Prepared by the Design of Steel Transmission Towers Standards Committee of the Codes and Standards Activities Division of the Structural Engineering Institute of ASCE This standard provides requirements for the design, fabrication, and testing of members and connections for latticed steel electrical transmission structures. Covering guyed and self-supporting structures, these requirements are applicable to hot-rolled and cold-formed steel shapes. The standard specifies the design criteria for structure components--members, connections, and guys--to resist design-factored loads at stresses approaching yielding, buckling, or fracture. This new edition, which replaces the previous Standard ASCE 10-97, presents minor changes to the design requirements and introduces new sections on redundant members, welded angles, anchor bolts with base plates on leveling nuts, and post angle member splices. Topics include: loading, geometry, and analysis; design of members, including compression members, tension members, and beams; design of connections, including fasteners, minimum distances, and attachment holes; detailing and fabrication; full-scale structure testing; structural members and connections used in foundations; and quality assurance and quality control. A detailed commentary contains explanatory and supplementary information to assist users of the standard. In addition, one appendix offers 17 design examples, and a new appendix offers guidance for evaluating older (legacy) electrical transmission towers. Standard ASCE/SEI 10-15 is a primary reference for structural engineers designing latticed steel electrical transmission structures, as well as for other engineers, inspectors, and utility officials involved in the electric power transmission industry.

India is a leading developing country in providing electricity to rural and urban populations. By late 2012, the national electricity grid had reached 92 percent of India's rural villages, or about 880 million people. Yet, approximately 311 million people-mostly those in rural areas-still live without electricity. Less than half of all households in the poorest income group have electricity. Even among households with electricity, hundreds of millions lack reliable supply and experience power cuts almost daily. Achieving universal access to electricity by 2030 is not fi nancially prohibitive for India. The challenge of providing electricity for all is achievable, ensuring that India joins such countries as China and Brazil in reaching out to even its remotest populations. Policies will need to be aligned with the principles followed in other successful international programs. The potential benefi ts of electrifi cation for those without service are quite high. The benefi ts of lighting alone would approximately equal the investments necessary to extend electricity for all. Households with electricity consume more than 100 times as much light as do households with kerosene for about the same amount of money. Without quality energy services, households often face entrenched poverty, poor delivery of social services, and limited opportunities for women and girls. This book will be of interest to a wide audience, including policy makers, experts and managers in the international development community, and those in academia.

The electric power delivery system that carries electricity from large central generators to customers could be severely damaged by a small number of well-informed attackers. The system is inherently vulnerable because transmission lines may span hundreds of miles, and many key facilities are unguarded. This vulnerability is exacerbated by the fact that the power grid, most of which was originally designed to meet the needs of individual vertically integrated utilities, is being used to move power between regions to support the needs of competitive markets for power generation. Primarily because of ambiguities introduced as a result of recent restricting the of the industry and cost pressures from consumers and regulators, investment to strengthen and upgrade the grid has lagged, with the result that many parts of the bulk high-voltage system are heavily stressed. Electric systems are not designed to withstand or quickly recover from damage inflicted simultaneously on multiple components. Such an attack could be carried out by knowledgeable attackers with little risk of detection or interdiction. Further well-planned and coordinated attacks by terrorists could leave the electric power system in a large region of the country at least partially disabled for a very long time. Although there are many examples of terrorist and military attacks on power systems elsewhere in the world, at the time of this study international terrorists have shown limited interest in attacking the U.S. power grid. However, that should not be a basis for complacency. Because all parts of the economy, as well as human health and welfare, depend on electricity, the results could be devastating. Terrorism and the Electric Power Delivery System focuses on measures that could make the power delivery system less vulnerable to attacks, restore power faster after an attack, and make critical services less vulnerable while the delivery of conventional electric power has been disrupted.