There has been a lot of talk about improving the nation's aging power infrastructure, some stemming from President Barack Obama's plan to provide incentives for energy upgrades and "smart-grid" technology to boost the economy. So, what's a smart grid and what does it mean for you? A smart grid would turn our energy system into an interactive network connecting power stations, meters and home appliances. Utility companies would be able to collect real-time information about demand and supply to avoid blackouts, repair problems and get consumers to conserve. Companies are already on board. Electricity providers have been installing meters they can read remotely. Exelon ( EXC) uses them to spot outages before angry customers start calling. Whirlpool ( WHR) is developing appliances that can exchange information with power companies. Utilities could use that data in a Web site that would show consumers the devices using the most juice in their homes. Companies ranging from Google ( GOOG) to little-known Comverge ( COMV) are developing tools to help consumers track their power usage. The idea is that if we know how much it costs to run energy-guzzling appliances, we'll use air conditioners less and wash clothes in cold water. Demand is expected to grow twice as fast as capacity in the coming years, according to the North American Electric Reliability Corp. Our consumption already outpaces that of other western nations on a per capita basis. Studies show that being able to track power usage typically leads consumers to cut back by 5% to 15%. Consolidation Edison's ( ED) handling of New York's outages last summer reveals the "dumb" state of our grid. The utility provided an online map that showed the locations of outages and repairs. But the clumsy map was updated every half-hour based on phone calls from customers and Con Ed workers.