Generation and distribution are large capital expenditures while the engineering, fuel and maintenance all add up.

FORBES: Boulder Battles for Control of Xcel Energy's Assets

It said the underpass option would be more expensive and would result in "significant engineering problems... and regular maintenance".

BBC: Ely bypass: Campaigners brand scheme 'devastating'

It is not possible to meet development and integration needs without building a strong engineering base for the design, construction and maintenance of infrastructure facilities.

FORBES: Africa's Leadership Fails Billionaire Mo Ibrahim's Test, But Technocrats Rise

Group CEO Alan Joyce revealed the airline was reviewing its maintenance facilities in Australia and consolidating its catering and engineering operations.

CNN: Qantas predicts huge profit slump

The company has built a business model that is hard to replicate, partly because it does engineering, sales, installation and maintenance in-house.

FORBES: SolarCity Posts Higher Q1 Sales And Installations

It provides specialist services in rail design, engineering, construction, management and maintenance, and offers supply chain solutions to a range of customers in Australia.

FORBES: Aurizon Holdings

So it is not surprising that the stock of Fluor Corp. ( FLR, 47) , which provides engineering, procurement, construction, maintenance and project-management services for refineries and power plants, is down 48% in the last 12 months.

FORBES