Durham 182 for 4 beat Yorkshire 176 for 9 (Jennings 4-37) by six runs
Durham christened their new floodlights with an exciting six-run win over previously unbeaten Yorkshire in the NatWest T20 Blast.
The hosts made 182 for 4 batting first with four of their top six scoring in the 30s, and then limited Yorkshire to 176 for 8 in reply as Keaton Jennings starred with the ball.
Jennings finished with figures of 4 for 37 with his occasional medium pace, including the key scalps of Jonny Bairstow and Glenn Maxwell.
The victory leaves Durham at the top of the North Group with three wins from four matches, two points ahead of second-placed Yorkshire.
The attendance was 5,539 for the first match played under the new permanent floodlights at Chester-le-Street, with hopes of attracting the ground's record crowd for a county match not helped by the weather and the Headingley Test.
Rain delayed the 7pm start by 25 minutes, after which the sun shone throughout Durham's innings after they were put in.
Mark Stoneman and Phil Mustard got the hosts off to a flying start with a stand of 30 in 3.2 overs, and Paul Collingwood, Gordon Muchall and John Hastings made sure that was not wasted.
Hastings provided the late momentum as he hit Tim Bresnan's last four balls for three fours and a six as 21 came off the over.
In a quirk of fate, Yorkshire also needed 21 runs off their final - bowled by Hastings - to snatch the victory.
Bresnan had his chance of revenge with 12 needed off the last two to tie, but he missed the first before hitting the last high over the mid-wicket boundary. It left him unbeaten on 36, but scarcely atoned for his figures of none for 51 with the ball. While it was left to Hastings to finish things off, it was Jennings who did the damage earlier on.
Jennings is Durham's four-day opening batsman and had bowled only one over in the three previous T20 matches. But with skilful variations of pace he persuaded Bairstow and Maxwell to play across the line of straight balls, while he also sent back Jack Leaning and Rich Pyrah as Durham claimed the points.