Utilize the input text as a context reference, choose the right relationship between Plug Power and fuel cell 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.

Plug Power or for that matter any other fuel cell stock has witnessed upside in its traded share price after clinching a big order.

Answer: product_or_material_produced