No bonds shall be issued or sold under ORS § 470.220 to 470.290 nor indebtedness incurred thereunder, which singly, or in the aggregate with previous debts or liabilities incurred for small scale local energy projects, shall exceed any limitation provided in the Oregon Constitution at the date of the issuance and sale of such bonds. If the maximum aggregate principal sum of bonds authorized to be issued under ORS § 470.220 to 470.290 exceeds any limitation provided in the Oregon Constitution, bonds shall be issued under ORS § 470.220 to 470.290 in the aggregate principal sum of not to exceed that authorized under the limitation provided in the Oregon Constitution. [1979 c.672 § 25]