From what I read previously (experiences from others), I concluded that for interested customers with a solar installation Noreco doesn't really apply net-metering in its pure form. Instead I got the impression that Noreco pays only about half of what they charge you for any electricity that the customer delivers back to the grid. Proper net-metering would entail that the customer is only charged for their net consumption of electricity, in other words that the same rate would apply for both consumed and provided electricity. Under such a system (disregarding brownout risks) it would make more sense for the customer to put enough panels on the roof to cover full day use, but the case for batteries gets a lot less obvious. However, I assumed that local electricity cooperatives were operating within what the law allows/prescribes. Until today that is. This morning I came across a link to the RA 9513, the law "promoting development, utilization and commercialization renewable energy resources" and I was surprised to see the definition of net-metering under that Law (under section 4 gg) "net-metering refers to a system, appropriate for distributed generation, in which a distribution grid user has a two way connection to the grid and is only charged for his net electricity consumption and is credited for any overall contribution to the electricity grid." However, it would appear to be the case that despite the law's good intentions, net-metering isn't applied properly by the local electricity cooperatives, and they are supported by government agencies that make the rules for the law. Moreover, the application process is horrendously complicated, expensive and slow. So yeah, lawmakers intentions were good (to promote solar installations also for households), but it seems the bureaucracy has managed to effectively kill the initiative for many of those households.