1.   An efficient boiler will conserve energy and save you money.

2.   He was planning later in the week to make three major speeches, and he would need to conserve his energy.

3.   I stayed instead in a dark, sealed room, conserving energy for the next onslaught.

4.   It gives stamina and firmness of purpose by conserving vital energy.

5.   Sleep is also a time when some animals purposely conserve energy because it would be wasteful not to do so.

6.   The best rule is to conserve energy and to increase funding for research into renewable energy sources.

7.   The lions spend much of the day sleeping, conserving energy for the hunt.

8.   They became cranky and quarrelsome, and stopped most of their activities in order to conserve energy.

9.   Try and rest frequently to conserve your energy.

10.   The building is expressly designed to conserve energy.