The City may issue bonds or notes for any improvement authorized by general or special law, including this chapter. The word "improvement," as used in this subchapter, shall have the meaning ascribed to it by the general laws of the State and shall include the acquisition and construction of facilities for the production and delivery of heat and of devices, facilities, and other measures to conserve energy or promote efficient energy use, and the acquisition or construction of any other work or improvement for which municipalities of the State may now or hereafter be authorized to incur debt. (Amended 2011, No. M-6, § 4, eff. May 6, 2011; 2013, No. M-19 (Adj. Sess.), § 2, eff. May 20, 2014.)