TL;DR: Utah has one battery rebate worth talking about in 2026 — $2,000 from Rocky Mountain Power’s Wattsmart program on a Tesla Powerwall 3 install. It goes to the customer, not the installer, and BYOP files the application. (Tesla’s separate $500 Next Million rebate ended June 30, 2026.) The catch is that Wattsmart requires 4-year enrollment and grants RMP the ability to dispatch your battery during ~10 grid stress events per year (never below 20% reserve, never during a real outage). For most Tesla Powerwall buyers, the trade is worth it. Sigenergy and EG4 are not currently on the RMP eligible list.
What is Wattsmart, in plain English?
Wattsmart is Rocky Mountain Power's Virtual Power Plant (VPP) program. RMP pays Utah homeowners with batteries to let RMP draw from those batteries when the Utah grid is peaking — typically hot summer afternoons when everyone's AC is running and the grid hits its hardest stress hours.
The "why" is straightforward: Utah's grid hits its hardest stress hours about 10 times a year. Building new generation and transmission to handle those 10 hours is enormously expensive. Paying 5,000 homeowners $2,000 each for occasional access to their batteries is cheaper than building a peaker plant. That's the deal — RMP is buying the cheapest "generation capacity" they can get, and the homeowners are getting paid for letting them.
What the customer actually gives up
- Dispatch frequency: Roughly 10 events per year (RMP-published number from 2024–2025 program data)
- Dispatch duration: 2–4 hours per event
- Battery drain limit: RMP cannot drain below 20% reserve. You always have backup capacity left.
- Outage protection: If the grid is down (real outage), RMP cannot dispatch your battery. The battery is yours during emergencies, always.
- 4-year enrollment commitment. Early withdrawal forfeits some or all of the $2,000 plus the bill credits.
- Time-of-Day rate plan (Schedule 135/136/137). Cheaper imports at night, pricier at peak — usually a win for battery owners anyway.
- Notification: Your battery monitoring app shows you when a dispatch is happening.
What the customer gets
- $2,000 upfront paid by Rocky Mountain Power directly to the customer (a flat $2,000 per qualifying system, not per battery)
- Annual bill credits during enrollment
- Battery still yours during outages. RMP cannot reach a battery on an islanded grid — if the grid is down, the Powerwall is yours alone.
Eligible batteries (as of May 2026 RMP published list)
- Tesla Powerwall 3
- FranklinWH aPower 2 / aPower X
- SolarEdge Energy Bank
- Sonnen
- Fortress
- Torus
Not currently on the RMP list: Sigenergy, EG4, Anker SOLIX, Ecoflow.
For BYOP customers in practice, this means: Tesla Powerwall 3 is the only battery in our lineup we currently file Wattsmart on. That's a big reason it's our default retrofit recommendation when the customer doesn't have a specific reason to choose Sigenergy or EG4. Full brand comparison here.
How the Wattsmart application actually works
- We complete the install and commission the battery.
- We file the Wattsmart application with RMP on the customer's behalf (paperwork, system specs, interconnection details).
- RMP reviews and approves (typical 2–6 weeks).
- The $2,000 check arrives at the customer's address (not a bill credit — actual paper check or direct deposit).
- Battery is enrolled in dispatch for the next 4 years.
- Annual bill credits accrue automatically.
The customer doesn't have to chase any paperwork. We handle it.
Who shouldn't enroll in Wattsmart
- Anyone whose battery is critical to medical equipment. Wattsmart's 20% reserve floor is generous, but if you need certainty about full battery state for medical reasons, skip the program.
- Customers who can't commit to 4 years. Early withdrawal forfeits some or all of the $2,000 plus the bill credits.
- Customers with Sigenergy or EG4 batteries. Not currently eligible.
Bat estimates 80%+ of his battery customers enroll in Wattsmart. The trade is good for almost everyone.
"Will my battery wear out faster from Wattsmart dispatches?"
No. Modern LFP batteries (Tesla PW3, all our bench) are rated for 6,000+ cycles. Wattsmart dispatch ≈ 10 partial cycles per year ≈ 40 cycles over the 4-year enrollment = less than 1% of total cycle life. Not a meaningful concern.
"Will RMP drain my battery during an outage?"
No. The dispatch only triggers during grid peak demand, not during grid failure. During an outage, the battery is yours alone — RMP has no remote access to a battery on an islanded grid. This is built into the program design.
What's NOT in the stack (the federal ITC)
The federal residential solar/battery tax credit (the 30% ITC) expired December 31, 2025 per the One Big Beautiful Bill Act. It does not apply to 2026 residential battery installs in Utah or anywhere else. Full ITC breakdown here. What's left is what's described in this article: Wattsmart for Powerwall installs.
Frequently Asked Questions
How much is the Rocky Mountain Power Wattsmart battery rebate in 2026?
The current Wattsmart Battery program pays a flat $2,000 per system in Utah (as of May 2026) — one rebate per qualifying installation, not per battery. We confirm the current program terms with you before you sign.
How does Wattsmart actually work? Does RMP control my battery?
Wattsmart is a Virtual Power Plant program. RMP can dispatch your battery during grid peak demand events — typically hot summer afternoons. Roughly 10 dispatch events per year. Each event is 2–4 hours. RMP cannot drain your battery below 20% reserve, and cannot dispatch your battery during an actual grid outage. The program requires 4 years of enrollment and Time-of-Day rate plan.
Which batteries qualify for Wattsmart in Utah?
The May 2026 published RMP eligible-brand list includes Tesla Powerwall 3, FranklinWH aPower 2/X, SolarEdge Energy Bank, Sonnen, Fortress, and Torus. Sigenergy, EG4, Anker SOLIX, and Ecoflow are not on the published list. Of the brands BYOP installs, only Tesla Powerwall 3 currently qualifies for Wattsmart.
About the author
Batsaikhan(Bat) Ariun-Erdene is the owner of BYOP Electric and a Master Electrician. BYOP has filed Wattsmart applications on every qualifying battery install. More about Bat and BYOP Electric.