The Government Communications Security Bureau operates what it describes as a satellite communications monitoring facility in the Waihopai Valley, which it calls GCSB Waihopai. It has been identified as being a part of ECHELON, the worldwide network of signals interception facilities run by the UKUSA consortium of intelligence agencies.
The lower Waihopai, as it runs into the Wairau Valley, has a number of vineyards, including one named Spy Valley. From 1925 to 1927 small hydroelectric power station was built in the valley. It is now operated by TrustPower.
- "IPENZ Engineering Heritage - Waihopai Dam". IPENZ. Retrieved 17 January 2013.