With natural gas production continuing to gain momentum, the oil and gas industry is fueling major construction work in the region. The total cost of the top 25 projects that broke ground in the region in 2012 was $13.2 billion, a $1.1-billion increase over the previous year, according to ENR Texas & Louisiana's Top Starts list. Megaprojects in the oil and gas, petrochemical and energy sectors provided the big boost to this year's list. Analysts believe these projects are just the first swell of a huge wave of future work.