Through the lens metering was center weighted and automatic exposure was shutter speed priority. These are mechanical cameras without TTL metering or automatic exposure. Smart grid technologies emerged from earlier attempts at using electronic control, metering, and monitoring. Many other cities have no metering at all or meter only commercial customers. AES-128 bandwidth required for advanced metering infrastructure. China is planning for smart grid and related Advanced Metering Infrastructure. Consequently, carburetors are precise, but not accurate fuel metering devices. Current sustainability initiatives include lighting upgrades, building envelope improvements, metering upgrades, and landscape waste composting. The condensed refrigerant then passes through a pressure-lowering device also called a metering device. The first involves metering pressurised hydrogen into the gas network directly. PLC is one of the technologies being used in Advanced Metering Infrastructure (AMI) systems. Ideal for low power metering and medical applications. However, service quality was poor with intermittent supply, high water losses and no metering. Small- and medium-scale systems participated in a program modeled after net metering. The site is populated from information sent from the supplier regarding the metering system.