Methods and tools can be used in the planning, development, operation, management and maintenance of systems for Energy saving and to plan Materials Use.
The Climate Group, provide three appendices for their SMART 2020: Enabling the low carbon economy in the information age (2008):
These technique can be used both for estimating the carbon footprint of ICT and how it may be used to reduce emissions in other sectors by using ICT.
The analysis measures emissions CO2e, assuming, the ICT sector covered:
The study excluded consumer electronics in the home: TVs, video, gaming, audio devices and media players. Specialised electronic devices, such as medical equipment was also excluded. Different assumptions would need to be made for organisations in specific industry sectors. As an example, a games software developer could not exclude computer games and a hospital not exclude medical devices.
The Climate Group carried out three phases of their study:
The Climate Group used published estimates of global emissions and penetration rates of ICT devices and infrastructure. Estimates of population growth were then used to calculate future emissions in 2020. Data was from public studies; academic and industry literature; the team experts, consumer surveys and interviews with external experts.
The analysis attempted a "cradle-to-grave" estimate of carbon emissions: manufacture, transport, use and disposal of equipment.
Embodied carbon: CO2e in manufacturing of ICT components was calculated from public and company data. Embodied energy in end-of-life treatment: disposal, landfill and recycling, was included where data was available.
Energy consumption of the components based on publicly available company data. An emissions factor was used to calculate the carbon emissions from energy consumption. The emissions from electricity generation vary depending on the technology used. The Climate Group divided the world into regions and used a different emissions factor for each region. Transmission losses in the electricity grid were similarly estimated.
Market growth and penetration of devices to 2020 was based on industry reports and internal analysis. Growth in use of ICT and general industrial growth is more significant in developing areas of the world.
The Climate Group used a cost curve to identify emissions abatement solutions ranked by cost. The study concentrated on areas where emissions are significant: power; manufacturing; industry; transport; residential and commercial buildings; forestry; agriculture; and waste disposal. ICT applications were then assessed for use in reducing in emissions abatement on the cost curve. Four uses for ICT were then selected for detailed analysis.
The Climate Group were undertaking a high level global analysis and therefore used some very general assumptions in their analysis. As an example: 20% of desktops are workstations, Workstations consume 2.5 times desktop in all modes, Commercial usage of a computer is 14 hours/day versus consumer usage of three hours/day, Three types of servers: 200, 500, 6000W/unit. These assumptions are listed in Appendix 3: "The Enabling Effect Assumptions" of the report (The Climate Group, 2008). An analysis for an organisation may use locally developed estimates or actual measures, but may also use these same assumptions, in order to enable a direct comparison.
The Climate Group made assumptions as to the effect ICT could have on other industry areas. As an example, it was assumed that on-line media would replace DVDs and CDs. This assumed seven billion DVDs and 10 billion CDs globally were sold per year, with 1 Kg CO2e per CD/DVD and all this would be replaced with network delivery of content by 2020. Similarly electronic documents were assumed to reduce paper use by 25%. Organisation based studies should be able to use better estimates or local measures of disk and paper use.
The Foundation for IT Sustainability (FFITS) provide instructions to Activate power management on Windows 7 (FFITS, 2011). The Consortium for School Networking provide an Energy Usage Calculator (CoSN, 2010).
FFITS provide instructions to configure power management for operating systems including Apple Mac, Microsoft Windows XP and Vista. They recommend setting computers to enter system standby or hibernate after 15 to 30 minutes of inactivity and set monitors to enter sleep mode after 5 to 20 minutes of inactivity. On laptops, these need to be activated in the AC power profile, as well as battery power) profile.
The CoSN Energy Usage Calculator (2010) prompts for the number of items of computer equipment, power use for each and the price of electricity, Hours in Workday and Days in Work week. Defaults are provided for the Active Power and Sleep Power (in watts) used by monitors and PCs. Estimates of the proportion of units power managed, Units Turned Off After Work are used and Tons CO2 are calculated.
It should be noted that the CoSN Energy Usage Calculator (2010) uses US defaults for the conversion factor for estimating carbon dioxide emissions from electricity used. The conversion factor varies from state to state in Australia and country to country around the world, depending on how electricity is generated. As Australia uses predominately coal fired power, an Australian calculator will give a higher estimate than a US calculator, where less coal is used.
The estimate of Energy Consumption and Carbon Footprint of ICT Usage in Australia (Philipson, 2010), divided ICT use into two categories: Households and Enterprises. The number of household users was derived from national statistics. The number and size of enterprises was obtained from national statistics, with industry categories used to estimate the likely intensity of ICT use.