national grid 
noun British
1The network of high-voltage power lines between major power stations.Right now Lewis is connected to the national grid by a one-way powerline that enters the water at Ardmore bay on Skye....
- When Fawley power station is on-line it supplies 500 megawatts to the national grid - that's more or less enough power to keep Southampton alight.
- National Grid revealed today that the power line was now carrying electricity to supply the national grid.
2The metric system of geographical coordinates used in maps of the British Isles.
- good graces
- good grief!
- good guts
- good guy
- good hair
- good-handling
- good-hearted
- good-heartedness
- good Henry
- good-hitting
- Good Hope, Cape of
- good humour
- good-humoured
- good-humouredly
- goodiness
- gooding
- Gooding Day
- good-intentioned
- goodish
- goodish length
- goodish-looking
- goodishness
- goodish-sized
- good King Harry
- Good King Henry