(o) To lease energy saving systems that replace non-renewable fuels with renewable energy such as solar powered systems; and
(p) To secure, with the approval of the department, in consultation with the executive office for administration and finance, indebtedness incurred for the preservation, modernization and maintenance of 1 or more of its low rent housing developments assisted under section 32 or 34 by a pledge of a portion of capital funds awarded to it for improvements to be carried out pursuant to a capital improvement plan, approved by the department and in accordance with department regulations governing capital projects. The department, in consultation with the executive office for administration and finance, shall promulgate regulations to establish limitations on the percentage of awarded capital funds that may be pledged to secure indebtedness, describe permitted terms for borrowing and repayment and establish criteria for operating agencies permitted to incur indebtedness secured by a pledge of capital funds. Any pledge of future year capital funds pursuant to this section shall be subject to the availability of funds under the department's capital spending plan. All financing documents related to future year capital fund amounts shall include a statement that the credit of the commonwealth is not pledged and that the pledging of funds shall be subject to the availability of funds under the department's capital spending plan.