available tidal energy is relatively low, on the order of handful kWh per day per UK citizen. extracting all available tidal energy would require extraordinary

available tidal energy is relatively low, on the order of handful kWh per day per UK citizen. extracting all available tidal energy would require extraordinary investment. in effect, it's unrealistic to expect more than 1-2 kWh per day per person. solar and wind are much better bets, though neither is on par with coal. I recommend reading this book: www.withouthotair.com/ it contains nice estimates of energy used by UK people on the one hand, and energy available from various sustainable sources.