The Co-op has submitted an objection to Tesco's plans to build a new supermarket on Skipton Road, saying it would reduce takings at its Jennyfields store by 15%.
The Co-op on Jennyfield Drive is less than a mile from the old gasworks site where Tesco hopes to build its new supermarket.
It also operates smaller shops tied to petrol stations on Skipton Road and Ripon Road.
Planning consultant Barton Willmore submitted the objection last week on behalf of the retailer.
It was submitted two days before Waitrose submitted an objection of its own that claimed a new Tesco would have a "significant adverse impact" on its large supermarket on Station Parade as well as the large Asda on Bower Road.
Questions over retail assessment
The Co-op has criticised a retail assessment written on behalf of Tesco that was produced to support the retailer's claim that a new supermarket is needed in that area of Harrogate.
The assessment suggested a Tesco would only divert 4% of trade from the Co-op in Jennyfields, which the Co-op called "absurd" in its objection.
It said the true number would be closer to 15%.
Read more:
Tesco's retail assessment also said the Co-op was "locally-focused" and is "essentially a facility for the Jennyfield community".
It said any adverse impact from Tesco would be compensated for because residents at new housing developments around Skipton Road and Killinghall would use it.
The Co-op has disputed this suggestion and called on Tesco to produce new data that gives a "more accurate reflection" of the number of new homes that will be built in the area.
'Consider all feedback'
Tesco submitted plans to Harrogate Borough Council to build the new store in December.
It would be 38,795 square feet and include a petrol filling station, 200 car parking spaces, electric vehicle charging points and 24 cycle spaces. A new mini-roundabout would also be built on Skipton Road.
Tesco says 100 jobs would be created.
A Tesco spokesperson said it will consider all feedback from other supermarkets about the application.
They said:
0