We're often told though that only coal and nuclear plants can keep the lights on, because they're 24/7, whereas wind and solar power are variable, and hence supposedly unreliable.
常常有人对我们说 只有燃煤和核能才能稳定供电 因为它们是全天候的 而风能和太阳能变幻多端 所以有人认为它们不可靠