What is the relationship between 'Manitoba Hydro' and 'electricity' in the context of the input sentence.
Options: member of, distributed by, product/material produced, headquarters location

The business of hydro: Premier Greg Selinger and Manitoba Hydro interim president Darren Rainkie announced today that SaskPower will buy a minimum of 100 megawatts of electricity from Manitoba beginning in 2020.
product/material produced