batteries will become more integrated once peak demand cost of set a charge and hold price from cheaper hours. With new gold nano tubules battery on the horizon with massive storange and deep cycling will changet things. The always on and available power is a not well thought out issue. What they really mean is power on tap when required so peak demand can be met. To make more $$$ on micro hydro you back log by minimizing flow during non peak hours and turn on full during peak using the stored water.