Align Capital adds Emission Monitoring Services of Texas to stack testing portfolio company Align Capital adds Emission Monitoring Services of Texas to stack testing portfolio company Print Align Capital Partners has announced the acquisition of Emission Monitoring Services Inc. (EMSI), a Houston-based provider of leak detection and repair services in the stack-testing field, as the latest add-on for a platform now known collectively as Alliance Technical Group. Financial terms of the deal were not disclosed. Alliance Technical Group is the latest iteration of what previously was known as Alliance Holdings, an Alabama-based platform providing emissions (i.e. stack) testing for companies primarily in the western United States.