Net Metering: 104.774 out of 150 possible points
Solar Decathlon 2009 features a Net Metering contest. Each house is equipped with a utility meter that enables competition organizers to measure how much net energy the house produces or consumes over the course of the competition. Teams score points for producing as much or more energy than they consume.
The Net Metering contest comprises two parts:
- Energy Balance — Teams receive 100 points for producing at least as much energy as the house needs, thus achieving a net energy consumption of zero during contest week. This is accomplished by balancing production and consumption. At the end of competition week, when competition officials read the house electrical meter, it must be zero or less for the team to receive 100 points.
- Energy Surplus — Unlike consumers, who in most cases do not benefit from producing more energy than consumed, Solar Decathlon teams can receive up to 50 additional points for producing surplus energy over and above what they use during the contest week. When a team generates surplus energy, the house electrical meter turns backward past the net zero point to indicate a negative reading.