Laser inertial fusion energy is a well-known safe,carbon-free,sustainable and clean energy source.A brief introduction to laser reference design in high power laser energy research (HiPER) project is presented.Then two schemes of multi kilojoule level laser chains concepts for HiPER program are emphasized on amplifier geometry,thermal,amplified spontaneous emission management,and beamline architecture,etc.Finally,the time schedule of the HiPER program for laser energy,namely the production of electricity using laser inertial fusion,is also introduced.