Lately, in some countries and regions, the installed capacity of alternative (wind and solar) generation has already reached a significant share of the total capacity of the grid. However, contrary to expectations, there is not a single country or territory in the world, in which high level of implementation (10-40% of installed capacity) of supposedly “free” alternative energy would be accompanied by a decrease in the price of electricity for consumers. On the contrary, in such countries the tariff increases three to four times or more, and the probability of network blackouts increases by an order of magnitude, with huge losses in continuous technological processes. There is already noticeable slowdown in the introduction of new alternative energy power plants. This paper analyzes the causes of this phenomenon. The method of analysis is the review and comparison of publications of leading foreign experts in the field of energy generation. The main problem turns out to be not in reducing the cost of solar panels and wind generators, but in the destabilizing effect of alternative generation on the existing power grid. The main disadvantage of alternative generation is its uncontrollable discontinuity.