The General Laws, as appearing in the 2018 Official Edition, are hereby amended by inserting after chapter 25C the following chapter:-

CHAPTER 25D. SOLAR NEIGHBORHOODS ACT.

Section 1. As used in this chapter the following words shall have the following meanings unless the context clearly requires otherwise:-

“Department”, department of energy resources.

“Developer”, any person or company that constructs residential or commercial buildings.

“Effective solar area”, the portion of a building roof on which the output from a solar energy system, taking into account shading from existing permanent natural or manmade barriers external to the building (including but not limited to trees, hills, and adjacent structures), would be equivalent to 70 percent or greater of the output of an unshaded solar energy system on an annual basis.

“Green roof,” a layer of vegetation planted over the roof of a building.

“Large commercial building”, a commercial building with 10,000 or more square feet of gross floor area.

“Multi-family dwelling”, a building intended to be inhabited as a primary or secondary residence by multiple individuals or groups of individuals living in separate apartments.

“New building”, any newly constructed residential or commercial building that requires a building permit to proceed.

“Single-family dwelling”, a building intended to be inhabited as a primary or secondary residence by one individual or group of individuals.

“Solar energy system”, any solar photovoltaic system that is installed on site and uses solar energy to provide all or a portion of the electrical needs of a residential or commercial building.

“Solar hot water heater”, any system that uses solar energy to heat water for use in a residential or commercial building.

“Substitute renewable energy system”, a renewable energy generating source, as defined in section 11F of chapter 25A, that is not a solar photovoltaic system, is installed on site, and provides all or a portion of the electrical needs of a residential or commercial building.

Section 2. (a) All new buildings shall be built to accommodate the installation of a solar energy system on their roofs. The department shall develop and adopt amendments to the state building code within 1 year from the passage of this act, in consultation with the board of building regulations and standards, to establish this requirement.

(b) In drafting the amendments to the building code, the department shall take into account existing building code requirements and compliance costs. The department shall also consult with scientists, engineers, and professional societies with relevant expertise in solar energy systems and building construction, and shall hold at least one public hearing.

(c) At a minimum, the amendments to the building code shall include requirements for: (1) static load roof strength, with a requirement that roofing where solar equipment could be placed be capable of supporting a minimum of 6 pounds per square foot; (2) placement of non-solar related rooftop equipment, taking into account positioning that avoids shading of solar equipment and maximization of continuous roof space; (3) sizing and provision of extra electrical panels to accommodate the addition of an appropriately sized future solar energy system; and (4) provision of space for a solar energy system DC-AC inverter in the utility room or on an outside wall.

(d) The department shall also consider including requirements for: (1) roof orientation and angle; (2) roof types that are compatible with a solar installation mounting strategy that will require minimal or no roof penetrations; and (3) a conduit for wiring from roof to electric panel.

(e) To the extent necessary, the amendments to the building code shall establish separate standards for residential and commercial buildlings and for different building types and occupancies.

Section 3. (a) Certain categories of new buildings, as specified in this section, shall be required to have a solar energy system. The department shall develop and adopt amendments to the state building code within 1 year from the passage of this act, in consultation with the board of building regulations and standards, to establish this requirement.

(b) Single-family dwellings shall have a solar energy system producing sufficient electricity on an annual basis to meet at least 80 percent of the estimated average annual electricity use of dwellings of a similar size.

(c) Multi-family dwellings and large commercial buildings up to ten stories in height shall have a solar energy system of a minimum generating capacity established by the department, which may be based on the size of the roof, building type and occupancy, estimated average annual electricity use of similar buildings, or other factors.

(d) The department may require other categories of new buildings to have a solar energy system, and set requirements for the minimum generating capacity of the solar energy system.

(e) The department may reduce the required minimum generating capacity of solar energy systems for single-family dwellings by up to 25 percent if installed in conjunction with a battery storage system with a minimum capacity of 7.5 kilowatt-hours per dwelling unit.

(f) The department shall estimate the average annual electricity use for the categories of buildings described in this section and revise its determination at least every three years, taking into account changes in electricity use due to energy efficiency improvements, electric vehicle charging, electric heating and cooling technologies, and other factors.

Section 4. (a) Developers may seek an exemption from the inspector of buildings or building commissioner from the requirements of sections 2 and 3 of this chapter upon a sufficient showing that the effective solar area is less than 80 contiguous square feet. Developers may seek a reduction in the required generating capacity of a solar energy system upon a sufficient showing that the effective solar area is 80 contiguous square feet or greater, but is insufficient to allow for the installation of a solar energy system meeting the minimum requirements established by the department.

(b) Developers may seek an exemption from the inspector of buildings or building commissioner from the requirements of sections 2 and 3 of this chapter upon a sufficient showing that a substitute renewable energy system will be installed at the time of construction, generating an equal or greater amount of electricity on an annual basis as the minimum required solar installation under section 3 of this chapter. Developers may seek a reduction in the required generating capacity of a solar energy system upon a sufficient showing that a substitute renewable energy system will be installed at the time of construction, generating sufficient electricity on an annual basis to offset the reduction in electricity produced by the solar energy system.

(c) Developers may seek an exemption from the inspector of buildings or building commissioner from the requirements under sections 2 and 3 of this chapter, or a reduction in the required generating capacity of a solar energy system, upon a sufficient showing that a solar hot water heater will be installed at the time of construction. Such exemption or reduction shall only be granted to the extent that the installation of a solar hot water heater reduces the portion of the effective solar area available for a solar energy system.

(d) The department may allow exemptions from the requirements of this chapter for affordable housing developments, after consulting with affordable housing developers and operators, community development corporations, organizations that represent affordable housing residents, and other stakeholders.

(e) The board of building regulations and standards shall promulgate regulations within 1 year of the passage of this act that clearly define the process for seeking an exemption.

(f) The provisions of the building code adopted under this chapter shall allow for the installation of a green roof in conjunction with a rooftop solar energy system.

Section 5. (a) All future editions and amended versions of the building code, as adopted by the board of building regulations and standards, shall include provisions meeting the requirements of sections 2, 3, and 4 of this chapter.

(b) The board of building regulations and standards, with the consent of the department, may from time to time revise the regulations promulgated under sections 2, 3, and 4 of this chapter, in accordance with changes in technology and building practices.

Section 6. Compliance with the provisions of this chapter shall not impair a building’s eligibility for any incentives, rebates, credits, or other programs to encourage development of renewable energy resources.

Section 7. A building permit for a new building shall not be granted without a showing that the building complies with the requirements of this chapter.

Section 8. Any person who fails to comply with or otherwise violates this chapter shall be liable for a civil administrative penalty not to exceed $10,000 for each violation, or twice the estimated additional cost that would have been incurred by constructing a building to meet the requirements of this chapter, whichever is greater.