This paper explores optimal treatment of an SIS (Susceptible-Infected-Susceptible) disease that has two strains with di¤erent infectivities. When we assume that neither eradication nor full infection are possible, it is shown that there are two categories of equilibria. First, there are two...

Electricity distribution networks are capital intensive systems and timely investments are crucial for long-term reliability of their service. In coming years, in the UK, and elsewhere in Europe, many networks are in need of extensive investments in their aging assets. Also, aspects of energy...

Interstate gas pipelines and their customers presently settle about 90% of the rate cases set for hearing before the Federal Energy Regulatory Commission (FERC). In recent years, the median time for negotiating settlements and having them approved is about 11 months, compared to several years to...

Benchmarking of electricity networks has a key role in sharing the benefits of efficiency improvements with consumers and ensuring regulated companies earn a fair return on their investments. This paper analyses the theory and practice of international benchmarking of electricity transmission by...

On 29 June 2011 the Australian Competition and Consumer Commission (ACCC) accepted an access undertaking from Australian Rail Track Corporation (ARTC) in relation to the Hunter Valley rail network. The ACCC encouraged ARTC and its users (principally coal producers) to discuss and negotiate the...

The electricity systems have a central role to play in the transition towards a low carbon economy and integration of renewable energy sources in the European Union. However, the European electricity networks face a diverse set of existing and new risks that can hamper the energy security of...

The paper explores the monitoring by 'external Names' (the principals) of 'working Names' (their agents) in the Lloyd's insurance market of the 1970s and early 1980s. The market was relying heavily on external Names to finance its rapid growth; and these principals were dependent upon their...

In the UK, domestic customers must be able to terminate energy contracts at 28 days’ notice. This has been seen as a transitional protection for customers and for competition. This paper reviews the arguments for and against the 28 day rule, and examines the extent to which UK suppliers have...