What it is
The energy transition is the shift from fossil-fuel-based electricity generation (coal, oil, gas) to renewables — mainly solar, wind, hydro, and geothermal, alongside nuclear as a low-carbon (though not renewable) baseload source. This topic covers both the physical grid that transition runs on and the software built to modernize it.
The grid, in three parts
The grid, at a basic level, has three parts: generation (power plants), transmission (high-voltage lines moving electricity long distances), and distribution (local lines delivering it to homes and businesses). Electricity generally can’t be stored cheaply at grid scale without batteries (see the Storage topic), so supply and demand have to be balanced in real time, a process called grid balancing or dispatch.
Generation economics
- Baseload vs. intermittent (or variable) generation — baseload sources (traditionally coal, gas, nuclear) run continuously; intermittent sources (solar, wind) only generate when conditions allow. This is the core technical challenge of decarbonizing the grid: replacing always-on generation with weather-dependent generation.
- Capacity factor — the share of a power plant’s theoretical maximum output it actually produces over time. A gas plant might run at a 55% capacity factor; a solar farm might run at 25%, meaning the solar farm needs roughly four times the nameplate capacity to deliver the same total energy over a year.
- Levelized cost of energy (LCOE) — the average cost per unit of electricity a plant produces over its full lifetime, the standard metric for comparing the economics of different generation types. In practice, utility-scale solar now often has a lower LCOE than a new gas plant, which is the main reason solar keeps getting built even without subsidies, not just climate pressure.
Getting power onto the grid
- Grid interconnection — the process of physically and administratively connecting a new power plant to the grid. The interconnection queue (often a multi-year regulatory backlog) is one of the biggest practical bottlenecks slowing renewable buildout today, more so than the cost of the technology itself.
- Distributed energy resources (DERs) — small-scale generation or storage located where electricity is used rather than at a centralized plant: rooftop solar, home batteries, EV chargers.
- Virtual power plant (VPP) — software that aggregates many small DERs (home batteries, smart thermostats, EV chargers) and coordinates them to act collectively like a single power plant, providing grid services without building new centralized generation. A significant and growing Climate SaaS-adjacent category.
- Demand response — programs that pay or incentivize consumers, often large industrial ones, to reduce electricity use during peak demand rather than building more generation capacity to meet it.
Markets and contracts
- ISO/RTO (Independent System Operator / Regional Transmission Organization) — the entities that operate the grid and run wholesale electricity markets across large regions (e.g., PJM, CAISO, ERCOT in the US). Understanding which ISO/RTO a company sells into matters more in this sector than in most, since market rules vary significantly by region.
- PPA (Power Purchase Agreement) — a long-term contract where a buyer (a utility, or increasingly a corporation) agrees to purchase electricity from a generator at a set price, often the financing mechanism that makes a new renewable project viable in the first place.
- Utility structure — investor-owned utilities (IOUs), municipal utilities, and cooperatives all operate under different regulatory and incentive structures, which shapes who buys grid software and why.
Why it matters
Grid modernization is a major, fast-growing area within Climate SaaS precisely because this is the physical layer underneath most of the rest of the climate transition: interconnection-queue software, grid analytics, and VPP platforms all exist because the physical grid is straining to absorb intermittent renewable generation at the pace policy and subsidies (see Climate Policy & Economics) are pushing it to. It also connects directly to the Storage topic, since batteries are the primary technology solving the baseload/intermittent mismatch described above.