There are several options in MA to going fully renewable with your electricity. It is a matter of cost. From lowest cost to highest cost, these are:
- The first option is rooftop solar with a reasonably sunny roof (like my house), about 5-8c/kWh, by far the cheapest option for 100% renewable electricity. Even roofs in half shade (like my garage) can produce electricity at 12c/kWh.
- Even with a no-cash-down solar lease (or power purchase agreement) the cost is around 13c/kWh. A huge discount to the Eversource or National Grid basic rate at 29c/kWh.
- Move to one of the towns (Wellesley, Littleton, Boxborough etc.) that have a Municipal Light and Power (MLP) source of electricity. Often around 18c/kWh and many offer 100% renewable options, usually for a slight premium.
- NexAmp offers a 12% discount to the Eversource basic rate (the R1 rate, now 29c/kWh, so the NexAmp price is around 26c/kWh) for 100% solar, 100% generated in MA. There is currently a waiting list. There are other suppliers than NexAmp but the others offer a 10% discount. This is accomplished via the z-metering provision of the net-metering law that allows the generator of renewable energy to sell the credits to other people with electricity meters. You end up getting two bills each month, one from Eversource (net of the credits from NexAmp) and one from NexAmp for the credits. The two net to a 12% discount to the ES basic rate.
- If you switch to heating with primarily heat pumps (you can still have a backup fossil fuel furnace) you can ask ES for the R4 rate which is for electric heating. R4 is about 1.5c below R1. This is regardless of whether you have solar or not. This does not cut your carbon emissions from the electricity you buy, but you are now not emitting carbon from burning a fossil fuel to heat your house. Effectively this is like buying electricity that is about 60% generated from renewable sources because your carbon emissions will drop about 60% due to the efficiency of a heat pump compared to a fossil-fuel furnace.
- Community choice aggregation offered through a town usually offers several options with a basic rate (ISO NE grid carbon emissions), a 50% renewable mix and a 100% renewable mix. The 100% renewable mix is usually more than basic rate but this is highly dependent of rates at the time the town bids out the contract.
- ES offers greener options through various generators for the supply portion of your current bill. I do not know current pricing but it used to be about 5-6c/kWh more expensive than basic rate for 100% solar, so say 35-36c/kWh
To read more about the “Fab Four” of heat pumps, insulation, triple-glazed windows and solar panels (which is how I got my house to a zero carbon footprint and also zero utility bills) please click here:
To watch a YouTube recording of my free “Zero Carbon, Zero Bills” webinar (it is 45 mins of me presenting then 45 mins of Q&A) please click here:
To watch a TED talk version that I gave at Harvard Business School, please click here:
To read written answers to over 300 questions that have been asked on my webinars, please click here:
To read more about David Green who is the author of the book “Zero Carbon Home” and the “Zero Carbon, Zero Bills” webinar, and who is both a bit of an energy geek (BS in physics from Oxford University) and a finance nerd (MBA from Harvard Business School), please click here: