Utilize the input text as a context reference, choose the right relationship between Interxion and data center from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

In early June, Interxion announced that it reduced its cooling system energy consumption by 20%, during the first year of an ongoing project with EkkoSense a data center optimization specialists.

Answer: industry