Mars Modules Edit
When it's time to terraform Mars, build a few Mars Solar Power Modules. These are the first tier of Mars 1x1 modules. Send them to Mars and 'land' them and watch them unfold as the Mars Solar Panel 1.
Research tech Mars1 to build electrolytic modules, water boreholes, gas harvesters, heat pumps and habitat modules. These solar panels may not be the best to use, but for people just starting out on Mars, they are the first option, and can be used if extra power is needed quickly.
Later on you can build 2x2 Deuterium Reactors for your power.