Hawaiʻi Home Energy Resilience Review
A smarter energy plan
before you sign.
Mainstay helps Hawaiʻi homeowners understand what the right solar, storage, and smart energy management system could really save — then stays involved through installation and beyond.
Guidance before the contract. Support through the install.
Hawaiʻi has the highest electricity rates in the country. That makes system design, storage strategy, and how much of your own solar you use especially important.
Based on your HECO bill and usage profile, we'll show you a personalized savings estimate after evaluating your roof and sun exposure — with the key assumptions clearly explained.
Start your savings estimateThe review
What we review for your home
Before any recommendation, we look at the whole picture — because one size does not fit all when it comes to your energy needs.
Your HECO bill
Review your historical daily consumption patterns and estimated future usage.
Roof & solar suitability
Orientation, shade, fit, and aesthetics.
Solar + battery fit
The right pairing for your home.
Backup & resilience
Which loads you want kept on during outages.
EV & smart loads
Charging and load-shifting opportunities to maximize savings.
Existing-system upgrades
Repowers and battery additions done right.
Tariff & incentives
Today's rules and how they apply to you.
Install & partner path
Coordination with qualified local partners.
The process
Guidance before the contract.
Support through the install.
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1
Assess
We review your bill, home, goals, and HECO's interconnection rules.
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2
Plan
We design the right system and show you a personalized savings estimate with the assumptions explained — before you sign anything.
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3
Coordinate
When you're ready, we bring in qualified and vetted local installation partners and manage the handoff.
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4
See it through
We stay involved through installation and power-on, so the finished system matches the plan.
From plan to power-on, we're with you.
Self-consumption
Use more of your own power, import less from the grid
The biggest savings often come from using more of your own solar during the day instead of exporting to the grid and receiving a low bill credit from HECO, then importing power back from the grid later at much higher cost. Smart controls of your air conditioning, EV charging, and right-sized battery storage can significantly increase your savings.
We model the potential impact for your home, then explain the assumptions — and once your system is running, we can help you see the real results.
Shifting evening use to stored daytime solar is where much of the value lives — we model it for your home.
A real Oʻahu system
What a thoughtfully built system looks like
This is founder Ryan Park's own Oʻahu home — an older full-NEM 4.5 kW rooftop array expanded with 10 kW of new panels, 20 kWh of battery storage, and a smart EV charger, brought together into one modern system with app-based monitoring.
One system, working together
An older array kept in service, new capacity and storage added, and the whole system tied together with modern monitoring — the kind of upgrade path we help homeowners plan without losing what already works.
A real Oʻahu installation. Every home's system is designed around its own roof, usage, and goals.
Already have solar, but no backup power? We have options to make it happen.
If your system is several years old, you may be able to add battery storage or capacity — but the details matter, especially if you're on an older net-metering agreement. We help you weigh upgrades without jeopardizing grandfathered tariff terms where they apply, so you keep what's working and improve what isn't.
Review my existing system
Ryan Park
Founder, Mainstay Energy Advisors
Who shapes your plan
Led by an Oʻahu energy expert who's seen every side of it
Mainstay Energy Advisors is led by Ryan Park, a Hawaiʻi clean-energy professional with over 25 years of experience across the USA in residential, commercial, and utility-scale solar and storage. Ryan has seen multiple generations of industry change — from rooftop sales models to grid-scale projects, storage economics, and utility tariffs — along with the realities of Hawaiʻi's energy economics and what it takes to get a system built right. That whole-picture experience is what shapes your plan.
No obligation
See your personalized savings estimate
Tell us a little about your home. We'll follow up to start your Hawaiʻi Home Energy Resilience Review — no obligation.
Savings figures are personalized estimates, not guarantees. Your actual results depend on your home, usage, equipment, installation, weather, utility rates and tariffs, incentive eligibility, and financing. We'll explain the key assumptions behind your estimate before you commit.