The short answer
To buy 100% renewable electricity in a deregulated state, filter the supplier list on your state portal for "100% renewable" or "Green-e certified" plans. Voluntary RECs add 0.3-0.6¢/kWh ($3-6/mo on a typical residential bill); Green-e certified adds 0.6-1.2¢/kWh ($6-11/mo). The renewable claim is verified via REC retirement on your behalf.
Buying 100% renewable electricity for a US household runs through one of three structures: voluntary RECs bundled into your supplier contract (cheapest, simplest), Green-e certified renewable supply (rigorous third-party verification, premium pricing), or direct power-purchase agreements (operationally complex, longest-term commitment). All three share the same physical reality: the electrons in your wires are still the grid average. The renewable claim comes from the REC (Renewable Energy Certificate) accounting layer.
The three tiers of US renewable supply
Voluntary RECs: any utility-licensed supplier in deregulated states sells voluntary REC products. Premium over standard supply: $0.30-$0.60/kWh — about $3-$6/mo on a residential bill.
Green-e certified: the most rigorous US third-party REC certification. Green-e RECs must come from generation built within the last 15 years and meet additional sustainability criteria. Premium: $0.60-$1.20/kWh — about $6-$11/mo on residential.
Direct PPAs: a contract directly with a specific renewable generator for a specific volume over 10-15 years. Best for: large commercial buyers. Not generally available for residential.
Why the REC layer exists
The grid is shared. When a wind farm produces 1 MWh, that energy enters the grid alongside coal, gas, nuclear, and other sources. There is no way to deliver "wind kWh" specifically to your meter.
The REC accounting layer solves this. The wind farm generates 1 MWh + 1 REC simultaneously. The supplier buys the REC and retires it on your behalf. The retirement is recorded in PJM-EIS GATS, ERCOT REC, NEPOOL GIS, etc.
Without RECs, "renewable supply" claims would be unverifiable. The REC system is what makes the renewable market real and auditable.
Infographic
Green premium by tier
How to buy 100% renewable supply for your home
Step 1: confirm you are in a deregulated state. Step 2: filter the supplier list for "100% renewable" or "Green-e certified" plans. Most state portals (PaPowerSwitch, Apples-to-Apples, Power-to-Choose) have this filter.
Step 3: read the contract disclosure. Confirm: what percentage is renewable; is it Green-e certified or voluntary RECs only; what is the term length; what is the early-termination fee.
Step 4: e-sign and switch. Same EDI 814 mechanic as any supplier change. Your bill displays the renewable claim on the supply line. The how-to-switch-energy-supplier guide walks the EDI mechanic.
Recap
Bottom line
Buying 100-percent-renewable electricity in the United States runs through Renewable Energy Certificates (RECs) — accounting instruments that represent the renewable attribute of 1 MWh of generation. The physical electrons in your wires are still grid mix; the renewable claim comes from RECs retired on your behalf. Voluntary RECs add 0.3 to 0.6 cents per kWh; Green-e certified products add 0.6 to 1.2 cents per kWh.
For most US households, the simplest path is filtering your state supplier portal for 100-percent-renewable plans and choosing a Green-e certified offer. The community-solar-vs-rooftop-solar guide covers physical solar alternatives; the net-metering-explained-state-rules guide covers the state-by-state rules for grid-connected solar.
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