These are the most frequently used words in this book.
able
amount
atoms
automobile
available
battery
between
biomass
building
called
car
cell
century
come
conservation
cost
countries
current
development
devices
does
earth
efficiency
electrical
electricity
electrons
energy
engine
enough
even
facility
fig
first
fossil
fuel
fusion
gas
gasoline
generated
government
great
heat
high
hot
hour
hydrogen
increase
industry
installation
kilowatt
land
large
less
material
might
must
need
new
now
otec
per
percent
photovoltaic
place
plants
possible
potential
power
price
problem
produce
project
provide
renewable
requires
research
seems
should
silicon
small
solar
source
states
still
sun
supply
system
technology
temperature
time
turbine
two
united
use
used
vehicles
water
wind
world
years