Yeash. The only 1000W fixtures used here were 1000W MV flood lights (GE P-1000s mostly, with some American Electric floods and maybe Westinghouse, though I usually only see them in 400W MV) and 1000W MV street lights (I've only seen M-1000s but I think the OV-50 might have been used). By the time the M-1000 was discontinued around 1986, they weren't installing 1000W MV street lights anymore and never installed any other lights over 400W.
GE has had capacitor issues on and off since the 70s. In the 70s and 80s their 400W MV lights had bad capacitors that frequently went bad (lamp would dim out as the cap lost farads) and since the early 2000s some 250W and 400W HPS GEs have had bad capacitors. The lamps run dim and are LPS in appearance. NGrid switched to Cooper for 250W and 400W street lights and flood lights but still uses GE for anything under 250W so I'm thinking they might have gotten tired of the bad capacitors (since under 250W lights don't use capacitors, thus nothing wrong with those fixtures).