The field in the centre of a solenoid is given by

B = μ

_{0}I N/L

ref

http://plasma.kulgun.net/sol_page/(independent of the area, I notice)

for N turns, length L and current I

μ

_{0} = 4π E^-7

This seems to suggest that a current of about 800A is needed to give you 1T of field.

The energy in an inductor is given by I

^{2}L/2

Using your 1H value for L, this looks like 0.32MJ.

The energy depends upon the field AND the area of the coils.

My arithmetic is always suspect so the numerical answer could always be wrong but the principle is ok.