The company revealed this in a statement on Friday.
Spectra Energy Partners is Enbridde Inc’s U.S. partner.
Pipeline companies are reorganising their business structure after the U.S. Federal Energy Regulatory Commission in March stopped them from claiming an income tax allowance as part of the fees they charge shippers.
“Significant weakening of the US Master Limited Partnership capital markets has adversely affected the growth opportunities for MLPs, including Spectra,” Enbridge said in a statement reported by Reuters.
Enbridge raised its offer to 1.111 of its common shares for each Spectra unit, compared with its previous offer of 1.0123 of its shares.
Spectra Energy shares rose 5.7 percent to $40 in premarket trading, while those of Enbridge were marginally down.