Ferguson's plan would cap the amount other power customers could pay for Century's power bill at $60 million over the first three years of the rate plan while still giving Century some discounts.
Harris then offered a third proposal, dubbed the "do no additional harm" plan. It essentially eliminates the third part of Century's plan.
While Century's power rate would be allowed to fluctuate as aluminum prices rose and fell, the proposal includes a minimum rate that would prevent other ratepayers from being forced to pick up some of Century's costs.
The minimum rate, $36.97 per megawatt hour, would kick in when aluminum traded at or below $2,124 per ton — roughly $30 above what it traded at Monday.
The PSC asked the Consumer Advocate's Division on Monday to clarify if this minimum rate included the $20 million in tax credits approved by the Legislature.
Harris said Monday afternoon it did not.
He said the $36.97 rate is what would need to be paid to Appalachian Power to ensure other customers didn't have to pay more. He said it could be paid either by Century or through the use of the credits.
"The rate could be lowered by the tax credit," Harris said.
The plan would still involve having other ratepayers continuing to pay the $17.3 million a year in costs they already are paying. Harris said allowing that alone would be an unprecedented action.
The Consumer Advocate Division must file a formal response with the PSC by 5 p.m. today. Officials still believe the commission could make a final decision in the case by the end of this week.
Harris said he knows the commission has been heavily deliberating all three plans in the case. He expects whatever proposal the commission chooses to be complex.
"They're taking this very seriously — they want to make sure they've got their I's dotted and T's crossed," he said. "I'm sure it's going to be a complicated proposal, no matter what."
Contact writer Jared Hunt at jared.h...@dailymail.com or 304-348-5148.