(b) The commission shall also consider adopting, by rule, a requirement that all sellers of electricity to retail customers in the state, including rural electric cooperatives, municipally owned electric facilities or utilities serving less than thirty thousand residential electric customers in this state, offer net metering rebates or discounts to customer-generators.
(c) The commission shall institute a general investigation for the purpose of adopting rules pertaining to net metering and the interconnection of eligible electric generating facilities intended to operate in parallel with an electric utility's system. As part of its investigation, the commission shall take into consideration rules of other states within the applicable region of the regional transmission organization, as that term is defined in 18 C.F.R. §35.34, that manages a utility's transmission system in any part of this state. Furthermore, the commission shall consider increasing the allowed kilowatt capacity for commercial customer-generators to an amount not to exceed five hundred kilowatts and for industrial customer-generators to an amount not to exceed two megawatts. The commission shall further consider interconnection standards for combined heat and power.
(d) The commission shall promulgate these rules within twelve months of the effective date of this article.