(viii) to enter into energy services contracts in accordance with section 11C of chapter 25A for a period of up to 20 years.
(f) Projects pursuant to this section may include a mix of extremely low income households, low or moderate income households and market-rate housing and may utilize any available source of rental subsidy or financial assistance; provided, however, that operating subsidies appropriated by the general court and bond funds authorized by the general court for the benefit of low rent housing projects operated pursuant to sections 32 and 40 shall not be used to fund capital or operating costs other than those for the redevelopment, repair and operation, including services benefitting the tenants, of such housing.
(g) Notwithstanding subsection (d), the local housing authority shall:
(i) comply with section 12, related to wages, labor requirements and the Social Security Act;
(ii) comply with section 29, related to wage rates and collective bargaining;