Charting out the Generation, Revenue, Expense of our PV System

I've cumulatively plotted out the revenue my PV system has generated over time as well as what I've paid on our load. I've also plotted out the microFIT payments I've received from Guelph Hydro. Note the following:

• revenue (blue) increases relatively over the spring and summer months and slows down over the winter
• our revenue was initaially greater than out payments, then over the first winter revenue was lower than the payments. The revenue overtook the loan payments in June 2011 and has been a net income ever since
• our net earnings to date have been approximately $8500-$7500=$1000
• the microFIT payments are lagging my loan payments - I've needed to keep a float in my account to cover the delay of payments
• the time period between microFIT payments from Guelph Hydro is rather variable. The last payment in particular was delayed quite a bit and I had to put extra money in my account to cover the automatic withdrawal of the loan payments. Guelph Hydro told me they are implementing a new billing and payment system that will automate their payments. They told me they had now over 100 microFIT contracts connected in Guelph. It also tells me that Guelph Hydro is much more consistent in sending bills to me than wanting to pay me.

Revenue generated, loan expenses, and microFIT payments