Electricity companies pay a premium for renewable energy.是什么意思？

Electricity companies pay a premium for renewable energy.

电力公司为可再生能源支付额外的费用。

electricity

n. 电力，电流，静电，高涨的情绪，紧张；

例句
There was an electricity black-out in a large area in the north of the country.
该国北部大片地区断电。

companies

n. 公司( company的名词复数 )，[军事]连，连队，客人；

例句
The workforce have recently been calling for their working hours to be reduced. Many companies have accordingly switched to a five-day week.
工人们最近一直在呼吁缩短工作时间。许多公司于是转成了一周五天工作制。

pay

vt.& vi. 付款，偿还，补偿，（对…）有利；vt. 给予，支付；n. 工资，薪水，报答；adj. 收费的，需付费的；

例句
Single people are treated as an aberration and made to pay a supplement.
独身者被当成异类，而且要付一笔额外的费用。

premium

n. 额外费用，保险费，附加费；adj. 高昂的，优质的；

例句
Sales are growing for premium wines, but at a bare 2 percent a year.
高档酒的销量正在增长，但年增长率只有2％。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

renewable

adj. 可继续的，可续订的，可更新的，可再生的，可翻新的；

例句
A formal contract is signed which is renewable annually.
正式签订了每年可续签的合同。

energy

n. [物]能量，活力，精力，精神；

例句
A household radiator absorbs energy in the form of electric current and releases it in the form of heat.
家用取暖器吸收电流能量，再以热量的形式释放出来。