VIJAYAWADA: The Andhra Pradesh government has taken initiative to facilitate quality energy-efficient appliances at highly cost-effective prices to 15.60 lakh houses under the phase -1 of India’s biggest housing scheme — Navaratnalu Pedalandariki Illu (NPI), which are expected to save 734 units of energy per house per annum, which amounts to Rs 350 crore for 15.6 lakh houses, besides helping improve the quality of life of beneficiaries.