We have to take the claim that FTTH is a greener technology for telcos in the proper context. It is greener for telcos because they install loads of active electronics on the subscriber's house, and thus offload the power burden of tomorrow's technology to today's unsuspecting consumer. That's the price we pay for progress.
Bottom line: FTTH is greener for telcos, not for you. But, depending on how much more often FTTH allows you to work from home, even that point could be debated.
Finally, there's also some debate as to whether VDSL2 does actually use less power than ADSL2. A presentation used by BroadLight Inc. at the most recent FTTH Conference noted that VDSL actually consumes more power, but the point of the comparison was to show that GPON was the best bet (for telcos) overall.
Broadlight's findings (and assumptions) are below:
Table 1: GPON's Green Tint
|GPON vs.||Power Savings||Power Cost Savings||CO2 Savings|
|ADSL2||~11 MWh||$1.2M||~4.8M lbs CO2 or 250K gallons of gas|
|VDSL||~29 MWh||$2.9M||~13.6M lbs CO2 or 700K gallons of gas|
� $0.10 kWh ( kWh = kiloWatt hour, MWh = MegaWatt hour)
Source: Broadlight, Inc.
— Phil Harvey, Editor, Light Reading