Based on ongoing research, I would like to find out if there are any sources or publications already available on the costs of terrorism/critical incidents on critical infrastructure (oil, gas, energy, power, water) in the MENA region. If so, please get back to me.
You have brought in very pertinent question. While the simple answer would be the economic cost of inaction to end terrorism, it requires understanding the complex question of what are the foregone benefits from not being able to harness the critical energy infrastructure for energy security that plays at crossroad of economic security, environmental security and national security to address the daunting challenge facing the mena region.
If you search Israeli media you could find that threats on the country's evolving sea-based gas infrastructure (e.g. by Hezbollah and other armed groups) resulted in heavy investments. These include upgrading of the Israeli Navy's platforms as well as R&D. These measures actually distorted the defence budget.
The terrorism has multi-facet impacts on the entire economy in an interrelated manner and as such the real cost is more than the estimated energy cost. In this sense, understanding the overall cost is perhaps important first step and for this illustration, Somalia cost of terrorism could be a case in point. According to a study in 2011, the international Community has collectively spent just over $55 billion in responding to Somalia’s conflict since 1991. Piracy (ransom, rescue) accounts for the largest chunk of this cost ( 40%) , followed by humanitarian and development aid ( 23%) ; remittances (20%) and the rest 17% is accounted for by peacekeeping and military responses , counter-terror initiatives and diplomacy; and costs associated with international crime and illicit financial flows.
See Norris, J., and B. Bruton. 2011. ‘Twenty Years of Collapse and Counting: The Cost of Failure in Somalia’. A Joint Report from the Center for American Progress and One Earth Future Foundation.