occupants None people
Elevation None m

Building areas

Special features

The building is LEED platinum rated as per LEED green building rating system and GRIHA 5 star rated building as per GRIHA green building rating system. The following special features are incorporated in the project:

  • There is a 65% reduction in the building water consumption with the use of low flow fixtures 
  • 55% of the water is reused and recycled within the campus.
  • There is a 50% reduction in the water use for landscaping through measures such as plantation of native species etc.
  • 100% shading on all first and second floors through external louvers.
  • Adequate daylighting and glare control methods are adopted.
  • 100% of the desks are installed with LED task lights.
  • There is 37% reduction in the quantity of structural concrete by using post tension slabs.

The external wall construction consists of 2 cm cement plaster, 20 cm fly ash brick and 2 cm plaster measuring a U-value of 2.040 W/m2K.

The ground floor construction consists of 15 cm RCC slab and 3 cm cement mortar measuring a U-value of 1.810 W/m2K.

The glass used in the window is double glazed glass with a U-value of 1.80 W/m2k and SHGC of 0.35.

Type of construction Middle


U-value window 1.80 W/m2K
Total area None m2
Glass infill
Solar heat gain coefficient None
U-value glass None W/m2K
U-value window frame None W/m2K

Passive strategies

The building has been designed for operation using natural ventilation and day lighting with proper orientation, thereby reducing the total thermal load on the building. All the buildings in the campus are designed such that they mutually shade adjacent buildings.

Additional information

Proper day lighting and glare control techniques have been adopted in the campus. All the buildings are provided with the provision of natural ventilation. To ensure minimum site disturbance, the campus is designed such that the open space exceeds the local zoning open space requirement by 25%, which helped conserve natural areas and restored damaged areas to promote suitable natural habitat and promote bio diversity on site.

There is no central heating or cooling system installed in the building. Different spaces in the campus are controlled by different cooling/heating system dedicated to respective buildings.

Indoor design temperature summer 26 °C
Indoor design temperature winter 23 °C

Heating system

There is no central heating system installed in the building.

Cooling system

The entire air conditioning load of the campus is met using water-cooled VRV units. Individual buildings are fed through individual Variable Refrigerant Volume (VRV) Out Door Units (ODUs). A total of 1,000TR (approximately 3,516 kW) capacity of VRV ODUs with a full load energy input ratio of 0.23 (COP 4.43) have been installed in the campus. The reception areas of all the blocks are not air conditioned but cooled through evaporative cooling.

Hot water system

A solar water heater system with a capacity of generating 10,000 litres of hot water has been installed in the campus.

Ventilation system

Each floor in each of the blocks has a dedicated fresh air handling unit, which directly supplies 100% fresh air in to the workspaces.

Power generation

13.44 kWp solar rooftop has been installed on the site along with small size wind turbines. However the wind turbines are not operational at present.

Detailed information on installed power generators not known.

Energy efficient lighting and appliances

All buildings in Suzlon campus have been designed to use day lighting extensively. The general lighting is designed to provide a lighting level of 300 LUX in all spaces. Energy efficient LED lighting has been installed in 100% workspaces.

Total energy demand of the building is met both by the electric power supplied to the building from the grid and through the captive power generated in the building. The total electricity consumed within the building as measured in the year 2011 is 5,621,853 kWh, out of which 5,296,800 kWh is from the grid supply, 197,754 kWh from diesel consumption and 127,299 kWh is generated from the rooftop photovoltaic system installed on the site.

Four numbers of 1010 kVA Diesel Generator (DG) sets are installed in the Suzlon one earth campus to generate the part of captive power within the campus. Approximately 6,700 litres of diesel annually is consumed to meet the power requirement of the campus. The average efficiency of DG set was found to be around 2.9kWh/L after the test performed on the installed system in 2010. The percentage loading, annually varies between 30-34%.

Primary energy consumption 5621853.00 kWh/year
Primary energy consumption (ref. building) 13254000.00 kWh/year
Specific primary energy consumption 79.33 kWh/m2/year
Specific primary energy consumption (ref. building) 419.36 kWh/m2/year
Differentiated specific primary energy demand and production

Accumulated specific primary energy demand and production

The below mentioned costs are comparative and are only for indicative purposes and do not reflect the actual costs incurred.

Yearly energy costs 646513 EUR/year

Investment cost

Absolute building investment costs

Specific building investment cost

Annual Costs

Absolute annual costs
Specific annual cost


Local Currency INR
Currency rate to EUR 0.01400 (March 3, 2017)

Energy prices

Electricity 0.1150 EUR/kWh

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