The people in Russia do have an abundant energy source. Russia is a world leader in the production of renewable energy, mainly through hydroelectric power sources.
Now Romania hasn't an abundant source of energy.
yes
nether
Yes; its name is oil (petroleum).
Romania has energy resources but not so abundant.
Solar.
Yes, they does (or do), if they choose to use it - the sun! They have a huge potential in the use of solar energy.
Solar.
The sun
Coal is the most abundant in the USA
Solar Energy