Conn. Gen. Stat. § 16-245a: Renewable portfolio standards.

(a) Subject to any modifications required by the Public Utilities Regulatory Authority for retiring renewable energy certificates on behalf of all electric ratepayers pursuant to subsection (h) of this section, sections 16a-3f to 16a-3j, inclusive, and sections 16a-3m, 16a-3n and 16a-3p, an electric supplier and an electric distribution company providing standard service or supplier of last resort service, pursuant to section 16-244c, shall demonstrate:

(1) On and after January 1, 2006, that not less than two per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(2) On and after January 1, 2007, not less than three and one-half per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(3) On and after January 1, 2008, not less than five per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(4) On and after January 1, 2009, not less than six per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(5) On and after January 1, 2010, not less than seven per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(6) On and after January 1, 2011, not less than eight per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(7) On and after January 1, 2012, not less than nine per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(8) On and after January 1, 2013, not less than ten per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(9) On and after January 1, 2014, not less than eleven per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(10) On and after January 1, 2015, not less than twelve and one-half per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(11) On and after January 1, 2016, not less than fourteen per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(12) On and after January 1, 2017, not less than fifteen and one-half per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional three per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(13) On and after January 1, 2018, not less than seventeen per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(14) On and after January 1, 2019, not less than nineteen and one-half per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(15) On and after January 1, 2020, not less than twenty-one per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class I or Class II renewable energy sources, except that for any electric supplier that has entered into or renewed a retail electric supply contract on or before May 24, 2018, on and after January 1, 2020, not less than twenty per cent of the total output or services of any such electric supplier shall be generated from Class I renewable energy sources;

(16) On and after January 1, 2021, not less than twenty-two and one-half per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(17) On and after January 1, 2022, not less than twenty-four per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class I or Class II renewable energy sources;

(18) On and after January 1, 2023, not less than twenty-six per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class II renewable energy sources;

(19) On and after January 1, 2024, not less than twenty-eight per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class II renewable energy sources;

(20) On and after January 1, 2025, not less than thirty per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class II renewable energy sources;

(21) On and after January 1, 2026, not less than twenty-five per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class II renewable energy sources;

(22) On and after January 1, 2027, not less than twenty-six per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class II renewable energy sources;

(23) On and after January 1, 2028, not less than twenty-seven per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class II renewable energy sources;

(24) On and after January 1, 2029, not less than twenty-eight per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class II renewable energy sources;

(25) On and after January 1, 2030, not less than twenty-nine per cent of the total output or services of any such supplier or distribution company shall be generated from Class I renewable energy sources and an additional four per cent of the total output or services shall be from Class II renewable energy sources.

(b) (1) An electric supplier or electric distribution company may satisfy the requirements of this section (A) by purchasing certificates issued by the New England Power Pool Generation Information System, provided the certificates are for (i) energy produced by a generating unit using Class I or Class II renewable energy sources and the generating unit is located in the jurisdiction of the regional independent system operator, or (ii) energy imported into the control area of the regional independent system operator pursuant to New England Power Pool Generation Information System Rule 2.7(c), as in effect on January 1, 2006; (B) for those renewable energy certificates under contract to serve end use customers in the state on or before October 1, 2006, by participating in a renewable energy trading program within said jurisdictions as approved by the Public Utilities Regulatory Authority; or (C) by purchasing eligible renewable electricity and associated attributes from residential customers who are net producers. (2) Not more than two and one-half per cent of the total output or services of an electric supplier or electric distribution company shall be generated from Class I renewable energy sources eligible as described in subparagraph (A)(x)(II) of subdivision (20) of subsection (a) of section 16-1.

(c) Any supplier who provides electric generation services solely from a Class II renewable energy source shall not be required to comply with the provisions of this section.

(d) An electric supplier or an electric distribution company shall base its demonstration of generation sources, as required under subsection (a) of this section on historical data, which may consist of data filed with the regional independent system operator.

(e) The authority shall adopt regulations, in accordance with the provisions of chapter 54, to implement the provisions of this section.

(f) Notwithstanding the provisions of this section and section 16-244c, for periods beginning on and after January 1, 2008, each electric distribution company may procure renewable energy certificates from Class I, Class II and Class III renewable energy sources through long-term contracting mechanisms. The electric distribution companies may enter into long-term contracts for not more than fifteen years to procure such renewable energy certificates. The electric distribution companies shall use any renewable energy certificates obtained pursuant to this section to meet their standard service and supplier of last resort renewable portfolio standard requirements.

(g) The authority, in consultation with the Commissioner of Energy and Environmental Protection and the Office of Consumer Counsel, shall initiate a proceeding to establish procedures for the disposition of renewable energy certificates purchased pursuant to section 16-244z, sections 16a-3f to 16a-3j, inclusive, and sections 16a-3m, 16a-3n and 16a-3p which may include procedures for selling renewable energy certificates or to retire such certificates on behalf of all ratepayers and reduce the percentage of the total output or services of an electric supplier or an electric distribution company generated from Class I renewable energy sources required pursuant to subsection (a) of this section. Any such reduction shall be based on the energy production that the authority forecasts will be procured. The authority shall determine any such reduction of an annual renewable portfolio standard not later than one year prior to the effective date of such annual renewable portfolio standard. An electric distribution company shall not be responsible for any administrative or other costs or expenses associated with any difference between the number of renewable energy certificates planned to be retired pursuant to the authority's reduction and the actual number of renewable energy certificates retired.