SAGE was initiated by National Grid but was then adopted by the Department of Health in order to provide advice to Government on how to respond to the NRPB's 2004 recommendation to consider possible precautionary measures. It is funded equally by the electricity industry, Government, and the charity Children with Leukaemia. It is run on inclusive lines, with an emphasis on including all viewpoints, and a facilitator rather than a traditional Chairman.
First Interim Assessment
SAGE's First Interim Assessment was published in April 2007. It considers a number of generic issues, then possible precautionary measures for EMFs from three different sources: house wiring, appliances, and power lines and property.
On house wiring, it made a number of recommendations to remove features that sometimes produce high fields. On appliances, it recommended that manufacturers consider marketing low-field appliances. On power lines, it recommended more information for the public, and a technical measure called "optimal phasing". It presented as an option for consideration, but did not recommend, "corridors" where housing development would not be permitted close to power lines. It used a cost-benefit analysis to decide what should be recommended. More details on all of these.
When Government received the SAGE First Interim Assessment, they asked the HPA for a response to it. The HPA's response is available here and the Minister's reply is here.
The formal Government response to SAGE's First Interim Assessment was published in October 2009 as a Written Ministerial Statement. It adopted most of the recommendations on house wiring and on optimal phasing, but did not adopt the option for corridors, which was judged disproportionate. More details on the Government response.
Second Interim Assessment
After 2007 there was a lull in SAGE activity but it then restarted, looking principally at precautionary measures for EMFs from distribution systems. The Second Interim Assessment was published in June 2010. It makes many recommendations relating to distribution networks, many endorsing existing best practice. It also reports a Science Forum within SAGE. Full details here.
When Government received the SAGE Second Interim Assessment, they asked the HPA for a response to it. The HPA's response is available here.
The Government Response to the Second Interim Assessment was published in October 2011. It broadly supports most of SAGE's recommendations, but makes clear it is not appropriate for Government to legislate to make any of them happen; instead, it will work with industry and througfh standardisation bodies to see if voluntary agreements can be reached. See full details
SAGE covers only power-frequency EMFs (which it describes using the alternative definition "extremely low frequency" or ELF).