Renewable Portfolio Standards (RPS) are state-level policies that require utilities to source a certain percentage of their electricity from renewable sources — and solar has become a primary tool utilities use to meet these mandates. RPS policies vary widely by state, with some including solar-specific “carve-outs” that create additional demand and financial incentives for solar development.
What an RPS Requires
| Element | What It Means |
|---|---|
| Target percentage | Share of utility electricity that must come from renewables by a set year |
| Timeline | Often phased, increasing gradually toward a final target |
| Solar carve-out | Specific minimum requirement for solar generation within the broader RPS |
| Compliance mechanism | Utilities buy renewable energy or credits (RECs/SRECs) to meet targets |
Solar Carve-Outs
Some states include a solar-specific carve-out within their broader RPS, mandating a minimum share of renewable generation specifically from solar rather than any renewable source — this creates dedicated demand for solar development and often supports SREC (Solar Renewable Energy Certificate) markets.
How RPS Policies Drive Utility-Scale Solar
Utilities facing RPS compliance deadlines often sign long-term power purchase agreements with large solar farm developers, directly driving utility-scale solar construction — RPS policy has been a significant factor in the growth of large-scale solar capacity across the US.
State Variation
RPS requirements vary enormously by state — some states have ambitious targets (100% clean energy by a set date), others have modest voluntary goals, and some have no RPS at all. This variation significantly shapes how much utility-scale renewable development happens in a given state.
Impact on Homeowners
While RPS policy primarily affects utility-scale procurement, it can indirectly influence residential solar programs, net metering policy, and state-level solar incentives, since RPS goals often align with broader state clean energy policy goals that also support distributed solar adoption.
Want to add your own solar power at home? Get a free quote: (855) 427-0058
Frequently Asked Questions
What is a Renewable Portfolio Standard (RPS)?
A state policy requiring utilities to source a certain percentage of their electricity from renewable sources by a set date.
What is a solar carve-out within an RPS?
A specific minimum requirement for solar generation within a broader RPS, creating dedicated demand for solar.
Do all states have an RPS?
No — RPS policies vary widely, with some states having ambitious targets and others having none.
How does RPS policy drive utility-scale solar?
Utilities sign long-term power purchase agreements with solar developers to meet RPS compliance deadlines.
Does RPS policy affect homeowners directly?
Mainly indirectly, through influence on state clean energy policy, net metering, and solar incentive programs.
What is an SREC and how does it relate to RPS?
A Solar Renewable Energy Certificate, often used to help utilities comply with solar carve-out requirements.
Why do RPS targets vary so much by state?
Each state sets its own clean energy policy goals independently, resulting in significant variation nationwide.
Summing Up
RPS policies are a major driver of utility-scale solar growth across the US. To add your own solar power at home, call (855) 427-0058 or visit us.solarpanelsnetwork.com.
Updated