152 SECTIONAL ADDRESSES 
carbonisation process. But neither is likely to provide low-grade coal. 
While only high-grade coal is used for actual hydrogenation, there is 
consumed a large quantity for heating purposes, and this may be of 
very low grade, if the works are near the pits, so at present there does 
not seem likelihood of the new industry providing power for the grid. 
The production of low-temperature carbonisation fuel provides a good 
gas as an additional product, which should be distributed as suggested 
above. While a fairly good coal with low sulphur and ash content is 
FIG. 1 
. £60 HYDRO-ELECTRIC 
. £40 ” 
+ £30 " ” 
. £20 a ” 
. STEAM STATION 
» PITS HEAD 
. £50 HYD. EL. & RESERVOIR 
Vans 
Py 
COST OF UNIT 
if 
me 
= 
= 
= 
& 
(aT 8 
EG eae 
LOAD FACTOR 
required for actual conversion, there is here also an additional amount used 
for heating, which can be low grade, and if the works are near to the 
pits, they will absorb all the refuse coal belonging to the coal that is 
coked. While this industry should have an important future, if properly 
organised, it does not seem likely to come into the electric supply scheme. 
The items in the cost of a unit have of recent years been codified 
and separated into parts dependent on the load factor and those that are 
independent, together with the influence of the size of the station. The 
costs for a normal station of 100,000 kw. and for a pit-head station of the 
same size are here given, assuming certain conditions. The capital 
