Green Plumbing

Answer: D - Each of the three options is a form of time-modified electricity pricing, and each option can encourage home occupants to shift their hot water usage patterns to take advantage of them. Time-of-use pricing divides each day into a couple of large time blocks that have different rates, often termed peak, semi-peak, and off-peak to reflect typical usage. Critical peak pricing signals customers when rates will jump significantly in the short term so they can reduce usage during that time and benefit from a slightly lower rate. Real-time pricing uses rates that shift many times per day based on the electricity generation cost at that time. It is moving into the residential sector despite the uncertainty of high rate unpredictability.